Publications


The ATLAS(3D) project - XXIX. The new look of early-type galaxies and surrounding fields disclosed by extremely deep optical images

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 446 (2015) 120-143

P-A Duc, J-C Cuillandre, E Karabal, M Cappellari, K Alatalo, L Blitz, F Bournaud, M Bureau, AF Crocker, RL Davies, TA Davis, PT de Zeeuw, E Emsellem, S Khochfar, D Krajnovic, H Kuntschner, RM McDermid, L Michel-Dansac, R Morganti, T Naab, T Oosterloo, S Paudel, M Sarzi, N Scott, P Serra, A-M Weijmans, LM Young


Fluctuation-dissipation relations for a plasma-kinetic Langevin equation

Journal of Plasma Physics 760 (2014)

A Kanekar, AA Schekochihin, WD Dorland, NF Loureiro

© Cambridge University Press 2014. A linearised kinetic equation describing electrostatic perturbations of a Maxwellian equilibrium in a weakly collisional plasma forced by a random source is considered. The problem is treated as a kinetic analogue of the Langevin equation and the corresponding fluctuation-dissipation relations are derived. The kinetic fluctuation-dissipation relation reduces to the standard fluid one in the regime where the Landau damping rate is small and the system has no real frequency; in this case the simplest possible Landau-fluid closure of the kinetic equation coincides with the standard Langevin equation. Phase mixing of density fluctuations and emergence of fine scales in velocity space is diagnosed as a constant flux of free energy in Hermite space; the fluctuation-dissipation relations for the perturbations of the distribution function are derived, in the form of a universal expression for the Hermite spectrum of the free energy. Finite-collisionality effects are included. This work is aimed at establishing the simplest fluctuation-dissipation relations for a kinetic plasma, clarifying the connection between Landau and Hermite-space formalisms, and setting a benchmark case for a study of phase mixing in turbulent plasmas.


REVIEW OF PARTICLE PHYSICS Particle Data Group

CHINESE PHYSICS C 38 (2014) ARTN 090001

KA Olive, K Agashe, C Amsler, M Antonelli, J-F Arguin, DM Asner, H Baer, HR Band, RM Barnett, T Basaglia, CW Bauer, JJ Beatty, VI Belousov, J Beringer, G Bernardi, S Bethke, H Bichsel, O Biebel, E Blucher, S Blusk, G Brooijmans, O Buchmueller, V Burkert, MA Bychkov, RN Cahn, M Carena, A Ceccucci, A Cerri, D Chakraborty, M-C Chen, RS Chivukula, K Copic, G Cowan, O Dahl, G D'Ambrosio, T Damour, D de Florian, A de Gouvea, T DeGrand, P de Jong, G Dissertori, BA Dobrescu, M Doser, M Drees, HK Dreiner, DA Edwards, S Eidelman, J Erler, VV Ezhela, W Fetscher, BD Fields, B Foster, A Freitas, TK Gaisser, H Gallagher, L Garren, H-J Gerber, G Gerbier, T Gershon, T Gherghetta, S Golwala, M Goodman, C Grab, AV Gritsan, C Grojean, DE Groom, M Grunewald, A Gurtu, T Gutsche, HE Haber, K Hagiwara, C Hanhart, S Hashimoto, Y Hayato, KG Hayes, M Heffner, B Heltsley, JJ Hernandez-Rey, K Hikasa, A Hoecker, J Holder, A Holtkamp, J Huston, JD Jackson, KF Johnson, T Junk, M Kado, D Karlen, UF Katz, SR Klein, E Klempt, RV Kowalewski, F Krauss, M Kreps, B Krusche, YV Kuyanov, Y Kwon, O Lahav, J Laiho, P Langacker, A Liddle, Z Ligeti, C-J Lin, TM Liss, L Littenberg, KS Lugovsky, SB Lugovsky, F Maltoni, T Mannel, AV Manohar, WJ Marciano, AD Martin, A Masoni, J Matthews, D Milstead, P Molaro, K Moenig, F Moortgat, MJ Mortonson, H Murayama, K Nakamura, M Narain, P Nason, S Navas, M Neubert, P Nevski, Y Nir, L Pape, J Parsons, C Patrignani, JA Peacock, M Pennington, ST Petcov, A Piepke, A Pomarol, A Quadt, S Raby, J Rademacker, G Raffelt, BN Ratcliff, P Richardson, A Ringwald, S Roesler, S Rolli, A Romaniouk, LJ Rosenberg, JL Rosner, G Rybka, CT Achrajda, Y Sakai, GP Salam, S Sarkar, F Sauli, O Schneider, K Scholberg, D Scott, V Sharma, SR Sharpe, M Silari, T Sjostrand, P Skands, JG Smith, GF Smoot, S Spanier, H Spieler, C Spiering, A Stah, T Stanev, SL Stone, T Sumiyoshi, MJ Sphers, F Takahashi, M Tanabashi, J Terning, L Tiator, M Titov, NP Tkachenko, NA Tornqvist, D Tovey, G Valencia, G Venanzoni, MG Vincter, P Vogel, A Vogt, SP Wakely, W Walkowiak, CW Walter, DR Ward, G Weiglein, DH Weinberg, EJ Weinberg, M White, LR Wiencke, CC Woh, L Wofenstein, J Womersley, CL Woody, RL Workman, A Yamamoto, W-M Yao, GP Zeller, OV Zenin, J Zhang, R-Y Zhu, F Zimmermann, PA Zyla, G Harper, VS Lugovsky, P Schaffner, PD Grp


Erratum: IceCube sensitivity for low-energy neutrinos from nearby supernovae(Astronomy and Astrophysics (2011) 535 : A109 (DOI: 10.1051/0004-6361/201117810))

Astronomy and Astrophysics 563 (2014)

RU Abbasi, Y Abdou, T Abu-Zayyad, M Ackermann, JH Adams, JA Aguilar, M Ahlers, MM Allen, D Altmann, KG Andeen, J Auffenberg, X Bai, MD Baker, SW Barwick, VC Baum, R Bay, JL Bazo Alba, K Beattie, JJ Beatty, S Bechet, JK Becker, KH Becker, ML Benabderrahmane, SY Benzvi, J Berdermann, P Berghaus, D Berley, E Bernardini, D Bertrand, DZ Besson, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, D Bose, S Böser, O Botner, AM Brown, S Buitink, KS Caballero-Mora, MJ Carson, D Chirkin, B Christy, F Clevermann, SJ Cohen, C Colnard, DF Cowen, AH Cruz Silva, MV D'Agostino, M Danninger, JD Daughhetee, JCS Davis, C De Clercq, T Degner, L Demirörs, F Descamps, P Desiati, G De Vries-Uiterweerd, TR Deyoung, JC Díaz-Vélez, M Dierckxsens, J Dreyer, JP Dumm, M Dunkman, J Eisch, RW Ellsworth, O Engdegård, S Euler, PA Evenson, OO Fadiran, AR Fazely, A Fedynitch, J Feintzeig, T Feusels, KV Filimonov, CB Finley, T Fischer-Wasels, BD Fox, A Franckowiak, R Franke, TK Gaisser, JS Gallagher, L Gerhardt, LE Gladstone, T Glüsenkamp, A Goldschmidt, JA Goodman, D Góra, DR Grant, T Griesel, A Groß, S Grullon, M Gurtner, C Ha, A Hajismail, A Hallgren, F Halzen, K Han, KD Hanson, D Heinen, K Helbing, R Hellauer, S Hickford, GC Hill, KD Hoffman, B Hoffmann, A Homeier, K Hoshina, W Huelsnitz, JP Hülß, PO Hulth, K Hultqvist, SS Hussain, A Ishihara, E Jakobi, JE Jacobsen, GS Japaridze, HAB Johansson, KH Kampert, A Kappes, T Karg, A Karle, PJ Kenny, J Kiryluk, F Kislat, SR Klein, H Köhne, G Kohnen, HF Kolanoski, L Köpke, S Kopper, DJ Koskinen, M Kowalski, T Kowarik, M Krasberg, G Kroll, N Kurahashi, T Kuwabara, M Labare, K Laïhem, H Landsman, MJ Larson, RJ Lauer, J Lünemann, JR Madsen, A Marotta, R Maruyama, K Mase, HS Matis, K Meagher, M Merck, PI Mészáros, T Meures, S Miarecki, E Middell, N Milke, JL Miller, T Montaruli, RM Morse, SM Movit, R Nahnhauer, J Nam, U Naumann, DR Nygren, S Odrowski, A Olivas, M Olivo, A O'Murchadha, S Panknin, L Paul, CP De Los Heros, J Petrovic, A Piegsa, D Pieloth, R Porrata, J Posselt, PB Price, GT Przybylski, K Rawlins, P Redl, E Resconi, W Rhode, M Ribordy, AS Richard, MS Richman, JP Rodrigues, F Rothmaier, C Rott, T Ruhe, D Rutledge, B Ruzybayev, D Ryckbosch, HG Sander, M Santander, S Sarkar, K Schatto, T Schmidt, A Schönwald, A Schukraft, L Schulte, A Schultes, OH Schulz, M Schunck, D Seckel, B Semburg, S Seo, Y Sestayo, S Seunarine, A Silvestri, KK Singh, A Slipak, GM Spiczak, CH Spiering, M Stamatikos, TS Stanev, T Stezelberger, RG Stokstad, A Stößl, EA Strahler, RG Ström, M Stüer, GW Sullivan, Q Swillens, H Taavola, I Taboada, A Tamburro, A Tepe, SV Ter-Antonyan, S Tilav, PA Toale, S Toscano, D Tosi, NJAM Van Eijndhoven, JA Vandenbroucke, A Van Overloop, J Van Santen, M Vehring, M Voge, C Walck, T Waldenmaier, M Wallraff, M Walter, CH Weaver, CH Wendt, S Westerhoff, N Whitehorn, K Wiebe, CH Wiebusch, DR Williams, RP Wischnewski, H Wissing, MW Wolf, TR Wood, K Woschnagg, C Xu, D Xu, X Xu, JP Yáñez, GB Yodh, S Yoshida, P Zarzhitsky, MCR Zoll


Compact laser accelerators for X-ray phase-contrast imaging

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372 (2014)

Z Najmudin, S Kneip, MS Bloom, SPD Mangles, OV Chekhlov, AE Dangor, A Döpp, KG Ertel, SJ Hawkes, J Holloway, CJ Hooker, J Jiang, NC Lopes, H Nakamura, PA Norreys, PP Rajeev, C Russo, MJV Streeter, DR Symes, M Wing

Advances in X-ray imaging techniques have been driven by advances in novel X-ray sources. The latest fourth-generation X-ray sources can boast large photon fluxes at unprecedented brightness. However, the large size of these facilities means that these sources are not available for everyday applications. With advances in laser plasma acceleration, electron beams can now be generated at energies comparable to those used in light sources, but in university-sized laboratories. By making use of the strong transverse focusing of plasma accelerators, bright sources of betatron radiation have been produced. Here, we demonstrate phase-contrast imaging of a biological sample for the first time by radiation generated by GeV electron beams produced by a laser accelerator. The work was performed using a greater than 300TW laser, which allowed the energy of the synchrotron source to be extended to the 10100 keV range. © 2014 The Author(s) Published by the Royal Society. All rights reserved.


The Gaia-ESO Survey: processing FLAMES-UVES spectra

ASTRONOMY & ASTROPHYSICS 565 (2014) ARTN A113

GG Sacco, L Morbidelli, E Franciosini, E Majorca, S Randich, A Modigliani, G Gilmore, M Asplund, J Binney, P Bordfacio, J Drew, S Feltzing, A Ferguson, R Jeffries, G Micela, I Negueruela, T Prusti, H-W Rix, A Vallenari, E Alfaro, CA Prieto, C Babusiaux, T Bensby, R Blomme, A Bragaglia, E Flaccomio, P Francois, N Hambly, M Irwin, S Koposov, A Korn, A Lanzafame, F Pancino, A Recio-Blanco, R Smiljanic, S Van Eck, N Walton, M Bergemann, MT Costado, P de Laverny, U Heiter, V Hill, A Hourihane, R Jackson, P Jofre, J Lewis, K Lind, C Lardo, L Magrini, T Masseron, L Prisinzano, C Worley


The effect of diamagnetic flows on turbulent driven ion toroidal rotation

PHYSICS OF PLASMAS 21 (2014) ARTN 056106

JP Lee, M Barnes, FI Parra, EA Belli, J Candy


The ATLAS(3D) project - XXIV. The intrinsic shape distribution of early-type galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444 (2014) 3340-3356

A-M Weijmans, PT de Zeeuw, E Emsellem, D Krajnovic, P-Y Lablanche, K Alatalo, L Blitz, M Bois, F Bournaud, M Bureau, M Cappellari, AF Crocker, RL Davies, TA Davis, P-A Duc, S Khochfar, H Kuntschner, RM McDermid, R Morganti, T Naab, T Oosterloo, M Sarzi, N Scott, P Serra, GV Kleijn, LM Young


Electron-ion equilibration in ultrafast heated graphite.

Physical review letters 112 (2014) 145005-

TG White, NJ Hartley, B Borm, BJ Crowley, JW Harris, DC Hochhaus, T Kaempfer, K Li, P Neumayer, LK Pattison, F Pfeifer, S Richardson, AP Robinson, I Uschmann, G Gregori

We have employed fast electrons produced by intense laser illumination to isochorically heat thermal electrons in solid density carbon to temperatures of ∼10,000  K. Using time-resolved x-ray diffraction, the temperature evolution of the lattice ions is obtained through the Debye-Waller effect, and this directly relates to the electron-ion equilibration rate. This is shown to be considerably lower than predicted from ideal plasma models. We attribute this to strong ion coupling screening the electron-ion interaction.


The RAVE survey: the Galactic escape speed and the mass of the Milky Way

ASTRONOMY & ASTROPHYSICS 562 (2014) ARTN A91

T Piffl, C Scannapieco, J Binney, M Steinmetz, R-D Scholz, MEK Williams, RS de Jong, G Kordopatis, G Matijevic, O Bienayme, J Bland-Hawthorn, C Boeche, K Freeman, B Gibson, G Gilmore, EK Grebel, A Helmi, U Munari, JF Navarro, Q Parker, WA Reid, G Seabroke, F Watson, RFG Wyse, T Zwitter


Characterisation of deuterium spectra from laser driven multi-species sources by employing differentially filtered image plate detectors in Thomson spectrometers.

The Review of scientific instruments 85 (2014) 093303-

A Alejo, S Kar, H Ahmed, AG Krygier, D Doria, R Clarke, J Fernandez, RR Freeman, J Fuchs, A Green, JS Green, D Jung, A Kleinschmidt, CL Lewis, JT Morrison, Z Najmudin, H Nakamura, G Nersisyan, P Norreys, M Notley, M Oliver, M Roth, JA Ruiz, L Vassura, M Zepf, M Borghesi

A novel method for characterising the full spectrum of deuteron ions emitted by laser driven multi-species ion sources is discussed. The procedure is based on using differential filtering over the detector of a Thompson parabola ion spectrometer, which enables discrimination of deuterium ions from heavier ion species with the same charge-to-mass ratio (such as C(6+), O(8+), etc.). Commonly used Fuji Image plates were used as detectors in the spectrometer, whose absolute response to deuterium ions over a wide range of energies was calibrated by using slotted CR-39 nuclear track detectors. A typical deuterium ion spectrum diagnosed in a recent experimental campaign is presented, which was produced from a thin deuterated plastic foil target irradiated by a high power laser.


Equivalence of two different approaches to global gyrokinetic simulations

ArXiv (2014)

FI Parra, M Barnes

A set of flux tube gyrokinetic equations that includes the effect of the spatial variation of the density, temperature and rotation gradients on the turbulence is derived. This new set of equations uses statistical periodicity as a boundary condition, avoiding the need to impose non-physical boundary conditions. This new approach to global gyrokinetic simulations is shown to be equivalent to the traditional global $\delta f$ gyrokinetic equations when the turbulent eddies are smaller than the characteristic size of the machine.


Search for a diffuse flux of astrophysical muon neutrinos with the IceCube 59-string configuration

Physical Review D - Particles, Fields, Gravitation and Cosmology 89 (2014)

MG Aartsen, RU Abbasi, M Ackermann, JH Adams, JA Aguilar, M Ahlers, D Altmann, CA Argüelles, TC Arlen, J Auffenberg, X Bai, MD Baker, SW Barwick, VC Baum, R Bay, JJ Beatty, J Becker Tjus, KH Becker, SY Benzvi, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, D Bose, S Böser, O Botner, L Brayeur, HP Bretz, AM Brown, RHC Bruijn, JA Casey, M Casier, D Chirkin, A Christov, B Christy, K Clark, L Classen, F Clevermann, S Coenders, SJ Cohen, DF Cowen, AH Cruz Silva, M Danninger, JD Daughhetee, JCS Davis, MH Day, JPAM De André, C De Clercq, S De Ridder, P Desiati, KD De Vries, M De With, TR Deyoung, JC Díaz-Vélez, M Dunkman, R Eagan, B Eberhardt, B Eichmann, J Eisch, S Euler, PA Evenson, OO Fadiran, AR Fazely, A Fedynitch, J Feintzeig, T Feusels, KV Filimonov, CB Finley, T Fischer-Wasels, S Flis, A Franckowiak, K Frantzen, TOJ Fuchs, TK Gaisser, JS Gallagher, L Gerhardt, LE Gladstone, T Glüsenkamp, A Goldschmidt, GT Golup, JG González, JA Goodman, D Góra, DT Grandmont, DR Grant, P Gretskov, JC Groh, A Groß, C Ha, A Haj Ismail, P Hallen, A Hallgren, F Halzen, KD Hanson, D Hebecker, D Heereman, D Heinen, K Helbing, R Hellauer, S Hickford, GC Hill, KD Hoffman, R Hoffmann, A Homeier, K Hoshina, F Huang, W Huelsnitz, PO Hulth, K Hultqvist, SS Hussain, A Ishihara, E Jacobi, JE Jacobsen, K Jagielski, GS Japaridze, K Jero, O Jlelati, B Kaminsky, A Kappes, T Karg, A Karle, M Kauer, JL Kelley, J Kiryluk, J Kläs, SR Klein, JH Köhne, G Kohnen, HF Kolanoski, L Köpke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, M Krasberg, A Kriesten, K Krings, G Kroll, J Kunnen, N Kurahashi, T Kuwabara, M Labare, H Landsman, MJ Larson, M Lesiak-Bzdak, M Leuermann, J Leute, J Lünemann, O Macías, JR Madsen, GP Maggi, R Maruyama, K Mase, HS Matis, F McNally, K Meagher, M Merck, T Meures, S Miarecki, E Middell, N Milke, JL Miller, L Mohrmann, T Montaruli, RM Morse, R Nahnhauer, U Naumann, H Niederhausen, SC Nowicki, DR Nygren, A Obertacke, S Odrowski, A Olivas, A Omairat, A O'Murchadha, TJ Palczewski, L Paul, JA Pepper, C Pérez De Los Heros, CG Pfendner, D Pieloth, E Pinat, J Posselt, PB Price, GT Przybylski, M Quinnan, L Rädel, M Rameez, K Rawlins, P Redl, R Reimann, E Resconi, W Rhode, M Ribordy, MS Richman, BJCJ Riedel, SH Robertson, JP Rodrigues, C Rott, T Ruhe, B Ruzybayev, D Ryckbosch, SM Saba, HG Sander, M Santander, S Sarkar, K Schatto, F Scheriau, T Schmidt, M Schmitz, S Schoenen, S Schöneberg, A Schönwald, A Schukraft, L Schulte, O Schulz, D Seckel, Y Sestayo, S Seunarine, RG Shanidze, C Sheremata, MWE Smith, D Soldin, GM Spiczak, CH Spiering, M Stamatikos, TS Stanev, NA Stanisha, A Stasik, T Stezelberger, RG Stokstad, A Stößl, EA Strahler, RG Ström, NL Strotjohann, GW Sullivan, H Taavola, I Taboada, A Tamburro, A Tepe, SV Ter-Antonyan, G Tešić, S Tilav, PA Toale, MN Tobin, S Toscano, M Tselengidou, E Unger, M Usner, S Vallecorsa, NJAM Van Eijndhoven, A Van Overloop, J Van Santen, M Vehring, M Voge, M Vraeghe, C Walck, T Waldenmaier, M Wallraff, CH Weaver, MT Wellons, CH Wendt, S Westerhoff, BJ Whelan, N Whitehorn, K Wiebe, CH Wiebusch, DR Williams, H Wissing, MW Wolf, TR Wood, K Woschnagg, D Xu, X Xu, JP Yáñez, GB Yodh, S Yoshida, P Zarzhitsky, J Ziemann, S Zierke, MCR Zoll

A search for high-energy neutrinos was performed using data collected by the IceCube Neutrino Observatory from May 2009 to May 2010, when the array was running in its 59-string configuration. The data sample was optimized to contain muon neutrino induced events with a background contamination of atmospheric muons of less than 1%. These data, which are dominated by atmospheric neutrinos, are analyzed with a global likelihood fit to search for possible contributions of prompt atmospheric and astrophysical neutrinos, neither of which have yet been identified. Such signals are expected to follow a harder energy spectrum than conventional atmospheric neutrinos. In addition, the zenith angle distribution differs for astrophysical and atmospheric signals. A global fit of the reconstructed energies and directions of observed events is performed, including possible neutrino flux contributions for an astrophysical signal and atmospheric backgrounds as well as systematic uncertainties of the experiment and theoretical predictions. The best fit yields an astrophysical signal flux for νμ+ν̄μ of E2·Φ(E)=0.25×10-8GeVcm-2s-1sr-1, and a zero prompt component. Although the sensitivity of this analysis for astrophysical neutrinos surpasses the Waxman and Bahcall upper bound, the experimental limit at 90% confidence level is a factor of 1.5 above at a flux of E2·Φ(E)=1.44×10-8GeVcm-2s-1sr-1. © 2014 American Physical Society.


Reconstruction of the primordial power spectrum of curvature perturbations using multiple data sets

ArXiv (2013)

P Hunt, S Sarkar

Detailed knowledge of the primordial power spectrum of curvature perturbations is essential both in order to elucidate the physical mechanism (`inflation') which generated it, and for estimating the cosmological parameters from observations of the cosmic microwave background and large-scale structure. Hence it ought to be extracted from such data in a model-independent manner, however this is difficult because relevant cosmological observables are given by a convolution of the primordial perturbations with some smoothing kernel which depends on both the assumed world model and the matter content of the universe. Moreover the deconvolution problem is ill-conditioned so a regularisation scheme must be employed to control error propagation. We demonstrate that `Tikhonov regularisation' can robustly reconstruct the primordial spectrum from multiple cosmological data sets, a significant advantage being that both its uncertainty and resolution are then quantified. Using Monte Carlo simulations we investigate several regularisation parameter selection methods and find that generalised cross-validation and Mallow's $C_p$ method give optimal results. We apply our inversion procedure to data from the Wilkinson Microwave Anisotropy Probe, other ground-based small angular scale CMB experiments, and the Sloan Digital Sky Survey. The reconstructed spectrum (assuming the standard $\Lambda$CDM cosmology) is \emph{not} scale-free but has an infrared cutoff at $k \lesssim 5 \times 10^{-4}\; \mathrm{Mpc}^{-1}$ (due to the anomalously low CMB quadrupole) and several features with $\sim 2 \sigma$ significance at $k/\mathrm{Mpc}^{-1} \sim$ 0.0013--0.0025, 0.0362--0.0402 and 0.051--0.056, reflecting the `WMAP glitches'. To test whether these are indeed real will require more accurate data, such as from the Planck satellite and new ground-based experiments.


The second data release of the INT Photometric Ha Survey of the Northern Galactic Plane (IPHAS DR2)

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444 (2014) 3230-3257

G Barentsen, HJ Farnhill, JE Drew, EA Gonzalez-Solares, R Greimel, MJ Irwin, B Miszalski, C Ruhland, P Groot, A Mampaso, SE Sale, AA Henden, A Aungwerojwit, MJ Barlow, PJ Carter, RLM Corradi, JJ Drake, J Eisloeffel, J Fabregat, BT Gaensicke, NPG Fusillo, S Greiss, AS Hales, S Hodgkin, L Huckvale, J Irwin, R King, C Knigge, T Kupfer, E Lagadec, DJ Lennon, JR Lewis, M Mohr-Smith, RAH Morris, T Naylor, QA Parker, S Phillipps, S Pyrzas, R Raddi, GHA Roelofs, P Rodriguez-Gil, L Sabin, S Scaringi, D Steeghs, J Suso, R Tata, YC Unruh, J van Roestel, K Viironen, JS Vink, NA Walton, NJ Wright, AA Zijlstra


Three-dimensional extinction mapping using Gaussian random fields

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 445 (2014) 256-269

SE Sale, J Magorrian


The unbearable lightness of being: CDMS versus XENON

ArXiv (2013)

MT Frandsen, F Kahlhoefer, C McCabe, S Sarkar, K Schmidt-Hoberg

The CDMS-II collaboration has reported 3 events in a Si detector, which are consistent with being nuclear recoils due to scattering of Galactic dark matter particles with a mass of about 8.6 GeV and a cross-section on neutrons of about 2 x 10^-41 cm^2. While a previous result from the XENON10 experiment has supposedly ruled out such particles as dark matter, we find by reanalysing the XENON10 data that this is not the case. Some tension remains however with the upper limit placed by the XENON100 experiment, independently of astrophysical uncertainties concerning the Galactic dark matter distribution. We explore possible ways of ameliorating this tension by altering the properties of dark matter interactions. Nevertheless, even with standard couplings, light dark matter is consistent with both CDMS and XENON10/100.


First results of an H alpha based search of classical Be stars in the Perseus Arm and beyond

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 430 (2013) 2169-2187

R Raddi, JE Drew, J Fabregat, D Steeghs, NJ Wright, SE Sale, HJ Farnhill, MJ Barlow, R Greimel, L Sabin, RML Corradi, JJ Drake


Fast and slow rotators in the densest environments: a FLAMES/GIRAFFE IFS study of galaxies in Abell 1689 at z=0.183

ArXiv (2012)

F D'Eugenio, RCW Houghton, RL Davies, ED Bontà

We present FLAMES/GIRAFFE integral field spectroscopy of 30 galaxies in the massive cluster Abell 1689 at z = 0.183. Conducting an analysis similar to that of ATLAS3D, we extend the baseline of the kinematic morphology-density relation by an order of magnitude in projected density and show that it is possible to use existing instruments to identify slow and fast rotators beyond the local Universe. We find 4.5 +- 1.0 slow rotators with a distribution in magnitude similar to those in the Virgo cluster. The overall slow rotator fraction of our Abell 1689 sample is 0.15 +- 0.03, the same as in Virgo using our selection criteria. This suggests that the fraction of slow rotators in a cluster is not strongly dependent on its density. However, within Abell 1689, we find that the fraction of slow rotators increases towards the centre, as was also found in the Virgo cluster.


An improved method for measuring muon energy using the truncated mean of dE/dx

ArXiv (2012)

I collaboration, R Abbasi, Y Abdou, M Ackermann, J Adams, JA Aguilar, M Ahlers, D Altmann, K Andeen, J Auffenberg, X Bai, M Baker, SW Barwick, V Baum, R Bay, K Beattie, JJ Beatty, S Bechet, JB Tjus, K-H Becker, M Bell, ML Benabderrahmane, S BenZvi, J Berdermann, P Berghaus, D Berley, E Bernardini, D Bertrand, DZ Besson, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, D Bose, S Böser, O Botner, L Brayeur, AM Brown, R Bruijn, J Brunner, S Buitink, M Carson, J Casey, M Casier, D Chirkin, B Christy, F Clevermann, S Cohen, DF Cowen, AHC Silva, M Danninger, J Daughhetee, JC Davis, CD Clercq, F Descamps, P Desiati, GD Vries-Uiterweerd, T DeYoung, JC Díaz-Vélez, J Dreyer, JP Dumm, M Dunkman, R Eagan, J Eisch, C Elliott, RW Ellsworth, O Engdegård, S Euler, PA Evenson, O Fadiran, AR Fazely, A Fedynitch, J Feintzeig, T Feusels, K Filimonov, C Finley, T Fischer-Wasels, S Flis, A Franckowiak, R Franke, K Frantzen, T Fuchs, TK Gaisser, J Gallagher, L Gerhardt, L Gladstone, T Glüsenkamp, A Goldschmidt, JA Goodman, D Góra, D Grant, A Groß, S Grullon, M Gurtner, C Ha, AH Ismail, A Hallgren, F Halzen, K Hanson, D Heereman, P Heimann, D Heinen, K Helbing, R Hellauer, S Hickford, GC Hill, KD Hoffman, R Hoffmann, A Homeier, K Hoshina, W Huelsnitz, PO Hulth, K Hultqvist, S Hussain, A Ishihara, E Jacobi, J Jacobsen, GS Japaridze, O Jlelati, A Kappes, T Karg, A Karle, J Kiryluk, F Kislat, J Kläs, SR Klein, S Klepser, J-H Köhne, G Kohnen, H Kolanoski, L Köpke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, M Krasberg, G Kroll, J Kunnen, N Kurahashi, T Kuwabara, M Labare, K Laihem, H Landsman, MJ Larson, R Lauer, M Lesiak-Bzdak, J Lünemann, J Madsen, R Maruyama, K Mase, HS Matis, A McDermott, F McNally, K Meagher, M Merck, P Mészáros, T Meures, S Miarecki, E Middell, N Milke, J Miller, L Mohrmann, T Montaruli, R Morse, SM Movit, R Nahnhauer, U Naumann, P Nießen, SC Nowicki, DR Nygren, A Obertacke, S Odrowski, A Olivas, M Olivo, A O'Murchadha, S Panknin, L Paul, JA Pepper, CPDL Heros, D Pieloth, N Pirk, J Posselt, PB Price, GT Przybylski, L Rädel, K Rawlins, P Redl, E Resconi, W Rhode, M Ribordy, M Richman, B Riedel, JP Rodrigues, J Roth, F Rothmaier, C Rott, C Roucelle, T Ruhe, B Ruzybayev, D Ryckbosch, SM Saba, T Salameh, H-G Sander, M Santander, S Sarkar, K Schatto, M Scheel, F Scheriau, T Schmidt, M Schmitz, S Schoenen, S Schöneberg, L Schönherr, A Schönwald, A Schukraft, L Schulte, O Schulz, D Seckel, SH Seo, Y Sestayo, S Seunarine, L Shulman, MWE Smith, M Soiron, D Soldin, GM Spiczak, C Spiering, M Stamatikos, T Stanev, A Stasik, T Stezelberger, RG Stokstad, A Stößl, S Stoyanov, EA Strahler, R Ström, K-H Sulanke, GW Sullivan, H Taavola, I Taboada, A Tamburro, S Ter-Antonyan, S Tilav, PA Toale, S Toscano, M Usner, DVD Drift, NV Eijndhoven, AV Overloop, JV Santen, M Vehring, M Voge, C Walck, T Waldenmaier, M Wallraff, M Walter, R Wasserman, C Weaver, C Wendt, S Westerhoff, N Whitehorn, K Wiebe, CH Wiebusch, DR Williams, H Wissing, M Wolf, TR Wood, K Woschnagg, C Xu, DL Xu, XW Xu, JP Yanez, G Yodh, S Yoshida, P Zarzhitsky, J Ziemann, A Zilles, M Zoll

The measurement of muon energy is critical for many analyses in large Cherenkov detectors, particularly those that involve separating extraterrestrial neutrinos from the atmospheric neutrino background. Muon energy has traditionally been determined by measuring the specific energy loss (dE/dx) along the muon's path and relating the dE/dx to the muon energy. Because high-energy muons (E_mu > 1 TeV) lose energy randomly, the spread in dE/dx values is quite large, leading to a typical energy resolution of 0.29 in log10(E_mu) for a muon observed over a 1 km path length in the IceCube detector. In this paper, we present an improved method that uses a truncated mean and other techniques to determine the muon energy. The muon track is divided into separate segments with individual dE/dx values. The elimination of segments with the highest dE/dx results in an overall dE/dx that is more closely correlated to the muon energy. This method results in an energy resolution of 0.22 in log10(E_mu), which gives a 26% improvement. This technique is applicable to any large water or ice detector and potentially to large scintillator or liquid argon detectors.