Publications


Identifying the progenitors of present-day early-type galaxies in observational surveys: Correcting 'progenitor bias' using the Horizon-AGN simulation

Monthly Notices of the Royal Astronomical Society 474 (2018) 3140-3151

G Martin, S Kaviraj, JEG Devriendt, Y Dubois, C Pichon, C Laigle

© 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. As endpoints of the hierarchical mass-assembly process, the stellar populations of local earlytype galaxies encode the assembly history of galaxies over cosmic time. We useHorizon-AGN, a cosmological hydrodynamical simulation, to study the merger histories of local early-type galaxies and track how the morphological mix of their progenitors evolves over time. We provide a framework for alleviating 'progenitor bias' - the bias that occurs if one uses only early-type galaxies to study the progenitor population. Early types attain their final morphology at relatively early epochs - by z ~ 1, around 60 per cent of today's early types have had their last significant merger. At all redshifts, the majority of mergers have one late-type progenitor, with late-late mergers dominating at z > 1.5 and early-early mergers becoming significant only at z < 0.5. Progenitor bias is severe at all but the lowest redshifts - e.g. at z~0.6, less than 50 per cent of the stellar mass in today's early types is actually in progenitors with early-type morphology, while, at z~ 2, studying only early types misses almost all (80 per cent) of the stellar mass that eventually ends up in local early-type systems. At high redshift, almost all massive late-type galaxies, regardless of their local environment or star formation rate, are progenitors of local early-type galaxies, as are lowermass (M* < 10 10.5 M ⊙ ) late-types as long as they reside in high-density environments. In this new era of large observational surveys (e.g. LSST, JWST), this study provides a framework for studying how today's early-type galaxies have been built up over cosmic time.


A Compact Quad-Ridge Orthogonal Mode Transducer with Wide Operational Bandwidth

IEEE Antennas and Wireless Propagation Letters (2018)

AW Pollak, ME Jones

IEEE We present the design and the measured performance of a compact quad-ridge orthomode transducer (OMT) operating in C-band with more than 100% fractional bandwidth. The OMT comprises two sets of identical orthogonal ridges mounted in a circular waveguide. The profile of these ridges was optimised to reduce significantly the transition length, while retaining the wide operational bandwidth of the quad-ridge OMT. In this letter, we show that the optimised compact OMT has better than -15dB return loss with the cross-polarisation well below -40dB in the designated 4.0-8.5GHz band.


The new galaxy evolution paradigm revealed by the Herschel surveys

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473 (2018) 3507-3524

S Eales, D Smith, N Bourne, J Loveday, K Rowlands, P van der Werf, S Driver, L Dunne, S Dye, C Furlanetto, RJ Ivison, S Maddox, A Robotham, MWL Smith, EN Taylor, E Valiante, A Wright, P Cigan, G De Zotti, MJ Jarvis, L Marchetti, MJ Michalowski, S Phillipps, S Viaene, C Vlahakis


Gas flows in the circumgalactic medium around simulated high-redshift galaxies

Monthly Notices of the Royal Astronomical Society 474 (2018) 4279-4301

PD Mitchell, J Blaizot, J Devriendt, T Kimm, L Michel-Dansac, J Rosdahl, A Slyz

© 2017 The Author(s). We analyse the properties of circumgalactic gas around simulated galaxies in the redshift range z ≥ 3, utilizing a new sample of cosmological zoom simulations. These simulations are intended to be representative of the observed samples of Lyman α (Ly α) emitters recently obtained with the multi unit spectroscopic explorer (MUSE) instrument (halo masses ~ 10 10 - 10 11 M⊙). We show that supernova feedback has a significant impact on both the inflowing and outflowing circumgalactic medium (CGM) by driving outflows, reducing diffuse inflow rates, and by increasing the neutral fraction of inflowing gas. By temporally stacking simulation outputs, we find that significant net mass exchange occurs between inflowing and outflowing phases: none of the phases are mass-conserving. In particular, we find that the mass in neutral outflowing hydrogen declines exponentially with radius as gas flows outwards from the halo centre. This is likely caused by a combination of both fountain-like cycling processes and gradual photoionization/collisional ionization of outflowing gas. Our simulations do not predict the presence of fast-moving neutral outflows in the CGM. Neutral outflows instead move with modest radial velocities (~ 50 km s -1 ), and the majority of the kinetic energy is associated with tangential rather than radial motion.


Impact of relativistic effects on cosmological parameter estimation

PHYSICAL REVIEW D 97 (2018) ARTN 023537

CS Lorenz, D Alonso, PG Ferreira


Photometric redshifts for the next generation of deep radio continuum surveys - I. Template fitting

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473 (2018) 2655-2672

KJ Duncan, MJI Brown, WL Williams, PN Best, V Buat, D Burgarella, MJ Jarvis, K Malek, SJ Oliver, HJA Rottgering, DJB Smith


The clustering and bias of radio-selected AGN and star-forming galaxies in the COSMOS field

Monthly Notices of the Royal Astronomical Society 474 (2018) 4133-4150

CL Hale, MJ Jarvis, I Delvecchio, PW Hatfield, M Novak, V Smolčić, G Zamorani

© 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. Dark matter haloes in which galaxies reside are likely to have a significant impact on their evolution. We investigate the link between dark matter haloes and their constituent galaxies by measuring the angular two-point correlation function of radio sources, using recently released 3 GHz imaging over~2 deg2 of the Cosmological Evolution Survey (COSMOS) field. We split the radio source population into star-forming galaxies (SFGs) and active galactic nuclei (AGN), and further separate the AGN into radiatively efficient and inefficient accreters. Restricting our analysis to z < 1, we find SFGs have a bias, b = 1.5 -0.2 +0.1 , at a median redshift of z = 0.62. On the other hand, AGN are significantly more strongly clustered with b = 2.1 ± 0.2 at a median redshift of 0.7. This supports the idea that AGN are hosted by more massive haloes than SFGs. We also find low accretion rate AGN are more clustered (b = 2.9 ± 0.3) than high accretion rate AGN (b = 1.8 -0.5 +0.4 ) at the same redshift (z ~ 0.7), suggesting that low accretion rate AGN reside in higher mass haloes. This supports previous evidence that the relatively hot gas that inhabits the most massive haloes is unable to be easily accreted by the central AGN, causing them to be inefficient. We also find evidence that low accretion rate AGN appear to reside in halo masses of M h ~ 3-4 × 10 13 h -1 M⊙ at all redshifts. On the other hand, the efficient accreters reside in haloes of M h ~1-2×10 13 h -1 M⊙ at low redshift but can reside in relatively lower mass haloes at higher redshifts. This could be due to the increased prevalence of cold gas in lower mass haloes at z ≥ 1 compared to z < 1.


Improving photometric redshift estimation using GPZ: Size information, post processing, and improved photometry

Monthly Notices of the Royal Astronomical Society 475 (2018) 331-342

Z Gomes, MJ Jarvis, IA Almosallam, SJ Roberts

© 2017 The Author(s). The next generation of large-scale imaging surveys (such as those conducted with the Large Synoptic Survey Telescope and Euclid) will require accurate photometric redshifts in order to optimally extract cosmological information. Gaussian Process for photometric redshift estimation (GPZ) is a promising new method that has been proven to provide efficient, accurate photometric redshift estimations with reliable variance predictions. In this paper,we investigate a number of methods for improving the photometric redshift estimations obtained using GPZ (but which are also applicable to others). We use spectroscopy from the Galaxy and Mass Assembly Data Release 2 with a limiting magnitude of r < 19.4 along with corresponding Sloan Digital Sky Survey visible (ugriz) photometry and the UKIRT Infrared Deep Sky Survey Large Area Survey near-IR (YJHK) photometry. We evaluate the effects of adding near-IR magnitudes and angular size as features for the training, validation, and testing of GPZ and find that these improve the accuracy of the results by ~15-20 per cent. In addition, we explore a post-processing method of shifting the probability distributions of the estimated redshifts based on their Quantile-Quantile plots and find that it improves the bias by ~40 per cent. Final ly, we investigate the effects of using more precise photometry obtained from the Hyper Suprime-Cam Subaru Strategic Program Data Release 1 and find that it produces significant improvements in accuracy, similar to the effect of including additional features.


Comparison of Einstein-Boltzmann solvers for testing general relativity

PHYSICAL REVIEW D 97 (2018) ARTN 023520

E Bellini, A Barreira, N Frusciante, B Hu, S Peirone, M Raveri, M Zumalacarregui, A Avilez-Lopez, M Ballardini, RA Battye, B Bolliet, E Calabrese, Y Dirian, PG Ferreira, F Finelli, Z Huang, MM Ivanov, J Lesgourgues, B Li, NA Lima, F Pace, D Paoletti, I Sawicki, A Silvestri, C Skordis, C Umilta, F Vernizzi


Multiwavelength follow-up of a rare IceCube neutrino multiplet

ASTRONOMY & ASTROPHYSICS 607 (2017) ARTN A115

MG Aartsen, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, I Al Samarai, D Altmann, K Andeen, T Anderson, I Ansseau, G Anton, M Archinger, C Arguelles, J Auffenberg, S Axani, X Bai, SW Barwick, V Baum, R Bay, JJ Beatty, JB Tjus, K-H Becker, S BenZvi, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, E Blaufuss, S Blot, C Bohm, M Boerner, F Bos, D Bose, S Boeser, O Botner, J Braun, L Brayeur, H-P Bretz, S Bron, A Burgman, T Carver, M Casier, E Cheung, D Chirkin, A Christov, K Clark, L Classen, S Coenders, GH Collin, JM Conrad, DF Cowen, R Cross, M Day, JPAM de Andre, C De Clercq, EDP Rosendo, H Dembinski, S De Ridder, P Desiati, KD de Vries, G de Wasseige, M de With, T DeYoung, V di Lorenzo, H Dujmovic, JP Dumm, M Dunkman, B Eberhardt, T Ehrhardt, B Eichmann, P Eller, S Euler, PA Evenson, S Fahey, AR Fazely, J Feintzeig, J Felde, K Filimonov, C Finley, S Flis, C-C Foesig, A Franckowiak, E Friedman, T Fuchs, TK Gaisser, J Gallagher, L Gerhardt, K Ghorbani, W Giang, L Gladstone, T Glauch, T Gluesekamp, A Goldschmidt, JG Gonzalez, D Grant, Z Griffith, C Haack, A Hallgren, F Halzen, E Hansen, T Hansmann, K Hanson, D Hebecker, D Heereman, K Helbing, R Hellauer, S Hickford, J Hignight, GC Hill, KD Hoffman, R Hoffmann, K Hoshina, F Huang, M Huber, K Hultqvist, S In, A Ishihara, E Jacobi, GS Japaridze, M Jeong, K Jero, BJP Jones, W Kang, A Kappes, T Karg, A Karle, U Katz, M Kauer, A Keivani, JL Kelley, A Kheirandish, J Kim, M Kim, T Kintscher, J Kiryluk, T Kittler, SR Klein, G Kohnen, R Koirala, H Kolanoski, R Konietz, L Koepke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, K Krings, M Kroll, G Krueckl, C Krueger, J Kunnen, S Kunwar, N Kurahashi, T Kuwabara, A Kyriacou, M Labare, JL Lanfranchi, MJ Larson, F Lauber, M Lesiak-Bzdak, M Leuermann, L Lu, J Luenemann, J Madsen, G Maggi, KBM Mahn, S Mancina, M Mandelartz, R Maruyama, K Mase, R Maunu, F McNally, K Meagher, M Medici, M Meier, T Menne, G Merino, T Meures, S Miarecki, J Micallef, G Momente, T Montaruli, M Moulai, R Nahnhauer, U Naumann, G Neer, H Niederhausen, SC Nowicki, DR Nygren, AO Pollmann, A Olivas, A O'Murchadha, T Palczewski, H Pandya, DV Pankova, P Peiffer, O Penek, JA Pepper, C Perez de los Heros, D Pieloth, E Pinat, PB Price, GT Przybylski, M Quinnan, C Raab, L Raedel, M Rameez, K Rawlins, R Reimann, B Relethford, M Relich, E Resconi, W Rhode, M Richman, B Riedel, S Robertson, M Rongen, C Rott, T Ruhe, D Ryckbosch, D Rysewyk, L Sabbatini, SES Herrera, A Sandrock, J Sandroos, S Sarkar, K Satalecka, P Schlunder, T Schmidt, S Schoenen, S Schoeneberg, L Schumacher, D Seckel, S Seunarine, D Soldin, M Song, GM Spiczak, C Spiering, J Stachurska, T Stanev, A Stasik, J Stettner, A Steuer, T Stezelberger, RG Stokstad, A Stoessl, R Stroem, NL Strotjohann, GW Sullivan, M Sutherland, H Taavola, I Taboada, J Tatar, F Tenholt, S Ter-Antonyan, A Terliuk, G Tesic, S Tilav, PA Toale, MN Tobin, S Toscano, D Tosi, M Tselengidou, CF Tung, A Turcati, E Unger, M Usner, J Vandenbroucke, N van Eijndhoven, S Vanheule, M van Rossem, J van Santen, M Vehring, M Voge, E Vogel, M Vraeghe, C Walck, A Wallace, M Wallraff, N Wandkowsky, A Waza, C Weaver, MJ Weiss, C Wendt, S Westerhoff, BJ Whelan, S Wickmann, K Wiebe, CH Wiebusch, L Wille, DR Williams, L Wills, M Wolf, TR Wood, E Woolsey, K Woschnagg, DL Xu, XW Xu, Y Xu, JP Yanez, G Yodh, S Yoshida, M Zoll, KZ Stanek, BJ Shappee, CS Kochanek, TW-S Holoien, JL Prieto, DB Fox, JJ DeLaunay, CF Turley, SD Barthelmy, AY Lien, P Meszaros, K Murase, D Kocevski, R Buehler, M Giomi, JL Racusin, A Albert, R Alfaro, C Alvarez, JD Alvarez, R Arceo, JC Arteaga-Velazquez, HAA Solares, AS Barber, N Baustista-Elivar, A Becerril, E Belmont-Moreno, A Bernal, C Brisbois, KS Caballero-Mora, T Capistran, A Carraminana, S Casanova, M Castillo, U Cotti, S Coutino de Leon, E de la Fuente, C De Leon, R Diaz Hernandez, JC Diaz-Velez, BL Dingus, MA DuVernois, RW Ellsworth, K Engel, DW Fiorino, N Fraija, JA Garcia-Gonzalez, M Gerhardt, A Gonzalez Munoz, MM Gonzalez, JA Goodman, Z Hampel-Arias, JP Harding, S Hernandez, CM Hui, P Huentemeyer, A Iriarte, A Jardin-Blicq, V Joshi, S Kaufmann, A Lara, RJ Lauer, WH Lee, D Lennarz, H Leon Vargas, JT Linnemann, G Luis Raya, R Luna-Garcia, R Lopez-Coto, K Malone, SS Marinelli, O Martinez, I Martinez-Castellanos, J Martinez-Castro, H Martinez-Huerta, JA Matthews, P Miranda-Romagnoli, E Moreno, M Mostafa, L Nellen, M Newbold, MU Nisa, R Noriega-Papaqui, R Pelayo, J Pretz, EG Perez-Perez, Z Ren, CD Rho, C Riviere, D Rosa-Gonzalez, M Rosenberg, FS Greus, A Sandoval, M Schneider, H Schoorlemmer, G Sinnis, AJ Smith, RW Springer, P Surajbali, O Tibolla, K Tollefson, I Torres, TN Ukwatta, L Villasenor, T Weisgarber, IG Wisher, J Wood, T Yapici, A Zepeda, H Zhou, I Arcavi, G Hosseinzadeh, DA Howell, S Valenti, C McCully, VM Lipunov, ES Gorbovskoy, NV Tiurina, PV Balanutsa, AS Kuznetsov, VG Kornilov, V Chazov, NM Budnev, OA Gress, KI Ivanov, AG Tlatov, RR Lopez, M Serra-Ricart, PA Evans, JA Kennea, N Gehrels, JP Osborne, KL Page, AU Abeysekara, A Archer, W Benbow, R Bird, T Brantseg, V Bugaev, JV Cardenzana, MP Connolly, W Cui, A Falcone, Q Feng, JP Finley, H Fleischhack, L Fortson, A Furniss, S Griffin, J Grube, M Huetten, O Hervet, J Holder, G Hughes, TB Humensky, CA Johnson, P Kaaret, P Kar, N Kelley-Hoskins, M Kertzman, M Krause, S Kumar, MJ Lang, TTY Lin, S McArthur, P Moriarty, R Mukherjee, D Nieto, RA Ong, AN Otte, M Pohl, A Popkow, E Pueschel, J Quinn, K Ragan, PT Reynolds, GT Richards, E Roache, C Rulten, I Sadeh, M Santander, GH Sembroski, D Staszak, S Trepanier, J Tyler, SP Wakely, A Weinstein, P Wilcox, A Wilhelm, DA Williams, B Zitzer, E Bellm, Z Cano, A Gal-Yam, DA Kann, EO Ofek, M Rigault, M Soumagnac


Measurement of the multi-TeV neutrino interaction cross-section with IceCube using Earth absorption.

Nature 551 (2017) 596-600

S Sarkar

Neutrinos interact only very weakly, so they are extremely penetrating. The theoretical neutrino-nucleon interaction cross-section, however, increases with increasing neutrino energy, and neutrinos with energies above 40 teraelectronvolts (TeV) are expected to be absorbed as they pass through the Earth. Experimentally, the cross-section has been determined only at the relatively low energies (below 0.4 TeV) that are available at neutrino beams from accelerators. Here we report a measurement of neutrino absorption by the Earth using a sample of 10,784 energetic upward-going neutrino-induced muons. The flux of high-energy neutrinos transiting long paths through the Earth is attenuated compared to a reference sample that follows shorter trajectories. Using a fit to the two-dimensional distribution of muon energy and zenith angle, we determine the neutrino-nucleon interaction cross-section for neutrino energies 6.3-980 TeV, more than an order of magnitude higher than previous measurements. The measured cross-section is about 1.3 times the prediction of the standard model, consistent with the expectations for charged- and neutral-current interactions. We do not observe a large increase in the cross-section with neutrino energy, in contrast with the predictions of some theoretical models, including those invoking more compact spatial dimensions or the production of leptoquarks. This cross-section measurement can be used to set limits on the existence of some hypothesized beyond-standard-model particles, including leptoquarks.


Implications for the origin of early-type dwarf galaxies - the discovery of rotation in isolated, low-mass early-type galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 468 (2017) 2850-2864

J Janz, SJ Penny, AW Graham, DA Forbes, RL Davies


DES15E2mlf: a spectroscopically confirmed superluminous supernova that exploded 3.5 Gyr after the big bang

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470 (2017) 4241-4250

Y-C Pan, RJ Foley, M Smith, L Galbany, CB D'Andrea, S Gonzalez-Gaitan, MJ Jarvis, R Kessler, E Kovacs, C Lidman, RC Nichol, A Papadopoulos, M Sako, M Sullivan, TMC Abbott, FB Abdalla, J Annis, K Bechtol, A Benoit-Levy, D Brooks, E Buckley-Geer, DL Burke, AC Rosell, MC Kind, J Carretero, FJ Castander, CE Cunha, LN da Costa, S Desai, HT Diehl, P Doel, TF Eifler, DA Finley, B Flaugher, J Frieman, J Garcia-Bellido, DA Goldstein, D Gruen, RA Gruendl, J Gschwend, G Gutierrez, DJ James, AG Kim, E Krause, K Kuehn, N Kuropatkin, O Lahav, M Lima, MAG Maia, M March, JL Marshall, P Martini, R Miquel, P Nugent, AA Plazas, AK Romer, E Sanchez, V Scarpine, M Schubnell, I Sevilla-Noarbe, RC Smith, F Sobreira, E Suchyta, MEC Swanson, RC Thomas, AR Walker, DES Collaboration


First search for dark matter annihilations in the Earth with the IceCube detector

EUROPEAN PHYSICAL JOURNAL C 77 (2017) ARTN 82

MG Aartsen, K Abraham, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, D Altmann, K Andeen, T Anderson, I Ansseau, G Anton, M Archinger, C Arguelles, J Auffenberg, S Axani, X Bai, SW Barwick, V Baum, R Bay, JJ Beatty, JB Tjus, K-H Becker, S BenZvi, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, S Blot, C Bohm, M Boerner, F Bos, D Bose, S Boeser, O Botner, J Braun, L Brayeur, H-P Bretz, S Bron, A Burgman, T Carver, M Casier, E Cheung, D Chirkin, A Christov, K Clark, L Classen, S Coenders, GH Collin, JM Conrad, DF Cowen, R Cross, M Day, JPAM de Andre, C De Clercq, EDP Rosendo, H Dembinski, S De Ridder, P Desiati, KD de Vries, G de Wasseige, M de With, T DeYoung, JC Diaz-Velez, V di Lorenzo, H Dujmovic, JP Dumm, M Dunkman, B Eberhardt, T Ehrhardt, B Eichmann, P Eller, S Euler, PA Evenson, S Fahey, AR Fazely, J Feintzeig, J Felde, K Filimonov, C Finley, S Flis, C-C Foesig, A Franckowiak, E Friedman, T Fuchs, TK Gaisser, J Gallagher, L Gerhardt, K Ghorbani, W Giang, L Gladstone, M Glagla, T Glauch, T Glsenkamp, A Goldschmidt, G Golup, JG Gonzalez, D Grant, Z Griffith, C Haack, AH Ismail, A Hallgren, F Halzen, E Hansen, B Hansmann, T Hansmann, K Hanson, D Hebecker, D Heereman, K Helbing, R Hellauer, S Hickford, J Hignight, GC Hill, KD Hoffman, R Hoffmann, K Holzapfel, K Hoshina, F Huang, M Huber, K Hultqvist, S In, A Ishihara, E Jacobi, GS Japaridze, M Jeong, K Jero, BJP Jones, M Jurkovic, A Kappes, T Karg, A Karle, U Katz, M Kauer, A Keivani, JL Kelley, J Kemp, A Kheirandish, M Kim, T Kintscher, J Kiryluk, T Kittler, SR Klein, G Kohnen, R Koirala, H Kolanoski, R Konietz, L Kopke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, K Krings, M Kroll, G Krueckl, C Krueger, J Kunnen, S Kunwar, N Kurahashi, T Kuwabara, M Labare, JL Lanfranchi, MJ Larson, F Lauber, D Lennarz, M Lesiak-Bzdak, M Leuermann, J Leuner, L Lu, J Lunemann, J Madsen, G Maggi, KBM Mahn, S Mancina, M Mandelartz, R Maruyama, K Mase, R Maunu, F McNally, K Meagher, M Medici, M Meier, A Meli, T Menne, G Merino, T Meures, S Miarecki, L Mohrmann, T Montaruli, M Moulai, R Nahnhauer, U Naumann, G Neer, H Niederhausen, SC Nowicki, DR Nygren, AO Pollmann, A Olivas, A O'Murchadha, T Palczewski, H Pandya, DV Pankova, P Peiffer, O Penek, JA Pepper, CP de los Heros, D Pieloth, E Pinat, PB Price, GT Przybylski, M Quinnan, C Raab, L Raedel, M Rameez, K Rawlins, R Reimann, B Relethford, M Relich, E Resconi, W Rhode, M Richman, B Riedel, S Robertson, M Rongen, C Rott, T Ruhe, D Ryckbosch, D Rysewyk, L Sabbatini, SES Herrera, A Sandrock, J Sandroos, S Sarkar, K Satalecka, M Schimp, P Schlunder, T Schmidt, S Schoenen, S Schoeneberg, L Schumacher, D Seckel, S Seunarine, D Soldin, M Song, GM Spiczak, C Spiering, M Stahlberg, T Stanev, A Stasik, J Stettner, A Steuer, T Stezelberger, RG Stokstad, A Stoessl, R Stroem, NL Strotjohann, GW Sullivan, M Sutherland, H Taavola, I Taboada, J Tatar, F Tenholt, S Ter-Antonyan, A Terliuk, G Tesic, S Tilav, PA Toale, MN Tobin, S Toscano, D Tosi, M Tselengidou, A Turcati, E Unger, M Usner, J Vandenbroucke, N van Eijndhoven, S Vanheule, M van Rossem, J van Santen, J Veenkamp, M Vehring, M Voge, E Vogel, M Vraeghe, C Walck, A Wallace, M Wallraff, N Wandkowsky, C Weaver, MJ Weiss, C Wendt, S Westerhoff, BJ Whelan, S Wickmann, K Wiebe, CH Wiebusch, L Wille, DR Williams, L Wills, M Wolf, TR Wood, E Woolsey, K Woschnagg, DL Xu, XW Xu, Y Xu, JP Yanez, G Yodh, S Yoshida, M Zoll, I Collaboration


Implications of strong intergalactic magnetic fields for ultrahigh-energy cosmic-ray astronomy

Physical Review D 96 (2017)

R Alves Batista, M-S Shin, J Devriendt, D Semikoz, G Sigl


The KMOS Cluster Survey (KCS). I. The Fundamental Plane and the Formation Ages of Cluster Galaxies at Redshift 1.4 < Z < 1.6

ASTROPHYSICAL JOURNAL 846 (2017) ARTN 120

A Beifiori, JT Mendel, JCC Chan, RP Saglia, R Bender, M Cappellari, RL Davies, A Galametz, RCW Houghton, LJ Prichard, R Smith, JP Stott, DJ Wilman, IJ Lewis, R Sharples, M Wegner


Strong Constraints on Cosmological Gravity from GW170817 and GRB 170817A.

Physical review letters 119 (2017) 251301-

T Baker, E Bellini, PG Ferreira, M Lagos, J Noller, I Sawicki

The detection of an electromagnetic counterpart (GRB 170817A) to the gravitational-wave signal (GW170817) from the merger of two neutron stars opens a completely new arena for testing theories of gravity. We show that this measurement allows us to place stringent constraints on general scalar-tensor and vector-tensor theories, while allowing us to place an independent bound on the graviton mass in bimetric theories of gravity. These constraints severely reduce the viable range of cosmological models that have been proposed as alternatives to general relativistic cosmology.


Cosmology with AGN dust time lags-simulating the new VEILS survey

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 464 (2017) 1693-1703

SF Honig, D Watson, M Kishimoto, P Gandhi, M Goad, K Horne, F Shankar, M Banerji, B Boulderstone, M Jarvis, M Smith, M Sullivan


KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering

Monthly Notices of the Royal Astronomical Society 474 (2017) 4894-4924

S Joudaki, C Blake, A Johnson, A Amon, M Asgari, A Choi, T Erben, K Glazebrook, J Harnois-Déraps, C Heymans, H Hildebrandt, H Hoekstra, D Klaes, K Kuijken, C Lidman, A Mead, L Miller, D Parkinson, GB Poole, P Schneider, M Viola, C Wolf

© 2017 The Author(s). We perform a combined analysis of cosmic shear tomography, galaxy-galaxy lensing tomography, and redshift-space multipole power spectra (monopole and quadrupole) using 450 deg 2 of imaging data by the Kilo Degree Survey (KiDS-450) overlapping with two spectroscopic surveys: the 2-degree Field Lensing Survey (2dFLenS) and the Baryon Oscillation Spectroscopic Survey (BOSS). We restrict the galaxy-galaxy lensing and multipole power spectrum measurements to the overlapping regions with KiDS, and self-consistently compute the full covariance between the different observables using a large suite of N-body simulations. We methodically analyse different combinations of the observables, finding that the galaxy-galaxy lensing measurements are particularly useful in improving the constraint on the intrinsic alignment amplitude, while the multipole power spectra are useful in tightening the constraints along the lensing degeneracy direction. The fully combined constraint on S 8 = σ 8 √ωm/0.3 = 0.742 ± 0.035, which is an improvement by 20 per cent compared to KiDS alone, corresponds to a 2.6s discordance with Planck, and is not significantly affected by fitting to a more conservative set of scales. Given the tightening of the parameter space, we are unable to resolve the discordance with an extended cosmology that is simultaneously favoured in a model selection sense, including the sum of neutrino masses, curvature, evolving dark energy and modified gravity. The complementarity of our observables allows for constraints on modified gravity degrees of freedom that are not simultaneously bounded with either probe alone, and up to a factor of three improvement in the S 8 constraint in the extended cosmology compared to KiDS alone.


An Application of Multi-band Forced Photometry to One Square Degree of SERVS: Accurate Photometric Redshifts and Implications for Future Science

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 230 (2017) ARTN 9

K Nyland, M Lacy, A Sajina, J Pforr, D Farrah, G Wilson, J Surace, B Haussler, M Vaccari, M Jarvis

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