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


Search for sterile neutrino mixing using three years of IceCube DeepCore data

PHYSICAL REVIEW D 95 (2017) ARTN 112002

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 Argelles, 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, 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, F 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, A 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 Gluesenkamp, 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, D Lennarz, M Lesiak-Bzdak, M Leuermann, 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, 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, CPDL 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 Stossl, 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, I Collaboration


Fluctuating feedback-regulated escape fraction of ionizing radiation in low-mass, high-redshift galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470 (2017) 224-239

M Trebitsch, J Blaizot, J Rosdahl, J Devriendt, A Slyz


Multimessenger time delays from lensed gravitational waves

Physical Review D 95 (2017)

T Baker, M Trodden


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

PHYSICAL REVIEW D 96 (2017) ARTN 023010

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


Covariant approach to parametrized cosmological perturbations

PHYSICAL REVIEW D 96 (2017) ARTN 064011

OJ Tattersall, M Lagos, PG Ferreira


MIGHTEE: The MeerKAT International GHz Tiered Extragalactic Exploration

IOP Conference Series: Materials Science and Engineering 198 (2017)

AR Taylor, M Jarvis

© Published under licence by IOP Publishing Ltd. The MeerKAT telescope is the precursor of the Square Kilometre Array mid-frequency dish array to be deployed later this decade on the African continent. MIGHTEE is one of the MeerKAT large survey projects designed to pathfind SKA key science in cosmology and galaxy evolution. Through a tiered radio continuum deep imaging project including several fields totaling 20 square degrees to microJy sensitivities and an ultra-deep image of a single 1 square degree field of view, MIGHTEE will explore dark matter and large scale structure, the evolution of galaxies, including AGN activity and star formation as a function of cosmic time and environment, the emergence and evolution of magnetic fields in galaxies, and the magnetic counter part to large scale structure of the universe.


Next Generation Virgo Cluster Survey. XXI. the Weak Lensing Masses of the CFHTLS and NGVS RedGOLD Galaxy Clusters and Calibration of the Optical Richness

Astrophysical Journal 848 (2017)

C Parroni, S Mei, T Erben, LV Waerbeke, A Raichoor, J Ford, R Licitra, M Meneghetti, H Hildebrandt, L Miller, P Côté, G Covone, JC Cuillandre, PA Duc, L Ferrarese, SDJ Gwyn, TH Puzia

© 2017. The American Astronomical Society. All rights reserved. We measured stacked weak lensing cluster masses for a sample of 1323 galaxy clusters detected by the RedGOLD algorithm in the Canada-France-Hawaii Telescope Legacy Survey W1 and the Next Generation Virgo Cluster Survey at 0.2 < z < 0.5, in the optical richness range 10 < λ < 70. This is the most comprehensive lensing study of a ∼100% complete and ∼80% pure optical cluster catalog in this redshift range. We test different mass models, and our final model includes a basic halo model with a Navarro Frenk and White profile, as well as correction terms that take into account cluster miscentering, non-weak shear, the two-halo term, the contribution of the Brightest Cluster Galaxy, and an a posteriori correction for the intrinsic scatter in the mass-richness relation. With this model, we obtain a mass-richness relation of logM 200 M o = (14.46 ± 0.02) + (1.04 ± 0.09)log(λ 40) (statistical uncertainties). This result is consistent with other published lensing mass-richness relations. We give the coefficients of the scaling relations between the lensing mass and X-ray mass proxies, L X and T X , and compare them with previous results. When compared to X-ray masses and mass proxies, our results are in agreement with most previous results and simulations, and consistent with the expected deviations from self-similarity.


Observational evidence that positive and negative AGN feedback depends on galaxy mass and jet power

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471 (2017) 28-58

E Kalfountzou, JA Stevens, MJ Jarvis, MJ Hardcastle, D Wilner, M Elvis, MJ Page, M Trichas, DJB Smith


The SCUBA-2 Cosmology Legacy Survey: 850 mu m maps, catalogues and number counts

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 465 (2017) 1789-1806

JE Geach, JS Dunlop, M Halpern, I Smail, P van der Werf, DM Alexander, O Almaini, I Aretxaga, V Arumugam, V Asboth, M Banerji, J Beanlands, PN Best, AW Blain, M Birkinshaw, EL Chapin, SC Chapman, C-C Chen, A Chrysostomou, C Clarke, DL Clements, C Conselice, KEK Coppin, WI Cowley, ALR Danielson, S Eales, AC Edge, D Farrah, A Gibb, CM Harrison, NK Hine, D Hughes, RJ Ivison, M Jarvis, T Jenness, SF Jones, A Karim, M Koprowski, KK Knudsen, CG Lacey, T Mackenzie, G Marsden, K McAlpine, R McMahon, R Meijerink, MJ Michalowski, SJ Oliver, MJ Page, JA Peacock, D Rigopoulou, EI Robson, I Roseboom, K Rotermund, D Scott, S Serjeant, C Simpson, JM Simpson, DJB Smith, M Spaans, F Stanley, JA Stevens, AM Swinbank, T Targett, AP Thomson, E Valiante, DA Wake, TMA Webb, C Willott, JA Zavala, M Zemcov


The IceCube realtime alert system

ASTROPARTICLE PHYSICS 92 (2017) 30-41

MG Aartsen, 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 Borner, E Bos, D Bose, S Boser, 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 Fosig, A Franckowiak, E Friedman, T Fuchs, TK Gaisser, J Gallagher, L Gerhardt, K Ghorbani, W Giang, L Gladstone, T Glauch, T Glusenkamp, 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 Kopke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, K Krings, M Kroll, G Kruckl, C Kruger, J Kunnen, S Kunwar, N Kurahashi, T Kuwabara, M Labare, JL Lanfranchi, MJ Larson, F Lauber, D Lennarz, M Lesiak-Bzdak, M Leuermann, 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, 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 Radel, 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 Schoneberg, L Schumacher, D Seckel, S Seunarine, D Soldin, M Song, GM Spiczak, C Spiering, T Stanev, A Stasik, J Stettner, A Steuer, T Stezelberger, RG Stokstad, A Stossl, R Strom, NL Strotjohann, GW Sullivan, M Sutherland, H Taavola, I Taboada, J Tatar, E 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, 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


Far-infrared emission in luminous quasars accompanied by nuclear outflows

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470 (2017) 2314-2319

N Maddox, MJ Jarvis, M Banerji, PC Hewett, N Bourne, L Dunne, S Dye, S Eales, C Furlanetto, SJ Maddox, MWL Smith, E Valiante

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