Publications


Models of gravitational lens candidates from SpaceWarps CFHTLS

Monthly Notices of the Royal Astronomical Society 474 (2018) 3700-3713

R Küng, P Saha, I Ferreras, E Baeten, J Coles, C Cornen, C Macmillan, P Marshall, A More, L Oswald, A Verma, JK Wilcox

© 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. We report modelling follow-up of recently discovered gravitational-lens candidates in the Canada France Hawaii Telescope Legacy Survey. Lens modelling was done by a small group of specially interested volunteers from the SpaceWarps citizen-science community who originally found the candidate lenses. Models are categorized according to seven diagnostics indicating (a) the image morphology and how clear or indistinct it is, (b) whether the mass map and synthetic lensed image appear to be plausible, and (c) how the lens-model mass compares with the stellar mass and the abundance-matched halo mass. The lensing masses range from ~10 11 to > 10 13 M ⊙ . Preliminary estimates of the stellar masses show a smaller spread in stellar mass (except for two lenses): a factor of a few below or above ~10 11 M ⊙ . Therefore, we expect the stellar-to-total mass fraction to decline sharply as lensing mass increases. The most massive system with a convincing model is J1434+522 (SW 05). The two low-mass outliers are J0206-095 (SW 19) and J2217+015 (SW 42); if these two are indeed lenses, they probe an interesting regime of very low star formation efficiency. Some improvements to the modelling software (SpaghettiLens), and discussion of strategies regarding scaling to future surveys with more and frequent discoveries, are included.


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


On the far-infrared metallicity diagnostics: applications to high-redshift galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473 (2018) 20-29

D Rigopoulou, M Pereira-Santaella, GE Magdis, A Cooray, D Farrah, R Marques-Chaves, I Perez-Fournon, D Riechers


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


WISDOM Project – III: Molecular gas measurement of the supermassive black hole mass in the barred lenticular galaxy NGC4429

Monthly Notices of the Royal Astronomical Society (2017)

TA Davis, M Bureau, K Onishi, FVD Voort, M Cappellari, S Iguchi, L Liu, EV North, M Sarzi, MD 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.


Dust and gas in star-forming galaxies at z similar to 3 Extending galaxy uniformity to 11.5 billion years

ASTRONOMY & ASTROPHYSICS 603 (2017) ARTN A93

GE Magdis, D Rigopoulou, E Daddi, M Bethermin, C Feruglio, M Sargent, H Dannerbauer, M Dickinson, D Elbaz, CG Guijarro, J-S Huang, S Toft, F Valentino


ALMA [N II] 205 mu m Imaging Spectroscopy of the Interacting Galaxy System BRI 1202-0725 at Redshift 4.7

ASTROPHYSICAL JOURNAL LETTERS 842 (2017) ARTN L16

N Lu, Y Zhao, T Diaz-Santos, C Kevin Xu, V Charmandaris, Y Gao, PP van der Werf, GC Privon, H Inami, D Rigopoulou, DB Sanders, L Zhu


No evidence for Population III stars or a direct collapse black hole in the z=6.6 Lyman alpha emitter 'CR7'

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 469 (2017) 448-458

RAA Bowler, RJ McLure, JS Dunlop, DJ McLeod, ER Stanway, JJ Eldridge, MJ Jarvis


Rise of the Titans: A Dusty, Hyper-luminous "870 mu m Riser" Galaxy at z similar to 6

ASTROPHYSICAL JOURNAL 850 (2017) ARTN 1

DA Riechers, TKD Leung, RJ Ivison, I Perez-Fournon, AJR Lewis, R Marques-Chaves, I Oteo, DL Clements, A Cooray, J Greenslade, P Martinez-Navajas, S Oliver, D Rigopoulou, D Scott, A Weiss


First detection of the 448 GHz H2O transition in space

ASTRONOMY & ASTROPHYSICS 601 (2017) ARTN L3

M Pereira-Santaella, E Gonzalez-Alfonso, A Usero, S Garcia-Burillo, J Martin-Pintado, L Colina, A Alonso-Herrero, S Arribas, S Cazzoli, F Rico, D Rigopoulou, T Storchi Bergmann


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.


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


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 LOFAR window on star-forming galaxies and AGNs - curved radio SEDs and IR-radio correlation at 0 < z < 2.5

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 469 (2017) 3468-3488

GC Rivera, WL Williams, MJ Hardcastle, K Duncan, HJA Rottgering, PN Best, M Brueggen, KT Chyzy, CJ Conselice, F de Gasperin, D Engels, G Gurkan, HT Intema, MJ Jarvis, EK Mahony, GK Miley, LK Morabito, I Prandoni, J Sabater, DJB Smith, C Tasse, PP van der Werf, GJ White


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


Interstellar medium conditions in z similar to 0.2 Lyman-break analogs

ASTRONOMY & ASTROPHYSICS 606 (2017) ARTN A86

A Contursi, AJ Baker, S Berta, B Magnelli, D Lutz, J Fischer, A Verma, M Nielbock, JG Carpio, S Veilleux, E Sturm, R Davies, R Genzel, S Hailey-Dunsheath, R Herrera-Camus, A Janssen, A Poglitsch, A Sternberg, LJ Tacconi


Investigating the unification of LOFAR-detected powerful AGN in the Bootes field

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 469 (2017) 1883-1896

LK Morabito, WL Williams, KJ Duncan, HJA Rottgering, G Miley, A Saxena, P Barthel, PN Best, M Bruggen, G Brunetti, KT Chyzy, D Engels, MJ Hardcastle, JJ Harwood, MJ Jarvis, EK Mahony, I Prandoni, TW Shimwell, A Shulevski, C Tasse


The Far InfraRed Spectroscopic EXplorer (FIRSPEX)

27th International Symposium on Space Terahertz Technology, ISSTT 2016 (2017)

D Rigopoulou, BK Tan, G Yassin

The Far InfraRed Spectroscopic EXplorer (FIRSPEX) is a novel concept for an astronomy satellite mission that will revolutionise our understanding of the properties of the Interstellar Medium (ISM) and star formation through velocity resolved spectroscopic observations at multi-terahertz frequencies. FIRSPEX comprises a fully cryogenic (~4K) heterodyne payload and a ~1.2 m primary antenna to scan the sky in a number of discreet spectroscopic channels delivering 3- dimensional spectral information. The spectral range selected contains important molecular, atomic and ionic species; the majority of which cannot be observed from the ground. FIRSPEX is UK led with additional contributions from partners throughout Europe. FIRSPEX opens up a relatively unexplored parameter space that will produce an enormously significant scientific legacy by focusing on the properties of the multi-phase ISM, the assembly of molecular clouds in our Galaxy and the onset of star formation topics which are fundamental to our understanding of galaxy evolution.

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