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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Herschel-ATLAS and ALMA: Hatlas j142935.3-002836, a lensed major merger at redshift 1.027
Astronomy and Astrophysics, Volume 568, Article A92, Year 2014
Notification
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Description
Context. The submillimetre-bright galaxy population is believed to comprise, aside from local galaxies and radio-loud sources, intrinsically active star-forming galaxies, the brightest of which are lensed gravitationally. The latter enable studies at a level of detail beyond what is usually possible by the observation facility. Aims. This work focuses on one of these lensed systems, HATLAS≠J142935.3-002836 (H1429-0028), selected in the Herschel-ATLAS field. Gathering a rich, multi-wavelength dataset, we aim to confirm the lensing hypothesis and model the background source's morphology and dynamics, as well as to provide a full physical characterisation. Methods. Multi-wavelength high-resolution data is utilised to assess the nature of the system. A lensing-analysis algorithm that simultaneously fits different wavebands is adopted to characterise the lens. The background galaxy dynamical information is studied by reconstructing the 3D source plane of the ALMA CO≠(J:4≠→≠3) transition. Near-IR imaging from HST and Keck-AO allows to constrain rest-frame optical photometry independently for the foreground and background systems. Physical parameters (such as stellar and dust masses) are estimated via modelling of the spectral energy distribution taking source blending, foreground obscuration, and differential magnification into account. Results. The system comprises a foreground edge-on disk galaxy (at zsp = 0.218) with an almost complete Einstein ring around it. The background source (at zsp = 1.027) is magnified by a factor of μ ~ 8-10 depending on wavelength. It is comprised of two components and a tens-of-kpc-long tidal tail resembling the Antennæ merger. As a whole, the background source is a massive stellar system (1.32-0.41+ 0.63 × 1011 M ⊙) forming stars at a rate of 394 ± 90 M⊙ yr-1, and it has a significant gas reservoir MISM = 4.6 ± 1.7 × 1010 M⊙. Its depletion time due to star formation alone is thus expected to be τSF = M ISM/SFR = 117 ± 51 Myr. The dynamical mass of one of the components is estimated to be 5.8 ± 1.7 × 1010 M ⊙, and, together with the photometric total mass estimate, it implies that H1429-0028 is a major merger system (1:2.8-1.5 +1.8). © 2014 ESO.
Authors & Co-Authors
Messias, Hugo G.
Chile, Biobio
Universidad de Concepcion
Portugal, Lisbon
Universidade de Lisboa
Dye, S.
United Kingdom, Nottingham
University of Nottingham
Nagar, Neil M.
Chile, Biobio
Universidad de Concepcion
Orellana-González, Gustavo A.
Chile, Biobio
Universidad de Concepcion
Calanog, Jae A.
United States, Irvine
University of California, Irvine
Dannerbauer, Helmut
Austria, Vienna
Universität Wien
Fu, Hai
United States, Iowa City
University of Iowa
Ibar, E.
Chile, Valparaiso
Universidad de Valparaiso
Ivison, Robert J.
United Kingdom, Edinburgh
The University of Edinburgh
Germany, Garching Bei Munchen
European Southern Observatory
Negrello, Mattia
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Riechers, Dominick A.
United States, Pasadena
California Institute of Technology
United States, Ithaca
Cornell University
Aguirre, James E.
United States, Philadelphia
University of Pennsylvania
Amber, Simon
United Kingdom, Milton Keynes
The Open University
Birkinshaw, Mark
United Kingdom, Bristol
University of Bristol
United States, Urbana
University of Illinois Urbana-champaign
Bourne, Nathan
United Kingdom, Nottingham
University of Nottingham
Bradford, Charles Matt
United States, Pasadena
California Institute of Technology
Clements, David L.
United Kingdom, London
Imperial College London
Cooray, Asantha Roshan
United States, Irvine
University of California, Irvine
United States, Pasadena
California Institute of Technology
de Zotti, Gianfranco
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Demarco, Richardo
Chile, Biobio
Universidad de Concepcion
Dunne, Loretta
United Kingdom, Edinburgh
The University of Edinburgh
New Zealand, Christchurch
University of Canterbury
Eales, Stephen A.
United Kingdom, Cardiff
Cardiff University
Fleuren, Simone
United Kingdom, London
Queen Mary University of London
Kamenetzky, Julia R.
United States, Boulder
University of Colorado Boulder
Lupu, Roxana E.
United States, Philadelphia
University of Pennsylvania
Maddox, Steve J.
United Kingdom, Edinburgh
The University of Edinburgh
New Zealand, Christchurch
University of Canterbury
Marrone, Daniel P.
United States, Tucson
The University of Arizona
Michałowski, Michał J.
United Kingdom, Edinburgh
The University of Edinburgh
Murphy, Eric Joseph
Unknown Affiliation
Nguyên, Hien Trong
United States, Pasadena
California Institute of Technology
Omont, Alain A.
France, Paris
Sorbonne Université
Rowlands, Kate E.
United Kingdom, St Andrews
University of st Andrews
Smith, Daniel James B.
United Kingdom, Hatfield
University of Hertfordshire
Smith, Matthew W.L.
United Kingdom, Cardiff
Cardiff University
Valiante, Elisabetta
United Kingdom, Cardiff
Cardiff University
Vieira, Joaquin D.
United States, Urbana
University of Illinois Urbana-champaign
Statistics
Citations: 34
Authors: 36
Affiliations: 26
Identifiers
Doi:
10.1051/0004-6361/201424410
ISSN:
00046361
Research Areas
Health System And Policy
Study Design
Cross Sectional Study