Herschel-ATLAS and ALMA. HATLAS J142935.3-002836, a lensed major merger at redshift 1.027 - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2014

Herschel-ATLAS and ALMA. HATLAS J142935.3-002836, a lensed major merger at redshift 1.027

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Hugo Messias
  • Function : Author
Simon Dye
  • Function : Author
Neil Nagar
  • Function : Author
Gustavo Orellana
  • Function : Author
R. Shane Bussmann
  • Function : Author
Jae Calanog
  • Function : Author
Helmut Dannerbauer
Hai Fu
Edo Ibar
  • Function : Author
Andrew Inohara
  • Function : Author
R. J. Ivison
  • Function : Author
Mattia Negrello
  • Function : Author
Dominik A. Riechers
  • Function : Author
Yun-Kyeong Sheen
  • Function : Author
James E. Aguirre
  • Function : Author
Simon Amber
  • Function : Author
Mark Birkinshaw
  • Function : Author
Nathan Bourne
  • Function : Author
Charles M. Bradford
  • Function : Author
Dave L. Clements
  • Function : Author
Asantha Cooray
  • Function : Author
Gianfranco de Zotti
  • Function : Author
Ricardo Demarco
Loretta Dunne
  • Function : Author
Stephen Eales
  • Function : Author
Simone Fleuren
  • Function : Author
Julia Kamenetzky
  • Function : Author
Roxana E. Lupu
  • Function : Author
Steve J. Maddox
  • Function : Author
Daniel P. Marrone
  • Function : Author
Michał J. Michałowski
  • Function : Author
Eric J. Murphy
  • Function : Author
Hien T. Nguyen
  • Function : Author
Alain Omont
Kate Rowlands
  • Function : Author
Dan Smith
  • Function : Author
Matt Smith
  • Function : Author
Elisabetta Valiante
  • Function : Author
Joaquin D. Vieira
  • Function : Author

Abstract

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 = MISM/ 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).
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Dates and versions

insu-03645350 , version 1 (25-04-2022)

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Hugo Messias, Simon Dye, Neil Nagar, Gustavo Orellana, R. Shane Bussmann, et al.. Herschel-ATLAS and ALMA. HATLAS J142935.3-002836, a lensed major merger at redshift 1.027. Astronomy and Astrophysics - A&A, 2014, 568, ⟨10.1051/0004-6361/201424410⟩. ⟨insu-03645350⟩
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