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

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

Authors

Hugo Messias

S. Dye

Neil Nagar

Gustavo Orellana

R. Shane Bussmann

Jae Calanog

Helmut Dannerbauer

Hai Fu

Edo Ibar

Andrew Inohara

R.J. Ivison

Mattia Negrello

Dominik A. Riechers

Yun-Kyeong Sheen

James E. Aguirre

Simon Amber

Mark Birkinshaw

Nathan Bourne

Charles M. Bradford

Dave L. Clements

Asantha Cooray

Gianfranco De Zotti

Ricardo Demarco

Loretta Dunne

Stephen Eales

Simone Fleuren

Julia Kamenetzky

Roxana E. Lupu

Steve J. Maddox

Daniel P. Marrone

Michał J. Michałowski

Eric J. Murphy

Hien T. Nguyen

Alain Omont

Kate Rowlands

Dan Smith

Matt Smith

Elisabetta Valiante

Joaquin D. Vieira



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).

Journal Article Type Article
Journal Astronomy & Astrophysics
Electronic ISSN 1432-0746
Publisher EDP Open
Peer Reviewed Peer Reviewed
Volume 568
Article Number A92
Pages A92/1--A92/20
APA6 Citation Messias, H., Dye, S., Nagar, N., Orellana, G., Shane Bussmann, R., Calanog, J., …Vieira, J. D. (in press). Herschel-ATLAS and ALMA: HATLAS J142935.3-002836, a lensed major merger at redshift 1.027. Astronomy and Astrophysics, 568, A92/1--A92/20. doi:10.1051/0004-6361/201424410
DOI https://doi.org/10.1051/0004-6361/201424410
Keywords gravitational lensing: strong; galaxies: ISM; galaxies: kinematics and dynamics
Publisher URL http://www.aanda.org/articles/aa/abs/2014/08/aa24410-14/aa24410-14.html
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information © ESO, 2014

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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