TY - JOUR
T1 - Herschel-ATLAS and ALMA HATLAS J142935.3-002836, a lensed major merger at redshift 1.027
AU - Messias, Hugo
AU - Dye, Simon
AU - Nagar, Neil
AU - Orellana, Gustavo
AU - Bussmann, R. Shane
AU - Calanog, Jae
AU - Dannerbauer, Helmut
AU - Fu, Hai
AU - Ibar, Edo
AU - Inohara, Andrew
AU - Ivison, R. J.
AU - Negrello, Mattia
AU - Riechers, Dominik A.
AU - Sheen, Yun-Kyeong
AU - Aguirre, James E.
AU - Amber, Simon
AU - Birkinshaw, Mark
AU - Bradford, Charles M.
AU - Clements, Dave L.
AU - Cooray, Asantha
AU - De Zotti, Gianfranco
AU - Demarco, Ricardo
AU - Eales, Stephen
AU - Fleuren, Simone
AU - Kamenetzky, Julia
AU - Lupu, Roxana E.
AU - Marrone, Daniel P.
AU - Michalowski, Michal J.
AU - Murphy, Eric J.
AU - Nguyen, Hien T.
AU - Omont, Alain
AU - Rowlands, Kate
AU - Smith, Dan
AU - Smith, Matt
AU - Valiante, Elisabetta
AU - Vieira, Joaquin D.
AU - Bourne, Nathan
AU - Dunne, Loretta
AU - Maddox, Stephen
PY - 2014/8
Y1 - 2014/8
N2 - 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 z(sp) = 0.218) with an almost complete Einstein ring around it. The background source (at z(sp) = 1.027) is magnified by a factor of p = 8-10 depending on wavelength. It is comprised of two components and a tens-of-kpc-long tidal tail resembling the Antenna merger. As a whole, the background source is a massive stellar system (1.32(0.41)(+0.63) x 10(11) M.) forming stars at a rate of 394 +/- 90 Mo yr(-1), and it has a significant gas reservoir M-ISM = 4.6 + 1.7 x 10(10) M-circle dot. Its depletion time due to star formation alone is thus expected to be T-sF = M-ISM/SFR = 117 +/- 51 Myr. The dynamical mass of one of the components is estimated to be 5.8 +/- 1.7 x 10(10) M., and, together with the photometric total mass estimate, it implies that H1429-0028 is a major merger system (1: 2.8+ 1).
AB - 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 z(sp) = 0.218) with an almost complete Einstein ring around it. The background source (at z(sp) = 1.027) is magnified by a factor of p = 8-10 depending on wavelength. It is comprised of two components and a tens-of-kpc-long tidal tail resembling the Antenna merger. As a whole, the background source is a massive stellar system (1.32(0.41)(+0.63) x 10(11) M.) forming stars at a rate of 394 +/- 90 Mo yr(-1), and it has a significant gas reservoir M-ISM = 4.6 + 1.7 x 10(10) M-circle dot. Its depletion time due to star formation alone is thus expected to be T-sF = M-ISM/SFR = 117 +/- 51 Myr. The dynamical mass of one of the components is estimated to be 5.8 +/- 1.7 x 10(10) M., and, together with the photometric total mass estimate, it implies that H1429-0028 is a major merger system (1: 2.8+ 1).
KW - gravitational lensing: strong
KW - galaxies: ISM
KW - galaxies: kinematics and dynamics
KW - STAR-FORMING GALAXIES
KW - SCIENCE DEMONSTRATION PHASE
KW - DEGREE EXTRAGALACTIC SURVEY
KW - SPITZER-SPACE-TELESCOPE
KW - 1200-MU-M MAMBO SURVEY
KW - DIGITAL SKY SURVEY
KW - DEEP FIELD-SOUTH
KW - SUBMILLIMETER GALAXIES
KW - MOLECULAR GAS
KW - INTERSTELLAR-MEDIUM
U2 - 10.1051/0004-6361/201424410
DO - 10.1051/0004-6361/201424410
M3 - Article
SN - 0004-6361
VL - 568
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
M1 - 92
ER -