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Revealing the complex nature of the strong gravitationally lensed system H-ATLAS J090311.6+003906 using ALMA

Dye, S. and Furlanetto, C. and Swinbank, A. M. and Vlahakis, C. and Nightingale, J. W. and Dunne, L. and Eales, S. A. and Smail, Ian and Oteo, I. and Hunter, T. and Negrello, M. and Dannerbauer, H. and Ivison, R. J. and Gavazzi, R. and Cooray, A. and van der Werf, P. (2015) Revealing the complex nature of the strong gravitationally lensed system H-ATLAS J090311.6+003906 using ALMA. Monthly Notices of the Royal Astronomical Society, 452 (3). pp. 2258-2268. ISSN 0035-8711.

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We have modelled Atacama Large Millimetre/sub-millimetre Array (ALMA) long baseline imaging of the strong gravitational lens system H-ATLAS J090311.6+003906 (SDP.81). We have reconstructed the distribution of band 6 and 7 continuum emission in the z = 3.042 source and determined its kinematic properties by reconstructing CO(5–4) and CO(8–7) line emission in bands 4 and 6. The continuum imaging reveals a highly non-uniform distribution of dust with clumps on scales of ∼200 pc. In contrast, the CO line emission shows a relatively smooth, disc-like velocity field which is well fitted by a rotating disc model with an inclination angle of (40 ± 5)° and an asymptotic rotation velocity of 320 km s^(−1). The inferred dynamical mass within 1.5 kpc is (3.5 ± 0.5) × 10^(10) M_⊙ which is comparable to the total molecular gas masses of (2.7 ± 0.5) × 10^(10) M_⊙ and (3.5 ± 0.6) × 10^(10) M_⊙ from the dust continuum emission and CO emission, respectively. Our new reconstruction of the lensed Hubble Space Telescope near-infrared emission shows two objects which appear to be interacting, with the rotating disc of gas and dust revealed by ALMA distinctly offset from the near-infrared emission. The clumpy nature of the dust and a low value of the Toomre parameter of Q ∼ 0.3 suggest that the disc is in a state of collapse. We estimate a star formation rate in the disc of 470 ± 80 M⊙ yr^(−1) with an efficiency ∼65 times greater than typical low-redshift galaxies. Our findings add to the growing body of evidence that the most infrared luminous, dust obscured galaxies in the high-redshift Universe represent a population of merger-induced starbursts.

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Smail, Ian0000-0003-3037-257X
Cooray, A.0000-0002-3892-0190
van der Werf, P.0000-0001-5434-5942
Additional Information:© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 June 26. Received 2015 June 25. In original form 2015 April 13. First published online July 24, 2015. SD acknowledges financial support from the Midland Physics Alliance and STFC. CF acknowledges funding from CAPES (proc. 12203-1). MN acknowledges financial support by PRIN-INAF 2012 project ‘Looking into the dust-obscured phase of galaxy formation through cosmic zoom lenses in the H-ATLAS’. LD, RJI and IO acknowledge support from the European Research Council (ERC) in the form of the Advanced Investigator Program, COSMICISM. IRS acknowledges support from STFC (ST/L00075X/1), the ERC Advanced Investigator programme DUSTYGAL 321334 and a Royal Society/Wolfson Merit Award. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00016.SV. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The work in this paper is based on observations made with the NASA/ESA Hubble Space Telescope under the HST programme #12194.
Funding AgencyGrant Number
Midland Physics AllianceUNSPECIFIED
Science and Technology Facilities Council (STFC)ST/L00075X/1
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)12203-1
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
European Research Council (ERC)COSMICISM
European Research Council (ERC)DUSTYGAL 321334
Subject Keywords:gravitational lensing: strong; galaxies: structure
Issue or Number:3
Record Number:CaltechAUTHORS:20151002-122920511
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Official Citation:S. Dye, C. Furlanetto, A. M. Swinbank, C. Vlahakis, J. W. Nightingale, L. Dunne, S. A. Eales, Ian Smail, I. Oteo, T. Hunter, M. Negrello, H. Dannerbauer, R. J. Ivison, R. Gavazzi, A. Cooray, and P. van der Werf Revealing the complex nature of the strong gravitationally lensed system H-ATLAS J090311.6+003906 using ALMA MNRAS (September 21, 2015) Vol. 452 2258-2268 doi:10.1093/mnras/stv1442 First published online July 24, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60708
Deposited By: George Porter
Deposited On:05 Oct 2015 17:59
Last Modified:03 Oct 2019 08:59

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