Revealing the complex nature of the strong gravitationally lensed system H-ATLAS J090311.6+003906 using ALMATools 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, Paul (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 1365-2966
AbstractWe 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) × 1010 MΘ which is comparable to the total molecular gas masses of (2.7 ± 0.5) × 1010 MΘ and (3.5 ± 0.6) × 1010 MΘ 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 MΘ 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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