PKS B1740-517: an ALMA view of the cold gas feeding a distant interacting young radio galaxy

J. R. Allison, E. K. Mahony, V. A. Moss, E. M. Sadler, M. T. Whiting, R. F. Allison, J. Bland-Hawthorn, S. J. Curran, B. H. C. Emonts, C. D. P. Lagos, R. Morganti, G. Tremblay, M. Zwaan, C. S. Anderson, J. D. Bunton, M. A. Voronkov

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Cold neutral gas is a key ingredient for growing the stellar and central black hole mass in galaxies throughout cosmic history. We have used the Atacama Large Millimetre Array to detect a rare example of redshifted (CO)-C-12 (2-1) absorption in PKS B1740-517, a young (t similar to 1.6 x 10(3) yr) and luminous (L-5GH approximate to 6.6 x 10(43) erg s(-1)) radio galaxy at z = 0.44 that is undergoing a tidal interaction with at least one lower mass companion. The coincident H I 21-cm and molecular absorption have very similar line profiles and reveal a reservoir of cold gas (M-gas similar to 10(7) -10(8) M-circle dot), likely distributed in a disc or ring within a few kiloparsecs of the nucleus. A separate HI component is kinematically distinct and has a very narrow line width (Delta u(FWHM)

Original languageEnglish
Pages (from-to)2934-2949
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - Jan 2019

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