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Discovery of HI gas in a young radio galaxy at z = 0.44 using the Australian Square Kilometre Array Pathfinder

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arxiv 1503.01265 v2 pith:U3YLN7PU submitted 2015-03-04 astro-ph.GA

Discovery of HI gas in a young radio galaxy at z = 0.44 using the Australian Square Kilometre Array Pathfinder

J. R. Allison , E. M. Sadler , V. A. Moss , M. T. Whiting , R. W. Hunstead , M. B. Pracy , S. J. Curran , S. M. Croom
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M. Glowacki R. Morganti S. S. Shabala M. A. Zwaan G. Allen S. W. Amy P. Axtens L. Ball K. W. Bannister S. Barker M. E. Bell D. C.-J. Bock R. Bolton M. Bowen B. Boyle R. Braun S. Broadhurst D. Brodrick M. Brothers A. Brown J. D. Bunton C. Cantrall J. Chapman W. Cheng A. P. Chippendale Y. Chung F. Cooray T. Cornwell D. DeBoer P. Diamond P. G. Edwards R. Ekers I. Feain R. H. Ferris R. Forsyth R. Gough A. Grancea N. Gupta J. C. Guzman G. Hampson L. Harvey-Smith C. Haskins S. Hay D. B. Hayman I. Heywood A. W. Hotan S. Hoyle B. Humphreys B. T. Indermuehle C. Jacka C. Jackson S. Jackson K. Jeganathan S. Johnston J. Joseph R. Kendall M. Kesteven D. Kiraly B. S. Koribalski M. Leach E. Lenc E. Lensson S. Mackay A. Macleod M. Marquarding J. Marvil N. McClure-Griffiths D. McConnell P. Mirtschin R. P. Norris S. Neuhold A. Ng J. O'Sullivan J. Pathikulangara S. Pearce C. Phillips A. Popping R. Y. Qiao J. E. Reynolds P. Roberts R. J. Sault A. Schinckel P. Serra R. Shaw M. Shields T. Shimwell M. Storey T. Sweetnam E. Troup B. Turner J. Tuthill A. Tzioumis M. A. Voronkov T. Westmeier C. D. Wilson
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keywords radioabsorptionarrayaskapoutflowsourceaustraliancircumnuclear
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We report the discovery of a new 21-cm HI absorption system using commissioning data from the Boolardy Engineering Test Array of the Australian Square Kilometre Array Pathfinder (ASKAP). Using the 711.5 - 1015.5 MHz band of ASKAP we were able to conduct a blind search for the 21-cm line in a continuous redshift range between $z = 0.4$ and 1.0, which has, until now, remained largely unexplored. The absorption line is detected at $z = 0.44$ towards the GHz-peaked spectrum radio source PKS B1740$-$517 and demonstrates ASKAP's excellent capability for performing a future wide-field survey for HI absorption at these redshifts. Optical spectroscopy and imaging using the Gemini-South telescope indicates that the HI gas is intrinsic to the host galaxy of the radio source. The narrow OIII emission lines show clear double-peaked structure, indicating either large-scale outflow or rotation of the ionized gas. Archival data from the \emph{XMM-Newton} satellite exhibit an absorbed X-ray spectrum that is consistent with a high column density obscuring medium around the active galactic nucleus. The HI absorption profile is complex, with four distinct components ranging in width from 5 to 300 km s$^{-1}$ and fractional depths from 0.2 to 20 per cent. In addition to systemic HI gas, in a circumnuclear disc or ring structure aligned with the radio jet, we find evidence for a possible broad outflow of neutral gas moving at a radial velocity of $v \sim 300$ km s$^{-1}$. We infer that the expanding young radio source ($t_{\rm age} \approx 2500$ yr) is cocooned within a dense medium and may be driving circumnuclear neutral gas in an outflow of $\sim$ 1 $\mathrm{M}_{\odot}$ yr$^{-1}$.

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Cited by 2 Pith papers

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  1. Tracing Cold Gas in Absorption Across Cosmic Time with the SKA

    astro-ph.GA 2026-06 unverdicted novelty 3.0

    SKAO will enable HI and OH absorption surveys to characterize cold gas properties in galaxies from z=0 to beyond z=6.

  2. AGN Feeding & Feedback Over the Galactic Scales

    astro-ph.GA 2026-06 unverdicted novelty 2.0

    SKAO will trace synchrotron jets, thermal emission, and low-column-density HI gas in nearby AGN to characterize duty cycles and multi-phase feeding/feedback linked to star formation.