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

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Allison, JR and Sadler, EM and Moss, VA and Whiting, MT and Hunstead, RW and Pracy, MB and Curran, SJ and Croom, SM and Glowacki, M and Morganti, R and Shabala, SS and Zwaan, MA and Allen, G and Amy, SW and Axtens, P and Ball, L and Bannister, KW and Barker, S and Bell, ME and Bock, DC-J and Bolton, R and Bowen, M and Boyle, B and Braun, R and Broadhurst, S and Brodrick, D and Brothers, M and Brown, A and Bunton, JD and Cantrall, C and Chapman, J and Cheng, W and Chippendale, AP and Chung, Y and Cooray, F and Cornwell, T and DeBoer, D and Diamond, P and Edwards, PG and Ekers, R and Feain, I and Ferris, RH and Forsyth, R and Gough, R and Grancea, A and Gupta, N and Guzman, JC and Hampson, G and Harvey-Smith, L and Haskins, C and Hay, S and Hayman, DB and Heywood, I and Hotan, AW and Hoyle, S and Humphreys, B and Indermuehle, BT and Jacka, C and Jackson, C and Jackson, S and Jeganathan, K and Johnston, S and Joseph, J and Kendall, R and Kesteven, M and Kiraly, D and Koribalski, BS and Leach, M and Lenc, E and Lensson, E and Mackay, S and Macleod, A and Marquarding, M and Marvil, J and McClure-Griffiths, N and McConnell, D and Mirtschin, P and Norris, RP and Neuhold, S and Ng, A and O'Sullivan, J and Pathikulangara, J and Pearce, S and Phillips, C and Popping, A and Qiao, RY and Reynolds, JE and Roberts, P and Sault, RJ and Schinckel, A and Serra, P and Shaw, R and Shields, M and Shimwell, T and Storey, M and Sweetnam, T and Troup, E and Turner, B and Tuthill, J and Tzioumis, A and Voronkov, MA and Westmeier, T and Wilson, CD, Discovery of H ɪ gas in a young radio galaxy at z = 0.44 using the Australian Square Kilometre Array Pathfinder, Monthly Notices of the Royal Astronomical Society, 453, (2) pp. 1249-1267. ISSN 0035-8711 (2015) [Refereed Article]


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Copyright Statement

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society : 2015 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

DOI: doi:10.1093/mnras/stv1532

Abstract

We report the discovery of a new 21-cm H i absorption system using commissioning data from the Boolardy Engineering Test Array of the Australian Square Kilometre Array Pathfinder (ASKAP). Using the 711.51015.5MHz 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 PKSB1740−517 and demonstrates ASKAP's excellent capability for performing a future wide-field survey for H i absorption at these redshifts. Optical spectroscopy and imaging using the Gemini-South telescope indicates that the H i gas is intrinsic to the host galaxy of the radio source. The narrow [O iii] emission lines show clear double-peaked structure, indicating either large-scale outflow or rotation of the ionized gas. Archival data from the XMMNewton satellite exhibit an absorbed X-ray spectrum that is consistent with a high column density obscuring medium around the active galactic nucleus. The H i absorption profile is complex, with four distinct components ranging in width from 5 to 300kms−1 and fractional depths from 0.2 to 20 per cent. In addition to systemic H i 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∼300kms−1. We infer that the expanding young radio source (tage≈2500yr) is cocooned within a dense medium and may be driving circumnuclear neutral gas in an outflow of ∼1Myr−1.

DOI for Erratum: doi:10.1093/mnras/stv2908

Item Details

Item Type:Refereed Article
Keywords:methods: data analysis, ISM: jets and outflows, galaxies: active, galaxies: ISM, radio lines: galaxies
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Cosmology and Extragalactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Shabala, SS (Dr Stas Shabala)
ID Code:102556
Year Published:2015
Funding Support:Australian Research Council (DE130101399)
Web of Science® Times Cited:30
Deposited By:Mathematics and Physics
Deposited On:2015-08-28
Last Modified:2017-11-03
Downloads:112 View Download Statistics

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