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Discovery of HI gas in a young radio galaxy at $z = 0.44$ using the Australian SKA 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
; M. Glowacki
; R. Morganti
; S. S. Shabala
; M. A. Zwaan
; G. Allen
; S. Amy
; P. Axtens
; L. Ball
; K. W. Bannister
; S. Barker
; T. Bateman
; R. Beresford
; M. E. Bell
; D. Bock
; R. Bolton
; M. Bowen
; B. Boyle
; R. Braun
; S. Broadhurst
; D. Brodrick
; K. Brooks
; M. Brothers
; A. Brown
; J. D. Bunton
; C. Cantrall
; G. Carrad
; J. Chapman
; W. Cheng
; A. P. Chippendale
; Y. Chung
; F. Cooray
; T. Cornwell
; E. Davis
; L. de Souza
; D. DeBoer
; P. Diamond
; P. Edwards
; R. Ekers
; I. Feain
; D. 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. Koribalski
; M. Leach
; E. Lenc
; E. Lensson
; L. Li
; S. Mackay
; A. Macleod
; T. Maher
; M. Marquarding
; J. Marvil
; N. McClure-Griffiths
; D. McConnell
; S. Mickle
; P. Mirtschin
; R. Norris
; S. Neuhold
; A. Ng
; J. O'Sullivan
; J. Pathikulangara
; S. Pearce
; C. Phillips
; A. Popping
; R. Y. Qiao
; J. E. Reynolds
; A. Rispler
; P. Roberts
; D. Roxby
; 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. Wilson
; T. Wilson
; K. Wormnes
; X. Wu
; | | Date: |
4 Mar 2015 | | Abstract: | We report the discovery of a new 21cm HI absorption system using
commissioning data from the Boolardy Engineering Test Array (BETA) of the
Australian Square Kilometre Array Pathfinder (ASKAP). Using the 711.5-1015.5MHz
band of ASKAP we were able to conduct a blind search for the 21cm line in a
continuous redshift range between $z =$ 0.4-1.0, which has, until now, remained
largely unexplored. The absorption line, detected at $z = 0.44$ towards the
GHz-peaked spectrum radio source PKSB1740$-$517, is confirmed by optical
spectroscopy, using the Gemini South telescope, to be intrinsic to the
early-type host galaxy. We detect a broad component at 0.2 per cent of the
continuum, demonstrating ASKAP’s excellent capability for performing a future
wide-field survey for HI absorption at these redshifts. The [OIII] and [OI]
emission lines in the Gemini spectrum are broad and have double-peaked
structures, pointing to outflowing ionised gas. Archival data from the
XMM-Newton satellite exhibit an absorbed X-ray spectrum that is consistent with
a high column density obscuring medium around the AGN. The absorption profile
is complex, with four distinct components ranging in width from 5-300kms$^{-1}$
and fractional depths from 0.2-20 per cent. In addition to systemic HI gas,
likely in a regular disc or ring structure, we find evidence for one or two
blue shifted clouds and a broad outflow of neutral gas moving at a radial
velocity of $v sim 300$kms$^{-1}$. We infer that the expanding young radio
source ($t_{
m age} approx 2500$yr) is driving surrounding neutral gas in an
outflow of $sim1mathrm{M}_{odot}$yr$^{-1}$. | | Source: | arXiv, 1503.1265 | | Services: | Forum | Review | PDF | Favorites | |
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