ASKAP HI imaging of the galaxy group IC 1459
P Serra, B Koribalski, V Kilborn, JR Allison, SW Amy, L Ball, K Bannister, ME Bell, DC-J Bock, R Bolton, M Bowen, B Boyle, S Broadhurst, D Brodrick, M Brothers, JD Bunton, J Chapman, W Cheng, AP Chippendale, Y Chung Show all
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2015
We present HI imaging of the galaxy group IC 1459 carried out with six antennas of the Australian Square Kilometre Array Pathfinder equipped with phased-array feeds. We detect and resolve HI in 11 galaxies down to a column density of ~1020 cm-2 inside a ~6 deg2 field and with a resolution of ~1 arcmin on the sky and ~8 kms-1 in velocity. We present HI images, velocity fields and integrated spectra of all detections, and highlight the discovery of three HI clouds - two in the proximity of the galaxy IC 5270 and one close to NGC 7418. Each cloud has an HI mass of ~109 M⊙ and accounts for ~15 per cent of the HI associated with its host galaxy. Available images at ultraviolet, optical and infrar..View full abstract
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Awarded by Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)
We acknowledge useful discussions with Phil Edwards and Ron Ekers. The Australian SKA Pathfinder is part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. This scientific work uses data obtained from the Murchison Radio-astronomy Observatory (MRO), which is jointly funded by the Commonwealth Government of Australia and State Government of Western Australia. The MRO is managed by the CSIRO, who also provide operational support to ASKAP. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. This work was supported by iVEC through the use of advanced computing resources located at The Pawsey Centre. Parts of this research were conducted by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020.