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12th of September 2015
ASKAP discovery of HI gas in a young radio galaxy
by James Allison (CASS)
The ASKAP Boolardy Engineering Test Array (BETA) is being used to search for atomic hydrogen (HI) absorption at redshifts between 0.4 and 1, spanning almost 3.5 billion years of cosmic history. In their recent paper, Allison et al. (2015) demonstrated the unique capability of ASKAP for performing future wide-field HI absorption surveys in a largely unexplored epoch. Their first discovery revealed the cool gas surrounding the young radio galaxy PKS B1740-517, also providing the first spectroscopic redshift for this source. The spectrum shown was constructed by averaging over several observations with BETA and has an RMS sensitivity of 0.15 per cent of the continuum emission.

ASKAP photo credit: Robert Hollow

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