Digital Repository

A survey for H I in the distant Universe: the detection of associated 21-cm absorption at z = 1.28

Show simple item record Curran, S. J. en_US Whiting, M. T. en_US Tanna, A. en_US Sadler, E. M. en_US Pracy, M. B. en_US ATHREYA, RAMANA en_US 2022-06-13T04:29:20Z 2022-06-13T04:29:20Z 2013-03 en_US
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, 429(4), 3402–3410. en_US
dc.identifier.issn 1365-2966 en_US
dc.identifier.issn 0035-8711 en_US
dc.identifier.uri en_US
dc.description.abstract We have undertaken a survey for H I 21-cm absorption within the host galaxies of z ∼ 1.2-1.5 radio sources, in the search of the cool neutral gas currently ‘missing’ at z ≳ 1. This deficit is believed to be due to the optical selection of high-redshift objects biasing surveys towards sources of sufficient ultraviolet luminosity to ionize all of the gas in the surrounding galaxy. In order to avoid this bias, we have selected objects above blue magnitudes of B ∼ 20, indicating ultraviolet luminosities below the critical value of LUV ∼ 1023 W Hz−1, above which 21-cm has never been detected. As a secondary requirement to the radio flux and faint optical magnitude, we shortlist targets with radio spectra suggestive of compact sources, in order to maximize the coverage of background emission. From this, we obtain one detection out of 10 sources searched, which at z = 1.278 is the third highest redshift detection of associated 21-cm absorption to date. Accounting for the spectra compromised by radio frequency interference, as well as various other possible pitfalls (reliable optical redshifts and turnover frequencies indicative of compact emission), we estimate a detection rate of ≈30 per cent, close to that expected for LUV ≲ 1023 W Hz−1 sources. en_US
dc.language.iso en en_US
dc.publisher Oxford University Pres en_US
dc.subject Galaxies: active en_US
dc.subject Galaxies: fundamental parameters en_US
dc.subject galaxies: high redshift en_US
dc.subject Quasars: absorption lines en_US
dc.subject Radio lines: galaxies en_US
dc.subject Ultraviolet: galaxies en_US
dc.subject 2013 en_US
dc.title A survey for H I in the distant Universe: the detection of associated 21-cm absorption at z = 1.28 en_US
dc.type Article en_US
dc.contributor.department Dept. of Physics en_US
dc.identifier.sourcetitle Monthly Notices of the Royal Astronomical Society en_US
dc.publication.originofpublisher Foreign en_US

Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search Repository

Advanced Search


My Account