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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The H i content of star-forming galaxies at z = 0.24
Monthly Notices of the Royal Astronomical Society, Volume 376, No. 3, Year 2007
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Description
We use observations from the Giant Metrewave Radio Telescope (GMRT) to measure the atomic hydrogen gas content of star-forming galaxies at z = 0.24 (i.e. a look-back time of ∼3 Gyr). The sample of galaxies studied were selected from Hα-emitting fieldgalaxies detected in a narrow-band imaging survey with the Subaru Telescope. The Anglo-Australian Telescope was used to obtain precise optical redshifts for these galaxies. We then co-added the H I 21-cm emission signal for all the galaxies within the GMRT spectral line data cube. From the co-added signal of 121 galaxies, we measure an average atomic hydrogen gas mass of (2.26 ± 0.90) × 109 M⊙. We translate this H i signal into a cosmic density of neutral gas at z = 0.24 of Ωgas = (0.91 ± 0.42) × 10-3. This is the current highest redshift at which Ωgas has been constrained from 21-cm emission and our value is consistent with that estimated from damped Lγα systems around this redshift. We also find that the correlations between the Ha luminosity and the radio continuum luminosity and between the star formation rate (SFR) and the H I gas content in star-forming galaxies at z = 0.24 are consistent with the correlations found at z = 0. These two results suggest that the star formation mechanisms in field galaxies ∼3 Gyr ago were not substantially different from the present, even though the SFR is three times higher. © 2007 RAS.
Authors & Co-Authors
Lah, Philip
Australia, Canberra
The Australian National University
Chengalur, Jayaram N.
India, Pune
National Centre for Radio Astrophysics India
Briggs, Franklin H.
Australia, Canberra
The Australian National University
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Colless, Matthew
Australia, Eastwood
Anglo Australian Observatory
de Propris, Roberto
Chile, La Serena
Cerro Tololo Inter American Observatory
Pracy, Michael B.
Australia, Canberra
The Australian National University
de Blök, Willem J.G.
Australia, Canberra
The Australian National University
Nagao, Tohru
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Taniguchi, Yoshiaki
Japan, Matsuyama
Ehime University
Yagi, Masafumi
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Okamura, Sadanori
Japan, Tokyo
The University of Tokyo
Statistics
Citations: 161
Authors: 11
Affiliations: 9
Identifiers
Doi:
10.1111/j.1365-2966.2007.11540.x
ISSN:
00358711
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative