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Neutral Hydrogen Gas in Star Forming Galaxies at z=0.24

Published online by Cambridge University Press:  01 June 2007

Philip Lah ,
Jayaram N. Chengalur ,
Frank H. Briggs ,
Matthew Colless ,
Roberto De Propris ,
Michael B. Pracy  and
W. J. G. de Blok
Philip Lah
Affiliation:
Research School of Astronomy & Astrophysics, The Australian National University, Australia
Jayaram N. Chengalur
Affiliation:
National Centre for Radio Astrophysics, India
Frank H. Briggs
Affiliation:
Research School of Astronomy & Astrophysics, The Australian National University, Australia Australian Telescope National Facility, Australia
Matthew Colless
Affiliation:
Anglo-Australian Observatory, Australia
Roberto De Propris
Affiliation:
Cerro Tololo Inter-American Observatory, Chile
Michael B. Pracy
Affiliation:
Research School of Astronomy & Astrophysics, The Australian National University, Australia
W. J. G. de Blok
Affiliation:
Research School of Astronomy & Astrophysics, The Australian National University, Australia
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Abstract

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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-backtime of ~3 Gyr). To measure the HI 21 cm emission signal we stack the signal from 121 galaxies with known optical positions and redshifts. We find an average HI mass for the galaxies of (2.26 ± 0.90) × 109 M⊙. We translate this HI measurement into a cosmic density of neutral gas at z=0.24 of Ωgas = (0.91 ± 0.42) × 10−3. This value is consistent with that estimated from damped Lyα systems around this redshift.

Keywords

galaxies: evolutiongalaxies: ISMradio lines: galaxiesradio continuum: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 366 - 367
Copyright
Copyright © International Astronomical Union 2008

References

Lah, P. et al. 2007, MNRAS, 376, 1357CrossRefGoogle Scholar
Prochaska, J. X., Herbert-Fort, S., & Wolfe, A. M. 2005, ApJ, 635, 123CrossRefGoogle Scholar
Rao, S. M., Turnshek, D. A., & Nestor, D. B. 2006, ApJ, 636, 610CrossRefGoogle Scholar
Zwaan, M. A., Meyer, M. J., Staveley-Smith, L., & Webster, R. L. 2005, MNRAS, 359, L30CrossRefGoogle Scholar