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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/229497
- A pilot survey of H I in field galaxies at redshift z ~ 0.2
- Catinella, Barbara; Haynes, Martha P.; Giovanelli, Riccardo; Gardner, Jeffrey P.; Connolly, Andrew J.
- We present the first results of a targeted survey carried out with the 305 m Arecibo telescope to detect HI-line emission from galaxies at redshift z>0.16. The targets, selected from the Sloan Digital Sky Survey database, are non-interacting disk galaxies in relatively isolated fields. We present here the HI spectra and derived HI parameters for ten objects detected in this pilot program. All are massive disk galaxies in the redshift interval 0.17-0.25 (i.e. 2-3 Gyr look-back time), with HI masses M_HI=3-8 x 10^10 Msun and high gas mass fractions (HI - to - stellar mass ratios ~10-30%). Our results demonstrate the efficacy of exploiting Arecibo's large collecting area to measure the HI mass and rotational velocity of galaxies above redshift z=0.2. In particular, this sample includes the highest redshift detections of HI emission from individual galaxies made to date. Extension of this pilot program will allow us to study the HI properties of field galaxies at cosmological distances, thus complementing ongoing radio synthesis observations of cluster samples at z~0.2.
- Publication type
- Journal article
- Astrophysical Journal Letters, Vol. 685, no. 1 (Sep 2008), pp. L13-L17
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Cosmology observations; Galaxies; Galaxy evolution; Radio lines; Spiral galaxies
- Institute of Physics Publishing
- Publisher URL
- Copyright © 2008 The American Astronomical Society. The American Astronomical Society does not allow Swinburne Research Bank to archive either the accepted manuscript or the published version of the article. However you can find an earlier version of the full text here: http://arxiv.org/abs/0808.1180
- Peer reviewed