Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1510h&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #15.10; Bulletin of the American Astronomical Society, Vol. 24, p.1145
Astronomy and Astrophysics
Astronomy
Scientific paper
During recent years, the HI emission of thousands of galaxies has been cataloged, in large part through surveys of optically--selected galaxies in several relatively nearby superclusters. There is evidence that the effects of galaxy formation and evolution may be visible at redshifts which are only slightly larger than those surveyed to date. The detection of HI in host galaxies of nearby (z = 0.05 - 0.1) AGNs and QSOs, (e.g. Hutchings et al., 1987 A.J. 93, 6) and the chance discovery of the protodisk galaxy Malin 1 at z = 0.083 (Bothun et al., 1987 A.J., 94, 23) illustrates the need for enlarging the volume of space probed at 21 cm. Most importantly, new surveys should be undertaken which are not aimed specifically at optically--cataloged galaxies, to remove the bias against the detection of HI--rich, but optically--faint systems. We have undertaken a study with the Westerbork Synthesis Radio Telescope of the HI content and properties of normal galaxies in two Abell clusters, A1383 and A2626. These clusters are the most distant ever studied in HI, at z = 0.06. One target is a loose cluster with no detected X-ray or continuum emission. The second is more concentrated, with moderate X-ray and continuum emission. We have chosen these two different types of clusters in order to investigate environmental influence on cluster members, such as HI stripping by the intercluster medium. Because our survey is not specifically directed at cataloged galaxies, we are not biased against the detection of Malin 1 type systems. We are in a position to investigate evolutionary effects which may be detectable at this redshift.
Braun Robert
Henning Patricia A.
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