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|Title:||WSRT Ultradeep Neutral Hydrogen Imaging of Galaxy Clusters at z ~ 0.2: A Pilot Survey of Abell 963 and Abell 2192|
Van Gorkom, J.H.
clusters: individual (Abell 963)
clusters: individual (Abell 2192)
|Publisher:||The University of Chicago Press for the American Astronomical Society|
|Citation:||The Astrophysical Journal, 2007, Vol. 668, pL9-L13.|
|Abstract:||A pilot study with the powerful new backend of the Westerbork Synthesis Radio Telescope (WSRT) of two galaxy clusters at z=0.2 has revealed neutral hydrogen emission from 42 galaxies. The WSRT probes a total combined volume of 3.4×104 Mpc3 at resolutions of 54×86 kpc2 and 19.7 km s-1, surveying both clusters and the large-scale structure in which they are embedded. In Abell 963, a dynamically relaxed, lensing Butcher-Oemler cluster with a high blue fraction, most of the gas-rich galaxies are located between 1 and 3 Mpc in projection, northeast from the cluster core. Their velocities are slightly redshifted with respect to the cluster, and this is likely a background group. None of the blue galaxies in the core of Abell 963 are detected in H I, although they have colors and luminosities similar to those of the H I detected galaxies in the cluster outskirts and field. Abell 2192 is less massive and more diffuse. Here the gas-rich galaxies are more uniformly distributed. The detected H I masses range from 5×109 to 4×1010 Msolar. Some galaxies are spatially resolved, providing rudimentary rotation curves useful for detailed kinematic studies of galaxies in various environments. This is a pilot for ultradeep integrations down to H I masses of 8×108 Msolar, providing a complete survey of the gas content of galaxies at z=0.2, probing environments ranging from cluster cores to voids.|
|Description:||Restricted Access. An open-access version is available at arXiv.org. Articles older than 2 years are open to all at the journal site (alternative location)|
|Copyright:||2007 American Astronomical Society|
|Appears in Collections:||Research Papers (A&A)|
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