The Arecibo Legacy Fast ALFA HI Survey: The Rich Galaxy Group Zwicky 1400+0949

Astronomy and Astrophysics – Astronomy

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Scientific paper

The Zwicky Cluster 1400+0949 (also known as the NGC 5416 group, one of the richest nearby galaxy groups) has been mapped as part of the Arecibo Legacy Fast ALFA (ALFALFA) extragalactic HI survey. This blind survey will map 7000 square degrees of the high galactic latitude sky visible from Arecibo, generating a HI line spectral database covering the redshift range -1600 to 18,000 km/s with about 5 km/s resolution. We present a catalog and atlas of ALFALFA HI detections in the region surrounding Zw 1400+0949, cz 6000 km/s. Using the observed HI velocities, and optical redshifts from the NASA Extragalactic Database (NED) for non-detected galaxies, we determine group membership and study the relationship of this group to surrounding structures. This work has been partially supported by NSF grants AST-0307661 and AST-0607007, by a grant from the Brinson Foundation, by Colgate University (the Faculty Research Council and the Division of Natural Sciences and Mathematics), and by the National Astronomy and Ionosphere Center (NAIC).

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