NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T17:48:27 PDT
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For refcode 1998ApJS..119..159S:
Retrieve 91 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1998ApJS..119..159S A Deep Survey of H I-selected Galaxies: The Sample and the Data JOHN G. SPITZAK AND STEPHEN E. SCHNEIDER Five College Astronomy Program, Department of Physics and Astronomy, University of Massachusetts, Amherst, MA 01003 Received 1998 January 12; accepted 1998 June 29 ABSTRACT In a 21 cm neutral hydrogen survey of approximately 55 deg^2^ out to a redshift of cz = 8340 km s^-1^, we have identified 75 extragalactic H I sources. These objects comprise a well-defined sample of extragalactic sources chosen by means that are independent of optical surface brightness selection effects. In this paper we describe the Arecibo survey procedures and H I data, follow-up VLA H I observations made of several unusual sources, and Kitt Peak B-, R-, and I-band photometry for nearly all of the galaxies. We have also gathered information for some of the optically detected galaxies within the same search volume. We examine how samples generated by different types of search techniques overlap with selection by H I flux. Only the least massive H I object, which is among the lowest mass H I sources previously found, does not have a clear optical counterpart, but a nearby bright star may hide low surface brightness emission. However, the newly detected systems do have unusual optical properties. Most of the 40 galaxies that were not previously identified in magnitude-limited catalogs appear to be gas-dominated systems, and several of these systems have H I mass-to-light ratios among the largest values ever previously found. These gas-dominated objects also tend to have very blue colors, low surface brightnesses, and no central bulges, which correlate strongly with their relative star-to-gas content. Subject headings: galaxies: ISM-galaxies: photometry-radio lines: galaxies- surveys
Retrieve 91 NED objects in this reference.
Please click here for ADS abstract

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