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Date and Time of the Query: 2019-04-25 T15:42:33 PDT
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For refcode 2002A&A...390..829S:
Retrieve 73 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2002A&A...390..829S The Westerbork HI survey of spiral and irregular galaxies I. HI imaging of late-type dwarf galaxies R. A. Swaters, T. S. van Albada, J. M. van der Hulst and R. Sancisi Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands Dept. of Physics and Astronomy Johns Hopkins University, 3400 N. Charles Str., Baltimore, MD 21218, USA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy Received 3 August 2001/Accepted 6 December 2001 Abstract. Neutral hydrogen observations with the Westerbork Synthesis Radio Telescope are presented for a sample of 73 late-type dwarf galaxies. These observations are part of the WHISP project (Westerbork H I Survey of Spiral and Irregular Galaxies). Here we present H I maps, velocity fields, global profiles and radial surface density profiles of H I, as well as H I masses, H I radii and line widths. For the late-type galaxies in our sample, we find that the ratio of H I extent to optical diameter, defined as 6.4 disk scale lengths, is on average 1.8 +/- 0.8, similar to that seen in spiral galaxies. Most of the dwarf galaxies in this sample are rich in H I with a typical M_H I_/L_B_ of 1.5. The relative H I content M_H I_/L_R_ increases towards fainter absolute magnitudes and towards fainter surface brightnesses. Dwarf galaxies with lower average H I column densities also have lower average optical surface brightnesses. We find that lopsidedness is as common among dwarf galaxies as it is in spiral galaxies. About half of the dwarf galaxies in our sample have asymmetric global profiles, a third has a lopsided H I distribution, and about half shows signs of kinematic lopsidedness. Key words: surveys - galaxies: dwarf - galaxies: structure
Retrieve 73 NED objects in this reference.
Please click here for ADS abstract

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