H I observations of galaxies in the Hercules supercluster

Details H I observations of galaxies in the Hercules supercluster H I observations of galaxies in the Hercules supercluster

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1791f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Dec. 1988, p. 1791-1844.

Astronomy and Astrophysics

Astronomy

38

Astronomical Spectroscopy, Galactic Clusters, H I Regions, Hubble Constant, Line Spectra, Red Shift, Sky Surveys (Astronomy)

Scientific paper

The first installment of a H I redshift survey in the region of the Hercules supercluster, defined as 14h ≤ α ≤ 17h, 0° ≤ δ ≤ +38°, is presented. Two hundred ninety-eight new spectra of UGC galaxies, most of them in that area, are given; the measured parameters from those spectra and the computed H I properties are listed. The three-dimensional distribution of the sample deviates markedly from that expected for a randomly distributed sample. The survey volume contains an underdense region in front of the supercluster and a possible foreground cluster. The application of the Tully-Fisher relation for the detection of large-scale deviations from the Hubble flow is discussed. A method of detecting such streaming motion in a sample of galaxies that is seriously affected by Malmquist bias is given. An attempt to improve the Tully-Fisher relation by introducing additional observational parameters is shown to be unsuccessful. The application of this method allows a preliminary estimate of an upper limit to the expansion velocity of the void in front of the supercluster of 400 km s-1.

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