H I clouds in the Sculptor and Local Groups

Details H I clouds in the Sculptor and Local Groups H I clouds in the Sculptor and Local Groups

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1012a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, June 1985, p. 1012-1018.

Astronomy and Astrophysics

Astronomy

15

Galactic Clusters, Hydrogen Clouds, Local Group (Astronomy), Northern Sky, Radial Velocity, Red Shift, Quasars, Spatial Distribution

Scientific paper

Previous measures of low-redshift (- 400 km/s, + 300 km/s) hydrogen clouds over the sky are discussed. It is shown that there are H I clouds in the direction of the Sculptor Group galaxies, NGC 55 and NGC 300, which are distinguished from the Magellanic Stream in scale, redshift, and distribution on the sky. These H I clouds have redshift differences of - 220 km/s, + 100 km/s from the Sculptor Group galaxies with which they are associated. In the Northern Hemisphere, an elongated cloud discovered by Wright (1974) is shown to be aligned with the Local Group galaxy M33. Measures by van Kuilenberg (1972) show similarly disposed H I which altogether exhibits a Delta-z of - 220 km/s, + 130 km/s with respect to M33. The elongated H I cloud in the Sculptor Group which is aligned with NGC 300 is half the scale of the M33 cloud, but the Sculptor Group is twice the distance of M33. In the case of both NGC 300 and M33, the hydrogen near the galaxies is aligned nearly in the direction of associated lines of quasars. Evidence for additional H I clouds belonging to the Local Group is presented. A local filament of galaxies is proposed, stretching from the Sculptor group, through the Local Group, and out to the M81 group, NGC 2403, and M101.

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