Extended H I-envelopes around spiral galaxies - NGC 2655 and NGC 2715

Details Extended H I-envelopes around spiral galaxies - NGC 2655 and NGC 2715 Extended H I-envelopes around spiral galaxies - NGC 2655 and NGC 2715

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109..331h&link_type=abstract

Astronomy and Astrophysics, vol. 109, no. 2, May 1982, p. 331-335. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astronomy

27

Astronomical Spectroscopy, Galactic Evolution, Hydrogen Clouds, Neutral Gases, Radio Astronomy, Spiral Galaxies, Absorption Spectra, Abundance, Interacting Galaxies, Line Spectra, Quasars, Radial Velocity, Spectral Line Width

Scientific paper

Extended H I envelopes around the Sa-galaxies NGC2655 and the Sc-galaxy NGC2715 are studied. Observations were done with the 100 m radiotelescope in Effelsberg. Global properties of the galaxies are given, including optical extent, inclination, H I radial velocity, integrated H I flux, line widths, total mass and luminosity. All galaxies known to have a ratio of H I diamater to optical diameter of 2.5 or larger, or more than two times the Holmberg diameter, are given along with their Hubble and luminosity type, H I diameter, coding for structure of H I extension and character of the galaxy, sensitivity limit of observations, and ratio of H I diameter to optical diameter. It is suggested that the circumgalactic gas is the leftover gas from merging galaxies already enriched with heavy elements, and that the extended H I in late-type and extended interacting galaxies should be identified with the gas producing low excitation absorption lines in quasars.

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