H I observations of the high-velocity system in NGC 1275

Details H I observations of the high-velocity system in NGC 1275 H I observations of the high-velocity system in NGC 1275

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..528v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 267, April 15, 1983, p. 528-534. Research supported by the Nederlandse Orga

Astronomy and Astrophysics

Astronomy

18

Astronomical Spectroscopy, Hydrogen Clouds, Radio Astronomy, Seyfert Galaxies, Absorption Spectra, H Lines, Spiral Galaxies

Scientific paper

An attempt to detect H I emission from the high-velocity system in the Seyfert galaxy NGC 1275 (Perseus A) is presented. The data were obtained with the Westerbork Synthesis Radio Telescope using a special calibration procedure to achieve high spectral dynamic range. The new upper limit of 2.4 x 10 to the 9th solar masses for the total H I mass in this system makes it unlikely that it is a very late-type galaxy, but the limit is still not low enough to exclude galaxies of type Sc or earlier. A tentative detection of a new weak broad absorption feature is reported, and the implications of an observed 30 percent increase in the intensity of the strong absorption feature are discussed.

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