Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..569b&link_type=abstract
In ESA 3rd European IUE Conf. p 569-571 (SEE N83-11889 02-88)
Physics
1
Absorption Spectra, Lyman Alpha Radiation, Seyfert Galaxies, Gas Density, Gas Dynamics, Gas Temperature, Interstellar Gas, Iue, Line Spectra, Spin Temperature
Scientific paper
The origin of the NGC 1275 Lyman alpha absorption feature is discussed. The IUE spectrophotometric data are used to attribute the origin of this feature to the intervening galaxy responsible for the high velocity system of filamentary emission seen around NGC 1275. Profile fitting yields a hydrogen column density in the absorbing material of 1.8 times 10 to the 20th power atoms/sq cm. Combining this result with 21 cm absorption data yields a spin temperature 50 K for the absorbing gas. The temperature and density data confirm that the cloud would be destroyed by the nuclear X-ray source, unless it were hundreds of kpc from the center of NGC 1275. The lack of shock heating by the intracluster medium through which the cloud passes suggests that the medium is at least two orders of magnitude less dense than the cluster center, i.e., they are hundreds of kpc apart.
Boksenberg Alec
Briggs S. A.
Snijders A. J. M.
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