Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356..463z&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 20, 1990, p. 463-466.
Astronomy and Astrophysics
Astronomy
10
Galactic Radiation, Lyman Alpha Radiation, Seyfert Galaxies, Spectral Line Width, Emission Spectra, Magnesium, X Ray Astronomy
Scientific paper
It is found that the profiles of the UV emission lines Ly-alpha, C IV 1549, and Mg II 2798 in the Seyfert 1 galaxy Fairall 9 vary such that the lines are broader when the object is brighter. The profile changes occur mainly near the line center for Ly-alpha and C IV and in the wings for Mg II. These results indicate that the broad-line region (BLR) has a complex structure, possibly with nonspherical components. It is derived that part of the Ly-alpha and practically all of the C IV emission comes from optically thin clouds in the inner region of the BLR which are heated by an anisotropic UV continuum. These clouds may be moving radially. The Mg II and the rest of the Ly-alpha emission comes from very optically thick clouds which are more spherically distributed at a larger radius and heated mainly by X-ray radiation.
O'Brien Paul T.
Zheng Wei
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