Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..416g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 15, 1983, p. 416-422.
Astronomy and Astrophysics
Astrophysics
51
Absorption Spectra, Galactic Radiation, Seyfert Galaxies, Spectrophotometry, Emission Spectra, Galactic Nuclei, Least Squares Method, Line Spectra
Scientific paper
Spectrophotometric observations of the nuclei of Mrk 744 and Mrk 1066 are reported. A least-squares fitting procedure is used to decompose the spectra into the galaxy contribution, the power-law featureless continuum, and the emission-line spectrum. Equivalent widths of the G, b, and E2 absorption features were measured, and the corresponding values of the fraction of power-law contribution at 4800 A were calculated and compared to the least-squares results. The two sets of measurements agree well, indicating a featureless continuum fraction at 4800 A, f, of 0.41 + or - 0.08 and a spectral index alpha of 1.0 + or - 0.1 for Mrk 744, and f = 0.55 + or 0.02, alpha = 2.4 + or - 0.2 for Mrk 1066. It is suggested that Seyfert 1.8 galaxies such as Mrk 744 as well as Seyfert 1.9 galaxies may be objects in which the broad-line emitting region is seen nearly edge-on; the effects of extinction by dust are therefore unusually large.
Goodrich Robert W.
Osterbrock Donald E.
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