Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191..665b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 191, June 1980, p. 665-673. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
13
Emission Spectra, Forbidden Bands, Line Spectra, Seyfert Galaxies, Spectrophotometry, Spectrum Analysis, Helium, Hydrogen, Interstellar Extinction, Iron, Normal Density Functions
Scientific paper
Spectrophotometric scans and dispersion spectra at 50-150 A/mm and at 10-15 A/mm have been obtained for the class 2 Seyfert galaxy Markarian 3. Forbidden emission lines arising in a range of ionization states from O/0 to Fe/6+/ are present, together with recombination lines of H and He I, He II. The spectrum is found to be reddened by an amount corresponding to E(B-V) equal to 0.35 plus or minus 0.1; with regard to the helium abundance, an N(He)/N(H) of 0.09 plus or minus 0.02 was detected. In the emission region, Te was found to be 13,800 deg K, log Ne about 3.1, and total mass of gas is about 1,000,000 solar masses. In addition, profiles of the stronger lines were found to be asymmetric with an enhancement of the blue wing, and are adequately modeled by two Gaussian components. The visible continuum is predominantly stellar, with a featureless component contributing an estimated 20% of the total continuum strength at 4000 A.
Boksenberg Alec
Briggs S. A.
Carswell Robert F.
Sargent Wallace L. W.
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