Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010acasn..51...18f&link_type=abstract
Acta Astronomica Sinica, vol. 51, no. 1, p. 18-26
Astronomy and Astrophysics
Astronomy
Galaxies: Seyfert, Methods: Numerical
Scientific paper
The tight relation between the black hole mass and the stellar velocity dispersion indicates that the velocity dispersion is an important parameter to estimate the black hole mass. A new method is proposed in this paper to measure the stellar velocity dispersion and its uncertainty for a sample of Seyfert galaxies from Sloan Digital Sky Survey (SDSS). Through fitting four spectral regions which contain stellar absorption features in pixel domain including the Ca II K, Mg I b triplet and Ca II triplet absorption lines, we determine a better spectral region to measure the stellar velocity dispersion. The results show a significant difference: the values obtained in Mg I b region are smaller due to the contamination from the broad Fe II emission lines; the velocity dispersion is easily biased by the searching algorithm in Ca II K region because of the weakness of lines; and similar results are derived in Ca II K+Ca II triplet and Ca II K regions. For the Seyfert galaxies with z<0.05, we conclude that Ca II triplet is the best choice to measure the stellar velocity dispersion.
Fu Xiangyun
Gu Qiu-Sheng
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