The Relation of Black Hole Masses and Bulge Sizes in Seyfert 1 and Narrow-Line Seyfert 1 Galaxies

• Main Authors: Cheng-chung Chen, 陳正忠
• Other Authors: Chorng-Yuan Hwang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/25735371676140767472

碩士 === 國立中央大學 === 天文研究所 === 98 === We investigate the relation of the black hole masses and bulges of Seyfert 1 and narrow-line Seyfert 1 galaxies. Seyfert 1 and narrow-line Seyfert 1 galaxies both show fairly broad emission lines of high excitations; the emission lines are narrower for narrow-line Seyferrt 1 than those for Seyfert 1 galaxies. Some observations suggested that the black hole masses in the Seyfert 1 and narrow-line Seyfert 1 galaxies might be different. On the other hand, other observations suggested that the black hole masses, bulge masses, and velocity dispersion of galactic bulges followed similar relations for different kinds of AGNs, such as Seyfert 1 and QSOs. To investigate this problem, we analyze the HST WFPC2 images of several Seyfert 1 and narrow-line Seyfert 1 galaxies using the GALFIT package. We also compare the black hole masses and bulge sizes with FWHMHβ and FWHM[OIII] of our sample. For the narrow-line Seyfert 1 galaxies, we do not find significant correlation between the black hole and bulge mass; the correlation between FHWM of emission lines and black hole mass is not significant either. We derived a relation of black hole mass and bulge radius using virial theorem and some empirical relations. We find that both Seyfert 1 and narrow-line Seyfert 1 galaxies do distribute around this relation. However, the distribution of narrow-line Seyfert 1 galaxies are different from that of Seyfert 1 galaxies, indicating that they have different black hole masses.