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Do Bars Trigger Activity in Galactic Nuclei?
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  • Do Bars Trigger Activity in Galactic Nuclei?
저자명
이광호,우종학,이명균,황호성,이종철,손주비,이종환,Lee. Gwang-Ho,Woo. Jong-Hak,Lee. Myung-Gyoon,Hwang. Ho-Seong,Lee. Jong-Chul,Sohn. Ju-Bee,Lee. Jong-H
간행물명
천문학회보
권/호정보
2011년|36권 2호|pp.75-75 (1 pages)
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한국천문학회
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

We investigate the connection between the presence of bars and AGN activity, using a volume-limited sample of ~6,000 late-type galaxies with axis ratio b/a > 0.6 and $M_r=-19.5+5logh$ at low redshift (0.02 < z ${leq}$ 0.055), selected from Sloan Digital Sky Survey Data Release 7. Although bars are believed to play an important role in fueling AGNs, it is still an open question whether AGN activity is connected with the presence of bars. We find that the bar fraction in AGN-host galaxies (44.1%) is 2.5 times higher than in non-AGN galaxies (17.6%), implying an AGN-bar connection. However, this trend is simply caused by the fact that AGN-host galaxies are on average more massive and redder than non-AGN galaxies since the bar fraction increases with u-r color and velocity dispersion. When AGN-host and non-AGN galaxies with fixed u-r color and velocity dispersion are compared, the excess of bar fraction in AGN-host galaxies disappears. Among AGN-host galaxies we find no strong difference of the Eddington ratio distributions between barred and non-barred systems. These results indicate that AGN activity is not directly connected with the presence of bars.