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http://dx.doi.org/10.5467/JKESS.2009.30.1.069

Star Formation Rate and AGN in Barred Galaxies  

Bang, Jun (Korea Science Academy)
Ann, Hong-Bae (Division of Science Education, Pusan National University)
Publication Information
Journal of the Korean earth science society / v.30, no.1, 2009 , pp. 69-80 More about this Journal
Abstract
We investigate the dependence of star formation rate and Active Galaxy Nuclei (AGN) frequency on the bar properties, especially the bar strength, using SDSS DR6. To better represent the bar strength, we divided the bars into 6 classes according to their length and axial ratios. There seems to be a fairly good correlation between the star formation rate derived from $H{\alpha}$ emission lines and the bar strength, whereas there is no apparent correlation between the AGN activity and the bar strength. We interpret that the former correlation is due to the dependence of bar-driven gas inflow on the strength of bar. The lack of correlation between AGN and bar properties suggests that the accretion of gas onto a supermassive black hole (SMBH) is regulated by the interplay between the bar and SMBH. The frequency of AGN seems to be dependent on the background density but the star formation rate does not. It suggests that star formation is a localized phenomenon that is mostly determined by the gas density in a galaxy, while AGN activity is more closely related to the host property such as mass and luminosity that are thought to be dependent on the environment through the density-luminosity relation.
Keywords
barred galaxy; bar strength; star formation rate; AGN;
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Times Cited By KSCI : 3  (Citation Analysis)
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