Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932301o&link_type=abstract
American Astronomical Society, AAS Meeting #219, #323.01
Other
Scientific paper
Galactic bars efficiently drive outer gas to the nuclear region of galaxies, and so they are often suspected to trigger central star-formation and active galactic nuclei (AGN) activities. However, the current status on this issue based on empirical studies is unsettling, especially on AGN. We investigate this question based on the Sloan Digital Sky Survey (SDSS) Data Release 7. Late-type galaxies are visually selected from the nearby (0.01 < z < 0.05) bright (Mr < -19) database. Among 6,658 late-type sample, we found 36% of galaxies to have a bar. Bars are found to be more common in galaxies with earlier morphology. Parameter-based selections would miss a large fraction of barred galaxies of early morphology, and so selection criteria become critical. Multiple factors (bar frequency, stellar mass, black-hole mass, gas contents, etc.) seem to contribute to bar effects on star formation or AGN in intricate manners. In the hope of breaking these degeneracies, we inspect bar effects for fixed galaxy properties. Bar effects on central star formation seem higher in redder galaxies. Bar effects on AGN, on the other hand, are higher in less massive galaxies. These effects seem more pronounced with increasing relative bar length. Our results imply that a large-scale bar can be a channel of gas inflow as expected, and the infalling gas activates both central star-forming and AGN activities under certain conditions. A careful sampling strategy and degeneracy-breaking analysis are necessary to find them.
Oh Kyungho
Oh Seulhee
Yi Kyung--Soo
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