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The host galaxies of narrow-line Seyfert-1s: Evidence for bar-driven fueling

Published online by Cambridge University Press:  01 December 2004

D. Michael Crenshaw ,
Rajesh Deo ,
S. B. Kraemer  and
J. R. Gabel
D. Michael Crenshaw
Affiliation:
Department of Physics and Astronomy, Georgia State University, One Park Place South SE, Suite 700, Atlanta, GA 30303, USA
Rajesh Deo
Affiliation:
Department of Physics and Astronomy, Georgia State University, One Park Place South SE, Suite 700, Atlanta, GA 30303, USA
S. B. Kraemer
Affiliation:
Catholic University of America and Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Code 681, Greenbelt, MD 20771, USA
J. R. Gabel
Affiliation:
University of Colorado, CASA, Boulder, CO 80309, USA
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Abstract

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We have studied the host-galaxy morphologies of narrow- and broad-line Seyfert 1 galaxies (NLS1s and BLS1s) based on broad-band optical images from the Hubble Space Telescope archives. We find that large-scale stellar bars, spanning 1–10 kpc from the nucleus, are much more common in NLS1s than BLS1s. Furthermore, the fraction of NLS1 spirals that have bars increases with decreasing full-width at half-maximum (FWHM) of the broad component of Hβ. This suggests a link between the large-scale bars, which can support high fueling rates to the inner kpc, and the high mass-accretion rates associated with the supermassive black holes in NLS1s. A preliminary examination of the inner (<1 kpc) dust morphologies has revealed no significant differences between NLS1s and BLS1s, except that we confirm the previous finding that galaxies with large-scale bars have a much higher frequency of “grand design” nuclear dust spirals.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
ORAL CONTRIBUTIONS
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS222 , March 2004 , pp. 415 - 418
Copyright
© 2004 International Astronomical Union