Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714259t&link_type=abstract
American Astronomical Society, AAS Meeting #217, #142.59; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
At the nucleus of the Seyfert galaxies, broad-line region (BLR) is surrounded by the dust torus. According to the unified model of active galactic nucleus (AGN), different types of Seyfert galaxies are classified based on viewing angle of the AGN: signature of BLR is missing in Seyfert 2s due to obscuration by dust torus. However, recent studies find some differences between the properties of the two types of Seyferts that are inconsistent with simple unified model. Simulations show that BLR features can also disappear at very low accretion rates onto the central black hole. Such low accretion rates may be accompanied by declining star formation rates in the host galaxy. We investigated this possibility through a multi-wavelength study of 44 nearby Seyfert galaxies selected from the Palomar spectral survey, using data/images observed by Chandra, GALEX, XMM-Optical Monitor (XMM-OM), HST, 2MASS, and Spitzer (IRAC and MIPS). We compare the global star formation rates measured from the near ultraviolet (GALEX and/or XMM-OM) and Spitzer 24 micron images, and quantify the galaxies' structure in each band using variety of methods such as 2-D decomposition, CAS (Concentration, Asymmetry, and Clumpiness) and Gini parameters. Correlations between these different parameters, including the nuclear accretion rates, therefore, reveal whether Seyfert 2 galaxies are the results of the viewing angle (following unified model) of AGN, or whether some Seyfert 2 galaxies have mechanically different properties from the others.
Funding for this project is provided through NASA/ADP grant NNX10AD77G.
Kim Hungsoo
Rutkowski Michael J.
Tamura Kazuyuki
Windhorst Rogier A.
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