Near Infrared K- and L-band Spectroscopy of Low-Luminosity AGNs : Estimating the Contribution from Nuclear Starbursts

Details Near Infrared K- and L-band Spectroscopy of Low-Luminosity AGNs : Estimating the Contribution from Nuclear Starbursts Near Infrared K- and L-band Spectroscopy of Low-Luminosity AGNs : Estimating the Contribution from Nuclear Starbursts

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..408..292o&link_type=abstract

The Starburst-AGN Connection. ASP Conference Series, Vol. 408, proceedings of the conference held 27-31 October 2008, at Shangha

Astronomy and Astrophysics

Astronomy

Scientific paper

We report our first results of K- and L-band spectroscopic observations (SpeX on IRTF) for eight low-luminosity Seyfert galaxies to study the connection between nuclear starbursts and AGN activity. A polycyclic aromatic hydrocarbon (PAH) emission feature at 3.3μm in the L-band (2.8-4.1μm) is primarily used to investigate nuclear starburst activity in these galaxies.
This result shows that the putative nuclear starbursts are occurred in the low-luminosity Seyfert galaxies.
We find that there is no significant difference in nuclear starburst to AGN luminosity ratios of type 1 and 2 Seyfert galaxies. Whereas, we find that stellar luminosities in K-band estimated from the strength of the CO absorption features at 2.3-2.4μm produced by stellar photosphere of type 2 are statistically brighter than type 1. The result shows that it is possible that there is a bias AGN luminosity of type 2 is intrinsically brighter than type 1 in the samples selected by optical luminosity. If not, it is also possible the result plays an important role to understand the dust density distribution in the torus.

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