Computer Science
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..350c&link_type=abstract
NOAO Proposal ID #2000B-0350
Computer Science
Scientific paper
We propose to obtain high-dispersion (R ~ 3000-4000) NIR long- slit spectra of a carefully selected complete sample of 15 Seyfert galaxies to search for stellar absorption lines from circumnuclear starbursts. We also request low-dispersion (R ~ 600-700) spectra to model the dilution of the lines by light from the AGN and hot dust. The low-dispersion spectra will also be used to measure emission lines, which will allow extinction measurements and will provide input data for starburst models. Using the line widths of the Si and CO stellar absorption lines at 1.59, 1.62 and 2.3 (mu)m, we will measure the velocity dispersion of the stars and thus the dynamical mass. Using the measured dilution factor, we will estimate the luminosity of the stellar component and measure the light-to-mass ratio in the nuclear region, and thus determine if young starbursts are present in Seyfert nuclei. The (corrected) stellar absorption line depths will be used to determine if red supergiants are present and hence the age of the putative starburst, thus we will be able to compare the stellar population with that in classical starburst galaxies. We have carefully selected 10 type 2 and 5 type 1 Seyfert galaxies that are not biased toward or against having circumnuclear starbursts. The goals of this project are to: (1) test the unified model to see if circumnuclear starbursts are present in both type 1 and type 2 Seyfert nuclei, (2) determine how common the starbursts are, (3) obtain accurate measurements of the properties (e.g., luminosity and age) of the starbursts, and (4) compare the properties of the starbursts with those in classical starburst galaxies. The results from this project will help to understand the possible connection between starbursts, Seyfert 1, and Seyfert 2 galaxies.
Colbert Edward
Heckman Tim
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