Computer Science
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..222..153v&link_type=abstract
The Interplay among Black Holes, Stars and ISM in Galactic Nuclei, Proceedings of IAU Symposium, No. 222. Edited by T. Storchi-B
Computer Science
Scientific paper
Stellar velocity dispersions in AGN are useful indicators of the black-hole mass (through the M&sun;-σ* relation) and nuclear stellar populations (through the M/L ratio). We have collected near-infrared spectra of ˜40 Seyferts in the CaII triplet range in order to measure σ* and investigate the connection between stellar populations and AGN properties. In this poster we present a comparison between two methods to measure velocity dispersions: (1) direct fitting (DFM) and (2) cross-correlation (CCM). (1) In DFM the spectra in the CaII triplet range is modeled as a combination of a broadened and shifted stellar spectrum (observed through the same instrumental setup) and a featureless continuum. This method has the advantage of making it easy to mask out noisy regions and sky residuals. (2) CCM converts the width of the star-galaxy cross-correlation function onto a velocity dispersion. We find that these methods yield velocity dispersions consistent to within 20 km s-1 on-average. Our results are consistent to within 20 km s-1 with those objects available in the literature.
Cid Fernandes Roberto
Garcia-Rissmann Aurea
Rodolfo Vega Neme Luis
Vale Asari Natalia
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