An atlas of Calcium triplet spectra of active galaxies

Details An atlas of Calcium triplet spectra of active galaxies An atlas of Calcium triplet spectra of active galaxies

2005-02-23

arxiv.org/abs/astro-ph/0502478v1

Mon.Not.Roy.Astron.Soc.359:765-780,2005

Astronomy and Astrophysics

Astrophysics

18 pages, 10 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.08957.x

We present a spectroscopic atlas of active galactic nuclei covering the region around the 8498, 8542, 8662 Calcium triplet (CaT) lines. The sample comprises 78 objects, divided into 43 Seyfert 2s, 26 Seyfert 1s, 3 Starburst and 6 normal galaxies. The spectra pertain to the inner ~300 pc in radius, and thus sample the central kinematics and stellar populations of active galaxies. The data are used to measure stellar velocity dispersions (sigma_star) both with cross-correlation and direct fitting methods. These measurements are found to be in good agreement with each-other and with those in previous studies for objects in common. The CaT equivalent width is also measured. We find average values and sample dispersions of W_CaT of 4.6+/-2.0, 7.0 and 7.7+/-1.0 angstrons for Seyfert 1s, Seyfert 2s and normal galaxies, respectively. We further present an atlas of [SIII]\lambda 9069 emission line profiles for a subset of 40 galaxies. These data are analyzed in a companion paper which addresses the connection between stellar and Narrow Line Region kinematics, the behaviour of the CaT equivalent width as a function of sigma_star, activity type and stellar population properties.

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