NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-25 T04:15:34 PDT
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For refcode 1998MNRAS.301....1S:
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Copyright by Royal Astronomical Society. 1998MNRAS.301....1S Stellar populations in active galactic nuclei - I. The observations M. Serote Roos, C. Boisson, M. Joly and M. J. Ward Accepted 1998 May 5. Received 1998 May 5: in original form 1996 October 10 ABSTRACT Recent observations supported by theoretical models have led to the view that giant and supergiant stars are overabundant, and/or a high-metallicity component may be present in the stellar populations at the centres of active galaxies. Here we attempt to quantify these effects by observing the strengths of the stellar absorption lines of Mg b, NaI and the Ca II triplet, as well as molecular bands such as CN and TiO. Using long-slit spectroscopic data we are able to separate the stellar populations in and around the nucleus, for a sample including normal, LINER, starburst and Seyfert galaxies. In this paper we present the data, namely spectra of the nucleus and of a number of circumnuclear regions. Comparisons reveal gradients in both the reddening and the stellar population within the central regions of most galaxies. Detailed stellar population synthesis will be presented in a companion paper. Key words: methods: data analysis - galaxies: active - galaxies: nuclei - galaxies: stellar content.
Retrieve 15 NED objects in this reference.
Please click here for ADS abstract

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