Young Stellar Nuclei in the Lenticular Galaxies. I. NGC 1023 and NGC 7332

Details Young Stellar Nuclei in the Lenticular Galaxies. I. NGC 1023 and NGC 7332 Young Stellar Nuclei in the Lenticular Galaxies. I. NGC 1023 and NGC 7332

1999-04-20

arxiv.org/abs/astro-ph/9904259v1

Astronomy and Astrophysics

Astrophysics

LATEX, 24 pages, + 19 Postscript figures. Accepted to Astronomical Journal, June issue

Scientific paper

10.1086/300876

As a result of bidimensional spectroscopy of the central parts of two nearby lenticular galaxies, NGC 1023 and NGC 7332, undertaken with the Multi-Pupil Field Spectrograph of the 6m telescope of the Special Astrophysical Observatory, their chemically decoupled stellar nuclei are found to be substantially younger than the surrounding bulges: the mean age of the nuclear stellar populations is 7 billion years in NGC 1023 and 2.5 +/- 0.5 billion years in NGC 7332. The morphological analysis undertaken by Seifert and Scorza (1996) for NGC 7332 and by us for NGC 1023 has revealed a existence of separate circumnuclear stellar disks with the radius of 80 pc in NGC 1023 and of 400 pc in NGC 7332; probably, the intermediate-age stellar populations are related to these structures.

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