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

Abstract

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.

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

References in corpus (3)

• Old Stellar Populations. VI. Absorption-Line Spectra of Galaxy Nuclei and Globular Clusters
• Reliable random error estimation in the measurement of line-strength indices
• Chemically Decoupled Nuclei in the Spiral Galaxies NGC 4216 and NGC 4501

Cited by in corpus (11)

• Structure and Kinematics of Early-Type Galaxies from Integral-Field Spectroscopy
• The SAURON project - III. Integral-field absorption-line kinematics of 48 elliptical and lenticular galaxies
• Quantifying the Coexistence of Massive Black Holes and Dense Nuclear Star Clusters
• Fundamental Planes, and the "barless" M-sigma relation, for supermassive black holes
• A Fast Bar in the Post-Interaction Galaxy NGC 1023
• Stellar Populations in Bulges
• Stellar Populations in Nearby Lenticular Galaxies
• Face-on galaxies NGC 524 and NGC 6340: chemically decoupled nuclei and inclined circumnuclear disks
• Splitting the lentils: Clues to galaxy/black hole coevolution from the discovery of offset relations for non-dusty versus dusty (wet-merger-built) lenticular galaxies in the $M_{\mathrm{bh}}$-$M_{\ast ,\mathrm{spheroid}}$ diagram
• The young nuclear stellar disc in the SB0 galaxy NGC 1023
• Synchronous Evolution of Galaxies in Groups: NGC 524 Group