Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...410..803b&link_type=abstract
Astronomy and Astrophysics, v.410, p.803-812 (2003)
Astronomy and Astrophysics
Astrophysics
3
Galaxies: Elliptical And Lenticular, Cd, Galaxies: Stellar Content, Galaxies: Nuclei
Scientific paper
We investigate the stellar population content in the lenticular galaxies NGC 1023, NGC 3115 and NGC 4203 applying a population synthesis method based on a seven component spectral basis with different ages - 2.5*E6, 10*E6, 25*E6, 75*E6, 200*E6, 1.2*E9 and older than 1010 years, and metallicity in the range -1.3<= [Z/Zsun] <=-0.2. This study employs two-dimensional STIS spectra in the range lambda lambda 2900-5700 Å, obtained from the Hubble Space Telescope public archives. We extracted one-dimensional spectra in adjacent windows 100 pc wide (projected distance) from the nuclear regions up to 300-400 pc. The largest contribution, both in lambda 5870 Å flux and mass fraction, comes from old stars (age >1010 years). We verified the possible existence of circumnuclear bursts (CNBs) in NGC 3115 and NGC 4203.
Bassin M.
Bonatto Ch.
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