Stellar population gradient in lenticular galaxies: NGC 1023, NGC 3115 and NGC 4203

Free access article

Issue		A&A Volume 410, Number 3, November II 2003


Page(s)		803 - 812
Section		Galactic structure and dynamics
DOI		http://dx.doi.org/10.1051/0004-6361:20031261

A&A 410, 803-812 (2003)
DOI: 10.1051/0004-6361:20031261

Stellar population gradient in lenticular galaxies: NGC 1023, NGC 3115 and NGC 4203

M. Bassin and Ch. Bonatto

Universidade Federal do Rio Grande do Sul, Instituto de Física, CP 15051, Porto Alegre CEP 91501-970, RS, Brazil
(Received 11 March 2003 / Accepted 2 July 2003)

Abstract
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 - $2.5\times10^6$ , $10\times10^6$ , $25\times10^6$ , $75\times10^6$ , $200\times10^6$ , $1.2\times10^9$ and older than 10¹⁰ years, and metallicity in the range $-1.3\leq$ $[Z/Z_{\odot}]$ $\leq-0.2$ . 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.

Key words: galaxies: elliptical and lenticular, cD -- galaxies: stellar content -- galaxies: nuclei

Offprint request: Ch. Bonatto, charles@if.ufrgs.br

SIMBAD Objects

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.