Population synthesis for the spectra of blue compact dwarf galaxies
| Autor: | Xu Zhou, Jiansheng Chen, Xu Kong, F. Z. Cheng |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Physics
Stellar population Star formation Astronomy Balmer series Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy Stars symbols.namesake Star cluster Space and Planetary Science symbols Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Energy source Astrophysics::Galaxy Astrophysics Dwarf galaxy |
| Zdroj: | Chinese Astronomy and Astrophysics. 24:36-48 |
| ISSN: | 0275-1062 |
| Popis: | In order to study the history of star formation, energy source and internal dust distribution in blue compact dwarf galaxies (BCDGs), we have compared the observed spectra of the nuclei of 7 BCDGs with the predictions of stellar population synthesis model. The results suggest that BCDGs are old galaxies, in which star formation occur in short intense bursts separated by long quiescent phases. The star formation rate was very high during 5 × 107 ∼ 109 yr, but has now decreased. We find that the main energy source of BCDGs comes from young, massive stars. We have derived the internal reddening that affects the nuclear stellar population by the population synthesis method and the internal reddening of the emitting gas clouds from the Balmer line ratio and found the former to be consistently and significantly smaller than the latter. This feature can be explained by a model of foreground dust clumps with different covering factors for the gas and stars. Finally, based on the stellar population of BCGs (blue compact galaxies) and BCDGs, we suggest a detailed evolutionary link among different dwarf galaxies. |
| Databáze: | OpenAIRE |
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