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Titolo: On star formation rates in dwarf galaxies
Autore: Weilbacher, PM; Fritze-von Alvensleben, U;
- Indirizzi:
- Univ Sternwarte, D-37083 Gottingen, Germany Univ Sternwarte Gottingen Germany D-37083 te, D-37083 Gottingen, Germany
- Titolo Testata:
- ASTRONOMY & ASTROPHYSICS
fascicolo: 1,
volume: 373,
anno: 2001,
pagine: L9 - L12
- SICI:
- 1432-0746(200107)373:1<L9:OSFRID>2.0.ZU;2-Y
- Fonte:
- ISI
- Lingua:
- ENG
- Keywords:
- galaxies : starbursts; galaxies : dwarf; galaxies : evolution; galaxies : fundamental parameters;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 15
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Weilbacher, PM Univ Sternwarte, Geismarlandstr 11, D-37083 Gottingen, Germany Univ Sternwarte Geismarlandstr 11 Gottingen Germany D-37083
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- Citazione:
- P.M. Weilbacher e U. Fritze-von Alvensleben, "On star formation rates in dwarf galaxies", ASTRON ASTR, 373(1), 2001, pp. L9-L12
Abstract
We present evolutionary synthesis models of starbursts on top of old stellar populations to investigate in detailed time evolution the relation between H-alpha luminosity and star formation rate (SFR). The models show that several effects have an impact on the ratio between L(H-alpha) and SFR. Metallicity different from solar abundance, a time delay between star formationand maximum H-alpha-luminosity, and a varying stellar initial mass function give rise to strong variations in the ratio of H-alpha luminosity to SFR and can cause large errors in the determination of the SFR when employing well-known calibrations. When studying star-bursting dwarf galaxies, and sub-galactic fragments at high redshift, which show SFR fluctuating on short timescales, these effects can add up to errors of two orders of magnitude compared with the calibrations. To accurately determine the true current SFR additional data in combination with models for the spectral energy distribution are needed.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/05/13 alle ore 18:24:50