Spectroscopic study of blue compact galaxies

Kong, Xu; Cheng, F. Z.

doi:10.1051/0004-6361:20020688

Cited by 31 publications

(38 citation statements)

References 23 publications

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“…These properties are typical of unevolved systems, thus suggesting that BCGs should have suffered very few bursts of star formation during their lives and that some of them are probably experiencing their first burst. In a recent review, Kunth &Östlin (2000) argued that, despite a few remaining young galaxy candidates (like I Zw 18, SBS 0335-052), in most BCGs an old underlying stellar population does exist, revealing at least another burst of star formation (SF) prior to the present one (Papaderos et al 1996;Kong & Cheng 2002). In addition, these properties make BCGs represent an extreme environment for star formation that differs from that in the Milky Way and in other quiescent nearby galaxies (Izotov & Thuan 1999; Send offprint requests to: X.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic study of blue compact galaxies

Kong

Cheng

Weiß

et al. 2002

A&A

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Abstract. This is the second paper in a series studying the star formation rates, stellar components, metallicities, and star formation histories and evolution of a sample of blue compact galaxies. We analyzed spectral properties of 97 blue compact galaxies, obtained with the Beijing Astronomical Observatory (China) 2.16 m telescope, with spectral range 3580 Å-7400 Å. We classify the spectra according to their emission lines: 13 of the total 97 BCG sample are non-emission line galaxies (non-ELGs); 10 have AGN-like emission (AGNs), and 74 of them are star-forming galaxies (SFGs). Emission line fluxes and equivalent widths, continuum fluxes, the 4000 Å Balmer break index and equivalent widths of absorption lines are measured from the spectra. We investigate the emission line trends in the integrated spectra of the star-forming galaxies in our sample, and find that: 1) The equivalent widths of emission lines are correlated with the galaxy absolute blue magnitude M B ; lower luminosity systems tend to have larger equivalent widths.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic study of blue compact galaxies

Kong

Cheng

Weiß

et al. 2002

A&A

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“…There are many definitions of BCD in the literature (Thuan & Martin 1981;Kong & Cheng 2002;Gil de Paz et al 2003). Generally, BCDs are characterized by their blue color, compact morphology, and low luminosity or stellar mass.…”

Section: Bcds At Z∼003mentioning

confidence: 99%

The Metallicity Evolution of Blue Compact Dwarf Galaxies From the Intermediate Redshift to the Local Universe

Lian

Fang

et al. 2016

ApJ

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We present oxygen abundance measurements for 74 blue compact dwarf (BCD) galaxies in the redshift range of [0.2, 0.5] using the strong-line method. The spectra of these objects are taken using Hectospec on the Multiple Mirror Telescope. More than half of these BCDs had dust attenuation corrected using the Balmer decrement method. For comparison, we also selected a sample of 2023 local BCDs from the Sloan Digital Sky Survey (SDSS) database. Based on the local and intermediate-z BCD samples, we investigated the cosmic evolution of the metallicity, star formation rate (SFR), and D n (4000) index. Compared with local BCDs, the intermediate-z BCDs had a systematically higher R23 ratio but a similar O32 ratio. Interestingly, no significant deviation in the massmetallicity (MZ) relation was found between the intermediate-z and local BCDs. Besides the metallicity, the intermediate-z BCDs also exhibited an SFR distribution that was consistent with local BCDs, suggesting a weak dependence on redshift. The intermediate-z BCDs seemed to be younger than the local BCDs with lower D n (4000) index values. The insignificant deviation in the mass-metallicity and mass-SFR relations between intermediate-z and local BCDs indicates that the relations between the global parameters of low-mass compact galaxies may be universal. These results from low-mass compact galaxies could be used to place important observational constraints on galaxy formation and evolution models.

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“…We have observed optical spectra of 97 blue compact galaxies with the 2.16 m telescope at the XingLong Station of the Beijing Astronomical Observatory (BAO) in China (Kong & Cheng 2002). Using emission lines of spectra, 74 BCGs with narrow emission lines were classified into star-forming galaxies (SFG; Kong et al 2002).…”

Section: Observationsmentioning

confidence: 99%

“…Using emission lines of spectra, 74 BCGs with narrow emission lines were classified into star-forming galaxies (SFG; Kong et al 2002). The main goal of this project is to measure the current star formation rates, stellar components, metallicities, and star formation histories and evolution of BCGs; therefore, we are mainly interested in these 74 BCGs.…”

Section: Observationsmentioning

confidence: 99%

Empirical Population Synthesis for 74 Blue Compact Galaxies

Kong

2003

The Evolution of Galaxies

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Abstract.We have observed the largest optical spectra sample of 74 blue compact galaxies. Stellar population properties of them were derived by comparing the equivalent widths of strong absorption features and continuum colors, using a method of empirical population synthesis based on star cluster sample. The results indicate that blue compact galaxies are typically age-composite stellar system, the continuum flux fractions at 5870Å due to old stellar components and young stellar components are both important for most of the galaxies. The stellar populations of blue compact galaxies present a variety of characteristics, and the contribution from different age and metallicity components is different. The star formation episodes are usually short, some galaxies maybe undergoing their first global episode of star formation, while for the most sample galaxies, older stars contribute to at most half the optical emission. Our results suggest that BCGs are old galaxies, in which star formation occurs in short intense burst separated by long quiescent phases.

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Spectroscopic study of blue compact galaxies

Cited by 31 publications

References 23 publications

Spectroscopic study of blue compact galaxies

Spectroscopic study of blue compact galaxies

The Metallicity Evolution of Blue Compact Dwarf Galaxies From the Intermediate Redshift to the Local Universe

Empirical Population Synthesis for 74 Blue Compact Galaxies

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