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Gaseous versus Stellar Velocity Dispersion in Emission-Line Galaxies
XiaoYan Chen1; CaiNa Hao1; Jing Wang2
2008
Source PublicationChinese Astronomy and Astrophysics
ISSN0275-1062
Volume8Issue:1Pages:25
AbstractWe compare the ionized gas velocity dispersion σgas with the stellar velocity dis-persion σ* in star-forming galaxies, composite galaxies, Low Ionization Nuclear Emission-line Regions (LINERs) and Seyfert 2s, compiled from a cross-identification of Sloan Digital Sky Survey Fourth Data Release (SDSS DR4) and Point Source Catalogue Redshift Survey (PSCz). We measure σgas from the FWHMs of emission lines (Hα, NIIλλ6548, 6583 and SII λλ6716, 6731). A significant correlation between the gas and stellar velocity dispersion exists, despite substantial scatter. The mean value of the gas to stellar velocity dispersion ratio is close to unity. This suggests that gas velocity dispersion can substitute for the stellar veloc-ity dispersion as a tracer of the gravitational potential well for all the four types of galaxies,but the involved uncertainties are different from type to type. We also studied σgas/σ* as a function of the redshift and the axial ratio to test the effects of aperture and galaxy inclina-tion, and found that both effects are weak. Finally we checked the trend of σgas/σ* with the infrared luminosity and found no significant correlation.
Keywordgalaxies active - galaxies interactions - galaxies star-forming - galaxies:Seyfert
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/63621
Collection中国科学院国家天文台
Affiliation1.天津师范大学
2.中国科学院国家天文台
Recommended Citation
GB/T 7714
XiaoYan Chen,CaiNa Hao,Jing Wang. Gaseous versus Stellar Velocity Dispersion in Emission-Line Galaxies[J]. Chinese Astronomy and Astrophysics,2008,8(1):25.
APA XiaoYan Chen,CaiNa Hao,&Jing Wang.(2008).Gaseous versus Stellar Velocity Dispersion in Emission-Line Galaxies.Chinese Astronomy and Astrophysics,8(1),25.
MLA XiaoYan Chen,et al."Gaseous versus Stellar Velocity Dispersion in Emission-Line Galaxies".Chinese Astronomy and Astrophysics 8.1(2008):25.
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