XiaoYan Chen1; CaiNa Hao1; Jing Wang2
Source Publicationchinesejournalofastronomyandastrophysics
AbstractWe compare the ionized gas velocity dispersion sigma(gas) with the stellar velocity dispersion sigma(*) 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 sigma(gas) from the FWHMs of emission lines (H alpha, NIIlambda lambda 6548, 6583 and SIIlambda lambda 6716, 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 velocity 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 (sigma) over bar gas/sigma* as a function of the redshift and the axial ratio to test the effects of aperture and galaxy inclination, and found that both effects are weak. Finally we checked the trend of (sigma) over bar gas/sigma* with the infrared luminosity and found no significant correlation.
Document Type期刊论文
Affiliation1.Tianjin Astrophysics Center,Tianjin Normal University
Recommended Citation
GB/T 7714
XiaoYan Chen,CaiNa Hao,Jing Wang. gaseousversusstellarvelocitydispersioninemissionlinegalaxies[J]. chinesejournalofastronomyandastrophysics,2008,8(1):25.
APA XiaoYan Chen,CaiNa Hao,&Jing Wang.(2008).gaseousversusstellarvelocitydispersioninemissionlinegalaxies.chinesejournalofastronomyandastrophysics,8(1),25.
MLA XiaoYan Chen,et al."gaseousversusstellarvelocitydispersioninemissionlinegalaxies".chinesejournalofastronomyandastrophysics 8.1(2008):25.
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