Estimating the H i gas fractions of galaxies in the local Universe

	Estimating the H i gas fractions of galaxies in the local Universe
	Zhang, Wei1 ; Li, Cheng 2,3; Kauffmann, Guinevere 2; Zou, Hu1 ; Catinella, Barbara 2; Shen, Shiyin 3; Guo, Qi2 ; Chang, Ruixiang 3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2009-08-11
卷号	397 期号:3 页码:1243-1253
关键词	galaxies: clusters: general galaxies: distances and redshifts cosmology: theory dark matter large-scale structure of Universe
英文摘要	We use a sample of 800 galaxies with H i mass measurements from the HyperLeda catalogue and optical photometry from the fourth data release of the Sloan Digital Sky Survey (SDSS) to calibrate a new photometric estimator of the H i-to-stellar-mass ratio for nearby galaxies. Our estimator, which is motivated by the Kennicutt-Schmidt star formation law, is log(10)(G(H i)/S) = -1.732 38(g - r) + 0.215 182 mu(i) - 4.084 51, where mu(i) is the i-band surface brightness and g - r is the optical colour estimated from the g- and r-band Petrosian apparent magnitudes. This estimator has a scatter of Sigma = 0.31 dex in log (G(H i)/S), compared to Sigma similar to 0.4 dex for previous estimators that were based on colour alone. We investigate whether the residuals in our estimate of log (G(H i)/S) depend in a systematic way on a variety of different galaxy properties. We find no effect as a function of stellar mass or 4000 A break strength, but there is a systematic effect as a function of the concentration index of the light. We then apply our estimator to a sample of 10(5) emission-line galaxies in the SDSS Data Release 4 (DR4) and derive an estimate of the H i mass function, which is in excellent agreement with recent results from H i blind surveys. Finally, we re-examine the well-known relation between gas-phase metallicity and stellar mass, and ask whether there is a dependence on H i-to-stellar-mass ratio, as predicted by chemical evolution models. We do find that gas-poor galaxies are more metal rich at fixed stellar mass. We compare our results with the semi-analytic models of De Lucia & Blaizot, which include supernova feedback, as well as the cosmological infall of gas.
收录类别	SCI
语种	英语
WOS记录号	WOS:000268459900007
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7590]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Max Planck Inst Astrophys, D-85748 Garching, Germany 3.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Wei,Li, Cheng,Kauffmann, Guinevere,et al. Estimating the H i gas fractions of galaxies in the local Universe[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,397(3):1243-1253.
APA	Zhang, Wei.,Li, Cheng.,Kauffmann, Guinevere.,Zou, Hu.,Catinella, Barbara.,...&Chang, Ruixiang.(2009).Estimating the H i gas fractions of galaxies in the local Universe.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,397(3),1243-1253.
MLA	Zhang, Wei,et al."Estimating the H i gas fractions of galaxies in the local Universe".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 397.3(2009):1243-1253.