An observational and theoretical view of the radial distribution of HI gas in galaxies

	An observational and theoretical view of the radial distribution of HI gas in galaxies
	Wang, Jing 1; Fu, Jian2 ; Aumer, Michael 1,3; Kauffmann, Guinevere 1; Jozsa, Gyula I. G.4,5; Serra, Paolo 6; Huang, Mei-ling 1; Brinchmann, Jarle 7; van der Hulst, Thijs 8; Bigiel, Frank 9
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2014-07-01
卷号	441 期号:3 页码:2159-2172
关键词	galaxies: evolution galaxies: ISM galaxies: spiral
通讯作者	富坚
英文摘要	We analyse the radial distribution of H i gas for 23 disc galaxies with unusually high H i content from the Bluedisk sample, along with a similar-sized sample of 'normal' galaxies. We propose an empirical model to fit the radial profile of the H i surface density, an exponential function with a depression near the centre. The radial H i surface density profiles are very homogeneous in the outer regions of the galaxy; the exponentially declining part of the profile has a scalelength of similar to 0.18 R1, where R1 is the radius where the column density of the H i is 1 M-aS (TM) pc(-2). This holds for all galaxies, independent of their stellar or H i mass. The homogenous outer profiles, combined with the limited range in H i surface density in the non-exponential inner disc, results in the well-known tight relation between H i size and H i mass. By comparing the radial profiles of the H i-rich galaxies with those of the control systems, we deduce that in about half the galaxies, most of the excess gas lies outside the stellar disc, in the exponentially declining outer regions of the H i disc. In the other half, the excess is more centrally peaked. We compare our results with existing smoothed particle hydrodynamical simulations and semi-analytic models of disc galaxy formation in a I > cold dark matter universe. Both the hydro simulations and the semi-analytic models reproduce the H i surface density profiles and the H i size-mass relation without further tuning of the simulation and model inputs. In the semi-analytic models, the universal shape of the outer H i radial profiles is a consequence of the assumption that infalling gas is always distributed exponentially.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	VIRGO CLUSTER GALAXIES ; IRREGULAR GALAXIES ; NEUTRAL HYDROGEN ; SPIRAL GALAXIES ; DISK GALAXIES ; NEARBY GALAXIES ; LOCAL UNIVERSE ; DATA RELEASE ; EVOLUTION ; ATLAS
收录类别	SCI
语种	英语
WOS记录号	WOS:000338763600025
公开日期	2015-02-14
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15864]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Max Planck Inst Astrophys, D-85741 Garching, Germany 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Excellence Cluster Universe, D-85748 Garching, Germany 4.Netherlands Inst Radio Astron ASTRON, NL-7990 AA Dwingeloo, Netherlands 5.Argelander Inst Astron, D-53121 Bonn, Germany 6.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, Epping, NSW 1710, Australia 7.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands 8.Univ Groningen, Kapteyn Astron Inst, NL-9747 AD Groningen, Netherlands 9.Heidelberg Univ, Zentrum Astron, Inst Theoret Astrophys, D-69120 Heidelberg, Germany
推荐引用方式 GB/T 7714	Wang, Jing,Fu, Jian,Aumer, Michael,et al. An observational and theoretical view of the radial distribution of HI gas in galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,441(3):2159-2172.
APA	Wang, Jing.,Fu, Jian.,Aumer, Michael.,Kauffmann, Guinevere.,Jozsa, Gyula I. G..,...&Bigiel, Frank.(2014).An observational and theoretical view of the radial distribution of HI gas in galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,441(3),2159-2172.
MLA	Wang, Jing,et al."An observational and theoretical view of the radial distribution of HI gas in galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 441.3(2014):2159-2172.