The H I mass function and velocity width function of void galaxies in the Arecibo Legacy Fast ALFA Survey

	The H I mass function and velocity width function of void galaxies in the Arecibo Legacy Fast ALFA Survey
	Moorman, Crystal M.1; Vogeley, Michael S.1; Hoyle, Fiona 2; Pan, Danny C.3; Haynes, Martha P.4; Giovanelli, Riccardo 4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2014-11-11
卷号	444 期号:4 页码:3559-3570
关键词	methods: statistical galaxies: distances and redshifts galaxies: luminosity function cosmology: observations large-scale structure of Universe radio lines: galaxies mass function
通讯作者	郝蕾
英文摘要	We measure the HI mass function (HIMF) and velocity width function (WF) across environments over a range of masses, 7.2 < log (M-HI/M-circle dot) < 10.8, and profile widths, 1.3 log (km s(-1)) < log (W) < 2.9 log (km s(-1)), using a catalogue of similar to 7300 HI-selected galaxies from the Arecibo Legacy Fast ALFA (ALFALFA) Survey, located in the region of sky where ALFALFA and Sloan Digital Sky Survey (Data Release 7) North overlap. We divide our galaxy sample into those that reside in large-scale voids (void galaxies) and those that live in denser regions (wall galaxies). We find the void HIMF to be well fitted by a Schechter function with normalization Phi* = (1.37 +/- 0.1) x 10(-2) y h(3) Mpc(-3), characteristic mass log(M-HI/M-circle dot) + 2 log h(70) = 9.86 +/- 0.02, and low-mass-end slope alpha = -1.29 +/- 0.02. Similarly, for wall galaxies, we find best-fitting parameters Phi = (1.82 +/- 0.03) x 10(-2) h(3) Mpc(-3), log(M-H I/M-circle dot) + 2 log h(70) = 10.00 +/- 0.01, and alpha = -1.35 +/- 0.01. We conclude that void galaxies typically have slightly lower HI masses than their non-void counterparts, which is in agreement with the dark matter (DM) halo mass function shift in voids assuming a simple relationship between DM mass and HI mass. We also find that the low-mass slope of the void HIMF is similar to that of the wall HIMF suggesting that there is either no excess of low-mass galaxies in voids or there is an abundance of intermediate HI mass galaxies. We fit a modified Schechter function to the ALFALFA void WF and determine its best-fitting parameters to be Phi = 0.21 +/- 0.1 h(3) Mpc(-3), log (W) = 2.13 +/- 0.3, alpha = 0.52 +/- 0.5, and high-width slope beta = 1.3 +/- 0.4. For wall galaxies, the WF parameters are Phi = 0.022 +/- 0.009 h(3) Mpc(-3), log (W*)= 2.62 +/- 0.5, alpha= -0.64 +/- 0.2, and beta = 3.58 +/- 1.5. Because of large uncertainties on the void and wall WFs, we cannot conclude whether the WF is dependent on the environment.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DIGITAL SKY SURVEY ; 40-PERCENT ALFALFA SURVEY ; LARGE-SCALE STRUCTURE ; VIRGO CLUSTER REGION ; DATA RELEASE 7 ; LUMINOSITY FUNCTION ; REDSHIFT SURVEY ; SOURCE CATALOG ; FIELD GALAXIES ; PHOTOMETRIC PROPERTIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000343400100039
公开日期	2015-02-14
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15748]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA 2.Pontifica Univ Catolica Ecuador, Quito, Ecuador 3.Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Cornell Univ, Ctr Radiophys & Space Res, Ithaca, NY 14853 USA
推荐引用方式 GB/T 7714	Moorman, Crystal M.,Vogeley, Michael S.,Hoyle, Fiona,et al. The H I mass function and velocity width function of void galaxies in the Arecibo Legacy Fast ALFA Survey[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,444(4):3559-3570.
APA	Moorman, Crystal M.,Vogeley, Michael S.,Hoyle, Fiona,Pan, Danny C.,Haynes, Martha P.,&Giovanelli, Riccardo.(2014).The H I mass function and velocity width function of void galaxies in the Arecibo Legacy Fast ALFA Survey.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,444(4),3559-3570.
MLA	Moorman, Crystal M.,et al."The H I mass function and velocity width function of void galaxies in the Arecibo Legacy Fast ALFA Survey".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444.4(2014):3559-3570.