Measures of galaxy environment - I. What is 'environment'?

	Measures of galaxy environment - I. What is 'environment'?
	Muldrew, Stuart I.1; Croton, Darren J.2; Skibba, Ramin A.3; Pearce, Frazer R.1; Ann, Hong Bae 4; Baldry, Ivan K.5; Brough, Sarah 6; Choi, Yun-Young 7; Conselice, Christopher J.1; Cowan, Nicolas B.8
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2012
卷号	419 期号:3 页码:2670-2682
关键词	methods: numerical methods: statistical galaxies: evolution galaxies: haloes dark matter large-scale structure of Universe
英文摘要	The influence of a galaxys environment on its evolution has been studied and compared extensively in the literature, although differing techniques are often used to define environment. Most methods fall into two broad groups: those that use nearest neighbours to probe the underlying density field and those that use fixed apertures. The differences between the two inhibit a clean comparison between analyses and leave open the possibility that, even with the same data, different properties are actually being measured. In this work, we apply 20 published environment definitions to a common mock galaxy catalogue constrained to look like the local Universe. We find that nearest-neighbour-based measures best probe the internal densities of high-mass haloes, while at low masses the interhalo separation dominates and acts to smooth out local density variations. The resulting correlation also shows that nearest-neighbour galaxy environment is largely independent of dark matter halo mass. Conversely, aperture-based methods that probe superhalo scales accurately identify high-density regions corresponding to high-mass haloes. Both methods show how galaxies in dense environments tend to be redder, with the exception of the largest apertures, but these are the strongest at recovering the background dark matter environment. We also warn against using photometric redshifts to define environment in all but the densest regions. When considering environment, there are two regimes: the local environment internal to a halo best measured with nearest neighbour and large-scale environment external to a halo best measured with apertures. This leads to the conclusion that there is no universal environment measure and the most suitable method depends on the scale being probed.
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 ; DARK-MATTER HALOES ; EMISSION-LINE SURVEY ; SDSS REDSHIFT SURVEY ; STAR-FORMATION ; STELLAR MASS ; LUMINOSITY FUNCTION ; OCCUPATION DISTRIBUTION ; COLOR DEPENDENCE ; CLUSTER GALAXIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000298844300063
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18107]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England 2.Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia 3.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA 4.Pusan Natl Univ, Div Sci Educ, Pusan 609735, South Korea 5.Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England 6.Australian Astron Observ, Epping, NSW 1710, Australia 7.Kyung Hee Univ, Dept Astron & Space Sci, Gyeonggi 446701, South Korea 8.Northwestern Univ, Dearborn Observ, Evanston, IL 60208 USA 9.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark 10.Korea Inst Adv Study, Seoul 130722, South Korea
推荐引用方式 GB/T 7714	Muldrew, Stuart I.,Croton, Darren J.,Skibba, Ramin A.,et al. Measures of galaxy environment - I. What is 'environment'?[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,419(3):2670-2682.
APA	Muldrew, Stuart I..,Croton, Darren J..,Skibba, Ramin A..,Pearce, Frazer R..,Ann, Hong Bae.,...&Zibetti, Stefano.(2012).Measures of galaxy environment - I. What is 'environment'?.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,419(3),2670-2682.
MLA	Muldrew, Stuart I.,et al."Measures of galaxy environment - I. What is 'environment'?".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 419.3(2012):2670-2682.