期刊
ASTROPHYSICAL JOURNAL
卷 779, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/779/1/87
关键词
galaxies: halos; quasars: absorption lines
资金
- NASA's Space Telescope Science Institute [HST-GO-12252]
- NASA [NAS 5-26555]
- NASA New Mexico Space Grant Consortium (NMSGC) Research Enhancement Grant
- NMSGC Graduate Fellowship
- three-year Graduate Research Enhancement Grant (GREG)
- Office of the Vice President for Research at New Mexico State University
In Churchill et al., we used halo abundance matching applied to 182 galaxies in the Mg II Absorber-Galaxy Catalog (MAGIICAT) and showed that the mean Mg II gamma 2796 equivalent width follows a tight inverse-square power law, W-r(2796) proportional to (D/R-vir) (2), with projected location relative to the galaxy virial radius and that the Mg II absorption covering fraction is effectively invariant with galaxy virial mass, M-h, over the range 10.7 <= log M-h/M-circle dot <= 13.9. In this work, we explore multivariate relationships between W-r(2796), virial mass, impact parameter, virial radius, and the theoretical cooling radius that further elucidate self-similarity in the cool/warm (T = 10(4)-10(4.5) K) circumgalactic medium (CGM) with virial mass. We show that virial mass determines the extent and strength of the Mg II absorbing gas such that the mean W-r(2796) increases with virial mass at fixed distance while decreasing with galactocentric distance for fixed virial mass. The majority of the absorbing gas resides within D similar or equal to 0.3 R-vir, independent of both virial mass and minimum absorption threshold; inside this region, and perhaps also in the region 0.3 < D/R-vir <= 1, the mean W-r(2796) is independent of virial mass. Contrary to absorber-galaxy cross-correlation studies, we show there is no anti-correlation between W-r(2796) and virial mass. We discuss how simulations and theory constrained by observations support self-similarity of the cool/warm CGM via the physics governing star formation, gas-phase metal enrichment, recycling efficiency of galactic scale winds, filament and merger accretion, and overdensity of local environment as a function of virial mass.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据