Galaxy and Mass Assembly (GAMA): The stellar mass budget of galaxy spheroids and discs
Galaxy and Mass Assembly (GAMA): The stellar mass budget of galaxy spheroids and discs
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星系和质量组装（GAMA）：星系球体和盘的恒星质量预算
DOI：
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
M. Meyer
中科院分区：
文献类型：
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作者：
A. Moffett;R. Lange;S. Driver;A. Robotham;L. Kelvin;M. Alpaslan;S. Andrews;J. Bland;S. Brough;M. Cluver;M. Colless;L. Davies;B. Holwerda;A. Hopkins;P. Kafle;J. Liske;M. Meyer
我们在最近对7506个星系和质量集合（GAMA）调查星系的光度分解分析的基础上，得出了恒星质量函数对单个球体和盘成分种群的拟合，其质量下限为log(M_*/M_sun)= 8。我们发现单个星系形态类型的球/盘质量分布可以用单个谢克特函数形式很好地描述。我们得出了在球状体（rho_spheroid = 1.24+/-0.49 * 10^8 M_sun Mpc^-3 h_0.7）和盘状体（rho_disk = 1.20+/-0.45 * 10^8 M_sun Mpc^-3 h_0.7）中恒星总质量密度的估计，这意味着在球状体中大约有50%的恒星质量密度，在盘状体中有48%。剩下的恒星质量是在矮星“小蓝色球体”类中发现的，它在结构上与经典的球体或盘状天体都没有明显的相似之处。我们还研究了各组分质量比在星系质量和群晕质量体系中的变化，发现在星系恒星质量~10^11 M_sun和群晕质量~10^12.5 M_sun/h附近发生了从球体到盘状质量优势的转变。我们进一步量化了中心和卫星种群的球体与总质量比与群体晕质量的变化，以及群体内该比率的径向变化。
We build on a recent photometric decomposition analysis of 7506 Galaxy and Mass Assembly (GAMA) survey galaxies to derive stellar mass function fits to individual spheroid and disk component populations down to a lower mass limit of log(M_*/M_sun)= 8. We find that the spheroid/disk mass distributions for individual galaxy morphological types are well described by single Schechter function forms. We derive estimates of the total stellar mass densities in spheroids (rho_spheroid = 1.24+/-0.49 * 10^8 M_sun Mpc^-3 h_0.7) and disks (rho_disk = 1.20+/-0.45 * 10^8 M_sun Mpc^-3 h_0.7), which translates to approximately 50% of the local stellar mass density in spheroids and 48% in disks. The remaining stellar mass is found in the dwarf "little blue spheroid" class, which is not obviously similar in structure to either classical spheroid or disk populations. We also examine the variation of component mass ratios across galaxy mass and group halo mass regimes, finding the transition from spheroid to disk mass dominance occurs near galaxy stellar mass ~10^11 M_sun and group halo mass ~10^12.5 M_sun/h. We further quantify the variation in spheroid-to-total mass ratio with group halo mass for central and satellite populations as well as the radial variation of this ratio within groups.
影响因子：
4.9
作者：
Bundy, Kevin;Bershady, Matthew A.;Zhang, Kai
通讯作者：
Zhang, Kai
盘状星系中的辐射传输 - IV 尘埃衰减对核球和盘状结构参数的影响
DOI：
10.1111/j.1365-2966.2010.16243.x
发表时间：
2010
影响因子：
4.8
作者：
Gadotti;Falony
通讯作者：
Falony