arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1407.7555astro-ph.GA
收藏

星系与质量组合(GAMA):哈勃型恒星质量函数

Galaxy And Mass Assembly (GAMA): Stellar mass functions by Hubble type

Lee S. Kelvin, Simon P. Driver, Aaron S. G. Robotham, Edward N. Taylor, Alister W. Graham, Mehmet Alpaslan, Ivan Baldry, Steven P. Bamford, Amanda E. Bauer, Jos… 展开作者

Lee S. Kelvin, Simon P. Driver, Aaron S. G. Robotham, Edward N. Taylor, Alister W. Graham, Mehmet Alpaslan, Ivan Baldry, Steven P. Bamford, Amanda E. Bauer, Joss Bland-Hawthorn, Michael J. I. Brown, Matthew Colless, Christopher J. Conselice, Benne W. Holwerda, Andrew M. Hopkins, Maritza A. Lara-López, Jochen Liske, Ángel R. López-Sánchez, Jon Loveday, Peder Norberg, Steven Phillipps, Cristina C. Popescu, Matthew Prescott, Anne E. Sansom, Richard J. Tuffs

摘要:

本文给出了局部(0.025 < z < 0.06)宇宙中星系-恒星质量函数的估计及其按形态类型的划分。采用稳健的形态学分类,如前所述(Kelvin等人)对于从星系和质量集合巡天中选取的3,727个星系样本,我们定义了一个局部体积和恒星质量有限的2,711个星系子样本,其恒星质量下限为M = 10^9.0 M_sun。我们证实,星系恒星质量函数可以用一个双谢克特函数很好地描述:M* = 10^10.64 M_sun,α1 =-0.43,δ *1 = 4.18 dex^-1 Mpc^-3,α2 = -1.50,δ *2 = 0.74 dex^-1 Mpc^-3。除了微弱的小蓝色球状体星系外,组成形态型恒星质量函数在我们的恒星质量下限以上都有很好的采样。我们发现,在本地宇宙中,大约71+3-4%的恒星质量存在于以椭球体为主的星系中;椭圆星系和S 0-Sas。剩下的29+4-3%主要属于晚期盘主导系统,Sab-Scds和Sd-Irrs。采用合理的膨胀比意味着今天大约有一半的恒星质量存在于球状结构中,一半存在于盘状结构中。在这个局部样本中,我们发现E:S 0-Sa:Sab-Scd:Sd-Irr的近似恒星质量比例为34:37:24:5。

英文摘要:

We present an estimate of the galaxy stellar mass function and its division by morphological type in the local (0.025 < z < 0.06) Universe. Adopting robust morphological classifications as previously presented (Kelvin et al.) for a sample of 3,727 galaxies taken from the Galaxy And Mass Assembly survey, we define a local volume and stellar mass limited sub-sample of 2,711 galaxies to a lower stellar mass limit of M = 10^9.0 M_sun. We confirm that the galaxy stellar mass function is well described by a double Schechter function given by M* = 10^10.64 M_sun, α1 = -0.43, ϕ*1 = 4.18 dex^-1 Mpc^-3, α2 = -1.50 and ϕ*2 = 0.74 dex^-1 Mpc^-3. The constituent morphological-type stellar mass functions are well sampled above our lower stellar mass limit, excepting the faint little blue spheroid population of galaxies. We find approximately 71+3-4% of the stellar mass in the local Universe is found within spheroid dominated galaxies; ellipticals and S0-Sas. The remaining 29+4-3% falls predominantly within late type disk dominated systems, Sab-Scds and Sd-Irrs. Adopting reasonable bulge-to-total ratios implies that approximately half the stellar mass today resides in spheroidal structures, and half in disk structures. Within this local sample, we find approximate stellar mass proportions for E : S0-Sa : Sab-Scd : Sd-Irr of 34 : 37 : 24 : 5.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑