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arXiv 1111.5707astro-ph.CO
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星系与质量组合(GAMA):z < 0.06时的星系恒星质量函数

Galaxy And Mass Assembly (GAMA): The galaxy stellar mass function at z < 0.06

I. K. Baldry, S. P. Driver, J. Loveday, E. N. Taylor, L. S. Kelvin, J. Liske, P. Norberg, A. S. G. Robotham, S. Brough, A. M. Hopkins, S. P. Bamford, J. A. Peac… 展开作者

I. K. Baldry, S. P. Driver, J. Loveday, E. N. Taylor, L. S. Kelvin, J. Liske, P. Norberg, A. S. G. Robotham, S. Brough, A. M. Hopkins, S. P. Bamford, J. A. Peacock, J. Bland-Hawthorn, C. J. Conselice, S. M. Croom, D. H. Jones, H. R. Parkinson, C. C. Popescu, M. Prescott, R. G. Sharp, R. J. Tuffs

摘要:

我们利用星系与质量集合体(GAMA)巡天前三年的143度^[2]区域确定了低红移场星系恒星质量函数(GSMF)。这次红移测量的星等极限是三分之二的区域r < 19.4等,三分之一的区域r <19.8等。GSMF是从5210个星系的样本使用密度校正的最大体积方法确定的。这有效地克服了数密度与红移之间的波动问题。当H_0 = 70时,GSMF在10^8 ~ 10^11.5 Msun之间可以用双谢克特函数很好地描述,其中质量^* = 10^10.66 Msun,φ_1 ^* = 3.96 x 10^-3 Mpc^-3,α_1 =-0.35,φ_2 ^* = 0.79 x 10^-3 Mpc^-3,α_2 =-1.47。这一结果对于流动模型修正的红移的不确定性比来自较浅的斯隆数字巡天主样本(r < 17.8等)的结果更鲁棒。GSMF的上升也可以直接在i波段和K波段星系光度函数中看到。在GAMA测量体积内精确测量低于10^8兆太阳的GSMF是可能的,但正如预期的那样,需要更深的成像数据来解决低表面亮度星系的贡献。

英文摘要:

We determine the low-redshift field galaxy stellar mass function (GSMF) using an area of 143 deg^2 from the first three years of the Galaxy And Mass Assembly (GAMA) survey. The magnitude limits of this redshift survey are r < 19.4 mag over two thirds and 19.8 mag over one third of the area. The GSMF is determined from a sample of 5210 galaxies using a density-corrected maximum volume method. This efficiently overcomes the issue of fluctuations in the number density versus redshift. With H_0 = 70, the GSMF is well described between 10^8 and 10^11.5 Msun using a double Schechter function with mass^* = 10^10.66 Msun, phi_1^* = 3.96 x 10^-3 Mpc^-3, alpha_1 = -0.35, phi_2^* = 0.79 x 10^-3 Mpc^-3 and alpha_2 = -1.47. This result is more robust to uncertainties in the flow-model corrected redshifts than from the shallower Sloan Digital Sky Survey main sample (r < 17.8 mag). The upturn in the GSMF is also seen directly in the i-band and K-band galaxy luminosity functions. Accurately measuring the GSMF below 10^8 Msun is possible within the GAMA survey volume but as expected requires deeper imaging data to address the contribution from low surface-brightness galaxies.

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