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arXiv 1705.04074astro-ph.GA
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星系与质量组合(GAMA):从r波段选择的赤道区的星系恒星质量函数到$z=0.1$

Galaxy And Mass Assembly (GAMA): The galaxy stellar mass function to $z=0.1$ from the r-band selected equatorial regions

A. H. Wright, A. S. G. Robotham, S. P. Driver, M. Alpaslan, S. K. Andrews, I. K. Baldry, J. Bland-Hawthorn S. Brough, M. J. I. Brown, M. Colless, E. da Cunha, L… 展开作者

A. H. Wright, A. S. G. Robotham, S. P. Driver, M. Alpaslan, S. K. Andrews, I. K. Baldry, J. Bland-Hawthorn S. Brough, M. J. I. Brown, M. Colless, E. da Cunha, L. J. M. Davies, Alister W. Graham, B. W. Holwerda, A. M. Hopkins, P. R. Kafle, L. S. Kelvin, J. Loveday, S. J. Maddox, M. J. Meyer, A. J. Moffett, P. Norberg, S. Phillipps, K. Rowlands, E. N. Taylor, L. Wang, S. M. Wilkins

摘要:

我们推导出低红移星系恒星质量函数(GSMF),包括尘埃校正,赤道星系和质量大会(GAMA)数据集覆盖180度$^2$。我们构造的质量函数使用密度校正的最大体积法,使用质量校正光学厚和薄的灰尘的影响。我们探讨了银河系的二元亮度平面($M_\star-μ$),表明表面亮度效应不系统地偏置我们的质量函数测量高于10 $^{7.5}$ M $_{\odot}$。在$M-μ$平面的星系分布似乎有很好的界限,这表明没有大量的人口,但扩散或高度紧凑的星系系统错过了由于GAMA的选择标准。GSMF是双Schechter函数,具有$\mathcal M^\star=10^{10.78\pm0.01\pm0.20}M_\odot$、$ϕ^\star_1=(2.93\pm0.40)\times10^{-3}h_{70}^3$ Mpc $^{-3}$、$α_1=-0.62\pm0.03\pm0.15$、$ϕ^\star_2=(0.63\pm0.10)\times10^{-3}h_{70}^3$ Mpc $^{-3}$和$α_2=-1.50\pm0.01\pm0.15$。虽然我们发现$\mathcal M^\star$的值更高,但我们发现与先前使用GAMA-I样本估计的相同的暗端斜率。使用完整的GAMA-II样品,我们能够将质量函数拟合到低至$10^{7.5}$ $M_\odot$的质量,并评估$10^{6.5}$ $M_\odot$的限值。结合GAMA-II与G10-COSMOS的数据,我们能够定性地评论GSMF的形状,质量低至$10^{6}$ $M_\odot$。除了在$10^{9.5}$的GSMF中看到的众所周知的上升之外,从$10^9$到$10^{6.5}$,分布似乎保持单一的幂律斜率。我们计算的恒星质量密度参数给出我们的最佳估计GSMF,发现$Ω_\star= 1.66^{+0.24}_{-0.23}\pm0.97 h^{-1}_{70} \times 10^{-3}$,包括随机和系统的不确定性。

英文摘要:

We derive the low redshift galaxy stellar mass function (GSMF), inclusive of dust corrections, for the equatorial Galaxy And Mass Assembly (GAMA) dataset covering 180 deg$^2$. We construct the mass function using a density-corrected maximum volume method, using masses corrected for the impact of optically thick and thin dust. We explore the galactic bivariate brightness plane ($M_\star-μ$), demonstrating that surface brightness effects do not systematically bias our mass function measurement above 10$^{7.5}$ M$_{\odot}$. The galaxy distribution in the $M-μ$-plane appears well bounded, indicating that no substantial population of massive but diffuse or highly compact galaxies are systematically missed due to the GAMA selection criteria. The GSMF is {fit with} a double Schechter function, with $\mathcal M^\star=10^{10.78\pm0.01\pm0.20}M_\odot$, $ϕ^\star_1=(2.93\pm0.40)\times10^{-3}h_{70}^3$Mpc$^{-3}$, $α_1=-0.62\pm0.03\pm0.15$, $ϕ^\star_2=(0.63\pm0.10)\times10^{-3}h_{70}^3$Mpc$^{-3}$, and $α_2=-1.50\pm0.01\pm0.15$. We find the equivalent faint end slope as previously estimated using the GAMA-I sample, although we find a higher value of $\mathcal M^\star$. Using the full GAMA-II sample, we are able to fit the mass function to masses as low as $10^{7.5}$ $M_\odot$, and assess limits to $10^{6.5}$ $M_\odot$. Combining GAMA-II with data from G10-COSMOS we are able to comment qualitatively on the shape of the GSMF down to masses as low as $10^{6}$ $M_\odot$. Beyond the well known upturn seen in the GSMF at $10^{9.5}$ the distribution appears to maintain a single power-law slope from $10^9$ to $10^{6.5}$. We calculate the stellar mass density parameter given our best-estimate GSMF, finding $Ω_\star= 1.66^{+0.24}_{-0.23}\pm0.97 h^{-1}_{70} \times 10^{-3}$, inclusive of random and systematic uncertainties.

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