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本星系8微米光度函数

The Local Galaxy 8 micron Luminosity Function

J. -S. Huang, M. L. N. Ashby, P. Barmby, M. Brodwin, M. J. I. Brown, N. Caldwell, R. J. Cool, P. Eisenhardt, D. Eisenstein, G. G. Fazio, E. Le Floc'h, P. Green,… 展开作者

J. -S. Huang, M. L. N. Ashby, P. Barmby, M. Brodwin, M. J. I. Brown, N. Caldwell, R. J. Cool, P. Eisenhardt, D. Eisenstein, G. G. Fazio, E. Le Floc'h, P. Green, C. S. Kochanek, N. Y. Lu, M. A. Pahre, D. Rigopoulou, J. L. Rosenberg, H. A. Smith, Z. Wang, C. N. A. Willmer, S. P. Willner

备注：
32 pages, 12 Figures (Fig. 1, Fig. 2, and Fig. 4 are JPEG files), accepted for publication in ApJ
发表信息：
Astrophys.J.664:840-849,2007
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摘要：

位于牧夫座的NOAO深宽视场的SST调查提供了一个完整的8微米选择的星系样本，其极限（织女星）星等为13.5。在6.88度的$^2$场采样中，4867个星系中有79%的星系有光谱红移，这使得可以精确地确定本地（z<0.3）星系光度函数。恒星和尘埃辐射可以根据观测到的星系颜色来区分。尘埃辐射（主要是PAH）占8微米光度的80%，恒星光球占19%，活动星系核辐射约占1%。8微米选定星系的子样本具有蓝色，早期类型的颜色，但即使是其中大多数也有显着的PAH排放。总的8微米光度和单独的尘埃排放的光度函数都很好地拟合Schechter函数。对于8微米光度函数，特征光度为νL_ν^*（8.0 \micron）= 1.8 \times 10^{10} $ \Lsun while for the dust emission alone it is 1.6 x 10^{10}$ \Lsun \null。在z<0.3时，8个\micron的平均光度密度为3.1 x 10^7 \Lsun Mpc^{-3}，而仅来自尘埃的平均光度密度为2.5 x 10^7 \Lsun Mpc^{-3}。这种光度主要来自具有8个\micron光度（$νL_ν$）的星系，介于$2\times 10^9$和$2 x 10^{10}$ \Lsun之间，即，而不是LIRGs或ULIRGs。

英文摘要：

A SST survey in the NOAO Deep-Wide Field in Boötes provides a complete, 8-micron-selected sample of galaxies to a limiting (Vega) magnitude of 13.5. In the 6.88 deg$^2$ field sampled, 79% of the 4867 galaxies have spectroscopic redshifts, allowing an accurate determination of the local (z<0.3) galaxy luminosity function. Stellar and dust emission can be separated on the basis of observed galaxy colors. Dust emission (mostly PAH) accounts for 80% of the 8 micron luminosity, stellar photospheres account for 19%, and AGN emission accounts for roughly 1 %. A sub-sample of the 8 micron-selected galaxies have blue, early-type colors, but even most of these have significant PAH emission. The luminosity functions for the total 8 micron luminosity and for the dust emission alone are both well fit by Schechter functions. For the 8 micron luminosity function, the characteristic luminosity is νL_ν^*(8.0 \micron) = 1.8 \times 10^{10}$ \Lsun while for the dust emission alone it is 1.6 x 10^{10}$ \Lsun\null. The average 8 \micron luminosity density at z<0.3 is 3.1 x 10^7 \Lsun Mpc^{-3}, and the average luminosity density from dust alone is 2.5 x 10^7 \Lsun Mpc^{-3}. This luminos ity arises predominantly from galaxies with 8 \micron luminosities ($νL_ν$) between $2\times 10^9$ and $2 x 10^{10}$ \Lsun, i.e., normal galaxies, not LIRGs or ULIRGs.

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