红色序列中静止半导体的中红外和近紫外过量发射
The Mid-Infrared and Near-Ultraviolet Excess Emissions of Quiescent Galaxies on the Red Sequence
摘要：
我们研究了光谱选择的静止星系的光学红序列的中红外（IR）和近紫外（UV）的过量发射。我们使用宽视场红外巡天探测器（{ \it WISE}）的中红外和星系演化探测器（{ \it GALEX}）的近紫外数据的光谱样本的星系在斯隆数字巡天数据释放7研究静止的红色序列星系之间的可能的连接，没有中红外/近紫外过剩。在648个12 $μ$ m的静止红序星系中，没有H $α$发射，分别有26%和55%的近紫外和中红外过量发射。当我们只考虑明亮的（$M_{r}$ $<$ $-$ 21.5）星系的早期型形态，最近的恒星形成的星系的比例仍然是39%。具有中红外和近紫外过量辐射的静止红序列星系在光学上较暗，并且比没有中红外和近紫外过量辐射的星系具有略小的$D_{n}$ 4000。我们还发现，中红外加权平均恒星年龄的静态红序列星系的中红外过剩大于那些与近紫外过剩，小于那些没有中红外和近紫外过剩。的环境依赖的部分静止的红序列星系与中红外和近紫外线过剩似乎很强，即使静止的红序列星系与近紫外线过剩的趋势与中红外过剩的不同。这些结果表明，最近的恒星形成跟踪近紫外（$\lesssim 1$陀螺仪）和中红外（$\lesssim 2$陀螺仪）过剩是不可忽略的附近，静态，红色，早型星系。我们提出了一个可能的演化方案的静态红序列星系从静态红序列星系与近紫外过剩的中红外过剩的那些没有近紫外和中红外过剩。
英文摘要：
We study the mid-infrared (IR) and near-ultraviolet (UV) excess emissions of spectroscopically selected quiescent galaxies on the optical red sequence. We use the Wide-field Infrared Survey Explorer ({\it WISE}) mid-IR and Galaxy Evolution Explorer ({\it GALEX}) near-UV data for a spectroscopic sample of galaxies in the Sloan Digital Sky Survey Data Release 7 to study the possible connection between quiescent red-sequence galaxies with and without mid-IR/near-UV excess. Among 648 12 $μ$m detected quiescent red-sequence galaxies without H$α$ emission, 26% and 55% show near-UV and mid-IR excess emissions, respectively. When we consider only bright ($M_{r}$ $<$ $-$21.5) galaxies with early-type morphology, the fraction of galaxies with recent star formation is still 39%. The quiescent red-sequence galaxies with mid-IR and near-UV excess emissions are optically fainter and have slightly smaller $D_{n}$4000 than those without mid-IR and near-UV excess emissions. We also find that mid-IR weighted mean stellar ages of quiescent red-sequence galaxies with mid-IR excess are larger than those with near-UV excess, and smaller than those without mid-IR and near-UV excess. The environmental dependence of the fraction of quiescent red-sequence galaxies with mid-IR and near-UV excess seems strong even though the trends of quiescent red-sequence galaxies with near-UV excess differ from those with mid-IR excess. These results indicate that the recent star formation traced by near-UV ($\lesssim 1$ Gyr) and mid-IR ($\lesssim 2$ Gyr) excess is not negligible among nearby, quiescent, red, early-type galaxies. We suggest a possible evolutionary scenario of quiescent red-sequence galaxies from quiescent red-sequence galaxies with near-UV excess to those with mid-IR excess to those without near-UV and mid-IR excess.
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