斯皮策无偏超深光谱巡天
A Spitzer Unbiased Ultradeep Spectroscopic Survey
摘要：
我们进行了一个公正的，光谱调查使用低分辨率模块的红外光谱仪（IRS）的斯皮策瞄准两个2.6平方角分区域在GOODS北场。IRS用于光谱映射模式，每个像素的有效积分时间为5小时。一个区域被覆盖在14和21微米之间，另一个区域被覆盖在20和35微米之间。我们提取了45个源的光谱。大约84%的源报告了GOODS在24微米处的探测，中值F_nu（24 μ m）~ 100 uJy。除一个源外，所有四个IRAC波段（3.6至8微米）均检测到。我们使用一种新的互相关技术来测量红移和估计IRS光谱类型;这对约60%的光谱是成功的。14个来源显示出显著的PAH排放，4个主要是SiO吸收，8个存在混合光谱特征（低PAH和/或SiO），2个显示出单一的发射线。对于其余17个，没有检测到光谱特征。红移范围从z ~ 0.2到z ~ 2.2，中值为1。IR亮度是根据24微米通量密度粗略估算的，在z ~ 1和z ~ 2处的中值分别为2.2 x 10^{11} L_{\odot}和7.5 x 10^{11} L_{\odot}。这个样本比以前用IRS观测到的微弱样本有更少的活动星系核，我们把这归因于这里达到的更微弱的光度。
英文摘要：
We carried out an unbiased, spectroscopic survey using the low-resolution module of the infrared spectrograph (IRS) on board Spitzer targeting two 2.6 square arcminute regions in the GOODS-North field. IRS was used in spectral mapping mode with 5 hours of effective integration time per pixel. One region was covered between 14 and 21 microns and the other between 20 and 35 microns. We extracted spectra for 45 sources. About 84% of the sources have reported detections by GOODS at 24 microns, with a median F_nu(24um) ~ 100 uJy. All but one source are detected in all four IRAC bands, 3.6 to 8 microns. We use a new cross-correlation technique to measure redshifts and estimate IRS spectral types; this was successful for ~60% of the spectra. Fourteen sources show significant PAH emission, four mostly SiO absorption, eight present mixed spectral signatures (low PAH and/or SiO) and two show a single line in emission. For the remaining 17, no spectral features were detected. Redshifts range from z ~ 0.2 to z ~ 2.2, with a median of 1. IR Luminosities are roughly estimated from 24 microns flux densities, and have median values of 2.2 x 10^{11} L_{\odot} and 7.5 x 10^{11} L_{\odot} at z ~ 1 and z ~ 2 respectively. This sample has fewer AGN than previous faint samples observed with IRS, which we attribute to the fainter luminosities reached here.
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