论文标题
当地宇宙中的红外检测AGN
Infrared-detected AGNs in the Local Universe
论文作者
论文摘要
Spitzer/IRAC颜色选择是一种有前途的技术，可以识别出星系中的热吸收核，即AGN。我们使用一小部分Sauron星系来证明这一点，并进一步探讨这一点。这项研究的目的是找到一种简单有效的方法来揭示（附近）星系中光学遮盖的核积聚。我们将红外选择方法应用于对2500多个星系的星系（S4G）样品中的恒星结构的Spitzer调查，以及其400多个星系的扩展样品。我们使用Spitzer颜色在包含热核的S $^{4} $ G调查中找到星系，表明存在强大的AGN，并研究检测部分作为形态类型的函数。我们通过使用VLA NVSS和第一次调查来检查星系的无线电特性来测试这种红外颜色选择方法。使用无线电数据，我们证明了显示热中红外核的星系是（候选）主动星系。当使用较低空间分辨率的任务中的颜色而不是Spitzer时，我们将重现这些结果。因此，多波段红外成像代表了发现星系中光学遮挡的核活动的有用工具。
Spitzer/IRAC color selection is a promising technique to identify hot accreting nuclei, that is to say AGN, in galaxies. We demonstrate this using a small sample of SAURON galaxies, and explore this further. The goal of this study is to find a simple and efficient way to reveal optically obscured nuclear accretion in (nearby) galaxies. We apply an infrared selection method to the Spitzer Survey of Stellar Structures in Galaxies (S4G) sample of more than 2500 galaxies, together with its extension sample of more than 400 galaxies. We use the Spitzer colors to find galaxies in the S$^{4}$G survey containing a hot core, suggesting the presence of a strong AGN, and study the detection fraction as a function of morphological type. We test this infrared color selection method by examining the radio properties of the galaxies, using the VLA NVSS and FIRST surveys. Using the radio data, we demonstrate that galaxies displaying hot mid-infrared nuclei stand out as being (candidate) active galaxies. When using, instead of Spitzer, colors from the lower spatial resolution WISE mission, we reproduce these results. Hence multi-band infrared imaging represents a useful tool to uncover optically obscured nuclear activity in galaxies.
