论文标题
识别无线电式银河系中的无线电核核
Identifying radio active galactic nuclei among radio-emitting galaxies
论文作者
论文摘要
基于我们对Rogue I的分析，这是一个与光学星系相关的超过32,000个无线电源的目录，我们提供了两个诊断，以选择由于有效的银河系核（AGN）引起的无线电发射的星系。这些诊断中的每一个都可以独立应用。第一个被称为mirad，比较了明智望远镜的$ W3 $中红外乐队中的通量$ f_ {w3} $，而无线电通量为1.4 GHz，$ \ frad $。 mirad不需要光谱。第二个被称为DLM的诊断与4000Å的突破强度有关，$ d _ {\ rm n}（4000）$，每单位恒星质量的无线电发光度。 DLM图在过去已经使用过，但不是独立的。对于这两个图，我们提出了简单的，经验的分界线，从而导致共同对象相同的分类。这些线正确分类为流氓〜I目录中的99.5％的扩展无线电来源，并将恒星形成（SF）星系98--99％通过其发射线比例确定为这样的星系。这两个图清楚地表明，无线电在椭圆星系和托有最大黑洞的星系中优先找到。在Mirad或DLM图中归类为无线电的大多数无线电来源是光学弱的AGN或退休的星系。
Basing our analysis on ROGUE I, a catalog of over 32,000 radio sources associated with optical galaxies, we provide two diagnostics to select the galaxies where the radio emission is due to an active galactic nucleus (AGN). Each of these diagnostics can be applied independently. The first one, dubbed MIRAD, compares the flux $F_{W3}$ in the $W3$ mid-infrared band of the WISE telescope, with the radio flux at 1.4 GHz, $\Frad$. MIRAD requires no optical spectra. The second diagnostic, dubbed DLM, relates the 4000 Å break strength, $D_{\rm n}(4000)$, with the radio luminosity per unit stellar mass. The DLM diagram has already been used in the past, but not as standalone. For these two diagrams, we propose simple, empirical dividing lines that result in the same classification for the objects in common. These lines correctly classify as radio-AGN 99.5 percent of the extended radio sources in the ROGUE~I catalog, and as star-forming (SF) galaxies 98--99 percent of the galaxies identified as such by their emission line ratios. Both diagrams clearly show that radio AGNs are preferentially found among elliptical galaxies and among galaxies hosting the most massive black holes. Most of the radio sources classified as radio-AGNs in the MIRAD or DLM diagrams are either optically weak AGNs or retired galaxies.
