FRICAT: A FIRST catalog of FRI radio galaxies
FRICAT: A FIRST catalog of FRI radio galaxies
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DOI：
10.1051/0004-6361/201629287
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发表时间：
2016-10
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影响因子：
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通讯作者：
A. Capetti;F. Massaro;R. D. Baldi
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作者：
A. Capetti;F. Massaro;R. D. Baldi
我们建立了一个包含219个FRI射电星系（FRI）的目录，称为FRICAT，从已公布的样本中选出，并通过结合NVSS，FIRST和SDSS调查的观测获得。我们包括在目录中的来源与边缘变暗的无线电形态，红移0.15，并延伸（在第一图像的灵敏度）到半径r$大于30千秒差距的主机中心。我们还选择了14个较小（10 $<r<$30 kpc）FRI的额外样本（sFRICAT），限制为$z<0.05$。FRICAT源的宿主都是明亮的（$-21 \gtrsim M_r \gtrsim-24 $）红色早型星系，黑洞质量在$10^8 \lesssim M_{\rm BH} \lesssim 3\times10^9 M_\odot$范围内;基于光发射线比的光谱分类表明它们都是低激发星系。根据其光学性质，FRICAT中的源与属于第三剑桥射电源目录（3C）的FRI无法区分。相反，虽然3C-FRI在射电和[OIII]发射线光度之间显示出强烈的正趋势，但在FRICAT源中，这两个量是不相关的;在给定的线亮度下，它们的射电光度跨度约为两个数量级，射电和线功率之间的比值比3C-FRI低得多。我们的主要结论是，3C-FRI的射电光度比3C-FRI的射电光度大得多。FRI只是更大和更多样化的FRI群体的冰山一角。
We built a catalog of 219 FRI radio galaxies (FRIs), called FRICAT, selected from a published sample and obtained by combining observations from the NVSS, FIRST, and SDSS surveys. We included in the catalog the sources with an edge-darkened radio morphology, redshift $\leq 0.15$, and extending (at the sensitivity of the FIRST images) to a radius $r$ larger than 30 kpc from the center of the host. We also selected an additional sample (sFRICAT) of 14 smaller (10 $<r<$ 30 kpc) FRIs, limiting to $z<0.05$. The hosts of the FRICAT sources are all luminous ($-21 \gtrsim M_r \gtrsim -24$), red early-type galaxies with black hole masses in the range $10^8 \lesssim M_{\rm BH} \lesssim 3\times10^9 M_\odot$; the spectroscopic classification based on the optical emission line ratios indicates that they are all low excitation galaxies. Sources in the FRICAT are then indistinguishable from the FRIs belonging to the Third Cambridge Catalogue of Radio Sources (3C) on the basis of their optical properties. Conversely, while the 3C-FRIs show a strong positive trend between radio and [OIII] emission line luminosity, these two quantities are unrelated in the FRICAT sources; at a given line luminosity, they show radio luminosities spanning about two orders of magnitude and extending to much lower ratios between radio and line power than 3C-FRIs. Our main conclusion is that the 3C-FRIs just represent the tip of the iceberg of a much larger and diverse population of FRIs.