FRII radio galaxies in the SDSS: Observational facts
FRII radio galaxies in the SDSS: Observational facts
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SDSS 中的 FRII 射电星系：观测事实
DOI：
10.1111/j.1365-2966.2011.18346.x
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
G. Stasi'nska
中科院分区：
文献类型：
--
作者：
D. Kozieł;G. Stasi'nska
从剑桥射电源目录开始，我们创建了401个FRII射电源样本，这些射电源与SDSS第七次数据发布的主星系样本相对应，并分析了它们的射电和光学特性。我们发现Halpha线上的光度与射电光度P1.4GHz密切相关，我们认为Halpha线上的光度比广泛使用的O[III]光度能更好地测量总发射在线通量。我们表明，在大约三分之一的样品中没有发射线可能是由于检测阈值而不是由于缺乏光学活性。我们发现FRII星系的性质主要由Eddington参数LHa/“MBH”或等价的P1.4GHz/“MBH”驱动。具有热点的射电星系在P1.4GHz/“MBH”值最高的星系中被发现。与SDSS主星系样本中的经典AGN宿主相比，我们的FRII星系显示出更大比例的物体具有非常硬的电离辐射场和大的电离参数。相反，一些物体被较软的辐射场电离。我们发现在FRII星系中黑洞质量和恒星质量是密切相关的。SDSS中无线星系的比较样本遵循同样的关系，尽管平均质量更小。这表明，FRII射电现象发生在正常的椭圆星系中，尤其是在质量最大的椭圆星系中。尽管大多数FRII星系都很古老，但其中一些包含了年轻恒星群的痕迹。这样年轻的星系群在正常的无线星系中是看不到的，这表明一些FRII星系的活动可能是由最近的恒星形成引发的。来自SDSS的无线电静音agn的比较样本中的“MBH”-Mgal关系非常不同，这表明仍在形成恒星的星系也仍在形成其中心黑洞。
Starting from the Cambridge Catalogues of radio sources, we have created a sample of 401 FRII radio sources that have counterparts in the main galaxy sample of the 7th Data release of the SDSS and analyse their radio and optical properties. We find that the luminosity in the Halpha line - which we argue gives a better measure of the total emission-line flux than the widely used O[III] luminosity - is strongly correlated with the radio luminosity P1.4GHz. We show that the absence of emission lines in about one third of our sample is likely due to a detection threshold and not to a lack of optical activity. We find that the properties of FRII galaxies are mainly driven by the Eddington parameter LHa/"MBH" or, equivalently, P1.4GHz/"MBH". Radio galaxies with hot spots are found among the ones with the highest values of P1.4GHz/"MBH". Compared to classical AGN hosts in the main galaxy sample of the SDSS, our FRII galaxies show a larger proportion of objects with very hard ionizing radiation field and large ionization parameter. A few objects are, on the contrary, ionized by a softer radiation field. We find that the black hole masses and stellar masses in FRII galaxies are very closely related. A comparison sample of line-less galaxies in the SDSS follows the same relation, although on average the masses are smaller. This suggests that the FRII radio phenomenon occurs in normal elliptical galaxies, preferentially in the most massive ones. Although most FRII galaxies are old, some contain traces of young stellar populations. Such young populations are not seen in normal line-less galaxies, suggesting that the activity in some FRII galaxies may be triggered by recent star formation. The "MBH"-Mgal relation in a comparison sample of radio-quiet AGNs from the SDSS is very different, suggesting that galaxies which are still forming stars are also still building their central black holes.
DOI：
10.1086/516587
发表时间：
2006-12
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
E. Schinnerer;V. Smolčić;C. Carilli;M. Bondi;P. Ciliegi;K. Jahnke;N. Scoville;H. Aussel;F. Bertoldi;A. Blain;C. Impey;A. Koekemoer;O. Fèvre;C. M. U. Mpia;Nrao;-INAF;Caltech;CEASaclay;AIfA;U. Arizona;Stsci;Lam;Yale
通讯作者：
E. Schinnerer;V. Smolčić;C. Carilli;M. Bondi;P. Ciliegi;K. Jahnke;N. Scoville;H. Aussel;F. Bertoldi;A. Blain;C. Impey;A. Koekemoer;O. Fèvre;C. M. U. Mpia;Nrao;-INAF;Caltech;CEASaclay;AIfA;U. Arizona;Stsci;Lam;Yale