arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1201.4401astro-ph.CO
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是什么让银河系的收音机如此响亮?

What makes a galaxy radio-loud?

R. A. Ortega-Minakata, J. P. Torres-Papaqui, H. Andernach, R. Coziol, J. M. Islas-Islas, I. Plauchu-Frayn, D. M. Neri-Larios, M. del C. Rojas-Granados

摘要:

本文用SDSS对射电强活动星系核(RLAGNs)、低亮度活动星系核(LLAGNs)和孤立星系活动星系核(IG-AGN)进行了观测,比较了它们的光谱能量分布。所有这些星系都具有相似的光谱特征。RLAGN的中位SED与类星体的特征SED一致,而LLAGN和IG-AGN的中位SED与LINER的SED一致,IG-AGN的亮度低于LLAGN。我们从凸起质量推断出黑洞的质量。这些从IG-AGN到LLAGN增加,并在RLAGN中最高。所有这些活动星系核的吸积率都接近或略低于爱丁顿极限的10%,光度的差异完全是由于不同的BH质量。我们的研究结果表明,活动星系核有两种类型,射电静和射电响,区别仅在于它们的凸起或BH的质量。

英文摘要:

We compare the Spectral Energy Distribution (SED) of radio-loud and radio-quiet AGNs in three different samples observed with SDSS: radio-loud AGNs (RLAGNs), Low Luminosity AGNs (LLAGNs) and AGNs in isolated galaxies (IG-AGNs). All these galaxies have similar optical spectral characteristics. The median SED of the RLAGNs is consistent with the characteristic SED of quasars, while that of the LLAGNs and IG-AGNs are consistent with the SED of LINERs, with a lower luminosity in the IG-AGNs than in the LLAGNs. We infer the masses of the black holes (BHs) from the bulge masses. These increase from the IG-AGNs to the LLAGNs and are highest for the RLAGNs. All these AGNs show accretion rates near or slightly below 10% of the Eddington limit, the differences in luminosity being solely due to different BH masses. Our results suggests there are two types of AGNs, radio quiet and radio loud, differing only by the mass of their bulges or BHs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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