加州理工学院-NRAO条纹82调查（CNSS）。IV。射电类星体013815+00的诞生
Caltech-NRAO Stripe 82 Survey (CNSS). IV. The Birth of Radio-loud Quasar 013815+00
摘要：
一般认为气体吸积到超大质量黑洞（SMBH）上是其发光的主要过程，这种发光发生在光学、紫外和X射线区域，而在无线电波中较少发生。只有百分之几的类星体是射电强的，这一观测事实仍然是一个悬而未决的问题，涉及到对活动星系核（AGN）人口的理解。在这里，我们提出了一个快速过渡的无线电安静的无线电大声模式在类星体013815+00（z=0.94），这与它的紫外光连续谱和低电离Mg II宽线的变化相一致的检测。我们将其解释为一个质量约为10^9太阳质量的中心黑洞的吸积增强。结果，一个新的射电大活动星系核诞生了。它的光谱和形态特征表明，它在活动开始时经历了短的千兆赫兹峰值光谱阶段，现在已将其通量密度稳定在几毫焦耳年的水平。013815+00的射电形态非常紧凑，我们预测，在这种短期喷流活动的情况下，它的发展将非常缓慢。观测到的吸积盘的光度变化比013815+00中新射电相位的寿命短。
英文摘要：
It is believed that the gas accretion onto the supermassive black holes (SMBHs) is the main process of powering its luminous emission, which occurs in optical, UV and X-ray regimes and less frequently in radio waves. The observational fact that only a few percent of quasars are radio-loud is still an unresolved issue concerning the understanding of the active galactic nucleus (AGN) population. Here we present a detection of a rapid transition from the radio-quiet to the radio-loud mode in quasar 013815+00 (z=0.94) which coincides with changes of its UV-optical continuum and the low ionization MgII broadline. We interpret this as an enhancement of accretion onto a central black hole of mass about 10^9 solar masses. As a consequence a new radio-loud AGN was born. Its spectral and morphological properties indicate that it went through the short gigahertz-peaked spectrum (GPS) phase at the beginning of its activity and has now stabilized its flux density at the level of a few mJy. The radio morphology of 013815+00 is very compact and we predict that with such short-term jet activity its development will be very slow. The observed luminosity changes of the accretion disk are shorter than the lifetime of the new radio phase in 013815+00.
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