从地板下看：低功率下AGN无线电发光度功能的限制
Looking below the floor: constraints on the AGN radio luminosity functions at low power
摘要：
本文对两类活动星系核的射电光度函数（RLF）的行为进行了约束，即低射电功率活动星系核（LRP）和BL Lac天体。将观测到的陡峭RLF外推到低功率，预测这类物体的空间密度超过了可以容纳它们的源的空间密度，这需要一个较浅的斜坡。对于LRP活动星系核，我们得到在1.4 GHz处的P_br，LRP> 10^20.5 W/Hz，以限制它们的密度小于黑洞质量M_BH> 10^7.5太阳质量的椭圆星系的密度。通过将该值与由观测得出的极限值相结合，断裂必定发生在P_br，LRP~10^20.5 - 10^21.5 W/Hz处。对于BL Lac，我们发现P_br，BLLAC> 10^23.3 W/Hz，否则它们将超过弱线致密射电源的密度，而观测结果表明P_br，BLLAC <10^24.5 W/Hz。在活动星系核统一模型的框架下，LRP活动星系核RLF的低光度突变必然对应于BL Lac的RLF突变。P_br，LRP和P_br，BLLAC之间的比值约为10^3，正如对喷流多普勒因子约为10所预期的那样。
英文摘要：
We constrain the behavior of the radio luminosity function (RLF) of two classes of active galactic nuclei (AGN) namely AGN of low radio power (LRP) and BL Lac objects. The extrapolation of the observed steep RLFs to low power predicts a space density of such objects that exceeds that of the sources that can harbor them and this requires a break to a shallower slope. For LRP AGN we obtain P_br,LRP > 10^20.5 W/Hz at 1.4 GHz to limit their density to be smaller than that of elliptical galaxies with black hole masses M_BH > 10^7.5 solar masses. By combining this value with the limit derived by the observations the break must occur at P_br,LRP~10^20.5-10^21.5 W/Hz. For BL Lacs we find P_br,BLLAC > 10^23.3 W/Hz otherwise they would outnumber the density of weak-lined and compact radio sources, while the observations indicate P_br,BLLAC < 10^24.5 W/Hz. In the framework of the AGN unified model a low luminosity break in the RLF of LRP AGN must correspond to a break in the RLF of BL Lacs. The ratio between P_br,LRP and P_br,BLLAC is ~10^3, as expected for a jet Doppler factor of ~10.
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