What powers the most relativistic jets? - II. Flat-spectrum radio quasars

被引：17

作者：

Gardner, Emma ^{[1
]}

Done, Chris ^{[1
]}

机构：

[1] Univ Durham, Dept Phys, Ctr Extragalact Astron, South Rd, Durham DH1 3LE, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 473卷 / 02期

基金：

英国科学技术设施理事会;

关键词：

accretion; accretion discs; black hole physics; galaxies: jets; quasars: supermassive black holes; cosmology: miscellaneous; gamma-rays: galaxies; ACTIVE GALACTIC NUCLEI; LINE SEYFERT 1; BLACK-HOLE MASS; SELF-COMPTON MODELS; FERMI BLAZARS; PMN J0948+0022; AREA TELESCOPE; ACCRETION; EVOLUTION; LOUD;

D O I：

10.1093/mnras/stx2516

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Flat-spectrum radio quasars (FSRQs) are the most powerful relativistic jets seen from super-massive black holes (BHs) accreting via a radiatively efficient thin disc. Their high energy emission is well modelled by highly relativistic electrons in the jet Compton upscattering an external source of seed photons, primarily from the broad-line region. Strong Doppler boosting by the jet bulk motion makes these FSRQs readily detectable by the Fermi Large Area Telescope. We combine jet spectral models with scaling relations for the jet physical parameters as a function of mass and accretion rate. This does not match well to the gamma-ray loud narrow-line Seyfert 1s, assuming their low BH masses are reliable, but is able to predict much of the spectral evolution observed along the Blazar sequence. We use these models in conjunction with cosmological simulations of efficiently accreting BH number densities, and find that they overpredict the observed number of FSRQs by two orders of magnitude if all of these objects produce an FSRQ jet. We can better reproduce the observed numbers if jets are only produced by high-spin BHs and BH spin is built from chaotically aligned accretion episodes so that high-spin BHs are rare. However, this does not reproduce the observed redshift and mass accretion rate distributions of the FSRQs. This may indicate a redshift dependence in accretion mode, with sustained alignment accretion episodes being more prevalent at higher redshift, or that there is some other trigger for FSRQ jets.

引用

页码：2639 / 2654

页数：16

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