Jetted Narrow-Line Seyfert 1 Galaxies & Co.: Where Do We Stand?

被引：26

作者：

Foschini, Luigi ^{[1
]}

机构：

[1] INAF Brera Astron Observ, I-23807 Merate, Italy

来源：

UNIVERSE | 2020年 / 6卷 / 09期

关键词：

relativistic jets; active galactic nuclei; Seyfert; blazar; high-energy gamma rays; BLACK-HOLE MASS; ACTIVE GALACTIC NUCLEI; GAMMA-RAY EMISSION; INTRANIGHT OPTICAL VARIABILITY; RADIO-LOUD; X-RAY; BROAD-LINE; RELATIVISTIC JET; SPECTRAL VARIABILITY; PMN J0948+0022;

D O I：

10.3390/universe6090136

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The discovery in 2008 of high-energy gamma-rays from Narrow-Line Seyfert 1 Galaxies (NLS1s) made it clear that there were active galactic nuclei (AGN) other than blazars and radio galaxies that can eject powerful relativistic jets. In addition to NLS1s, the great performance of theFermiLarge Area Telescope made it possible to discover MeV-GeV photons emitted from more classes of AGN, like Seyferts, Compact Steep Spectrum Gigahertz Peaked Sources (CSS/GPS), and disk-hosted radio galaxies. Although observations indicate a variety of objects, their physical characteristics point to a central engine powered by a relatively small-mass black hole (but, obviously, there are interpretations against this view). This essay critically reviews the literature published on these topics during the last eight years and analyzes the perspectives for the forthcoming years.

引用

页数：27

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