An Orientation-Based Unification of Young Jetted AGN: The Case of 3C 286

Frontiers in Astronomy and Space Sciences

Rafanelli, Piero¹  Frezzato, Michele¹  Foschini, Luigi¹  Caccianiga, Alessandro²  Congiu, Enrico²  Ciroi, Stefano²  Berton, Marco³  La Mura, Giovanni³  Cracco, Valentina³ 

[1] di Padova, Padova, Italy;Brera Astronomical Observatory (INAF), Merate, Italy;Dipartimento di Fisica e Astronomia “G. Galilei,” Università

关键词: Active Galactic Nuclei (AGN);    Narrow-line Seyfert 1 galaxies;    Compact steep-spectrum sources;    Relativistic jets;    unification models;   

DOI  :  10.3389/fspas.2017.00008

学科分类：空间科学

来源: Frontiers

【 摘 要 】

In recent years, the old paradigm according to which only high-mass black holes can launch powerful relativistic jets in active galactic nuclei (AGN) has begun to crumble. The discovery of $\gamma$-rays coming from narrow-line Seyfert 1 galaxies (NLS1s), usually considered young and growing AGN harboring a central black hole with mass typically lower than 10$^8$ M$_\odot$, indicated that also these low-mass AGN can produce powerful relativistic jets. The search for parent population of $\gamma$-ray emitting NLS1s revealed their connection with compact steep-spectrum sources (CSS). In this proceeding we present a review of the current knowledge of these sources, we present the new important case of 3C 286, classified here for the fist time as NLS1, and we finally provide a tentative orientation based unification of NLS1s and CSS sources.

【 授权许可】

CC BY