A candidate optically quiescent quasar lacking narrow emission lines

0548007 - ASÚ 2022 RIV GB eng J - Článek v odborném periodiku
Greenwell, C. - Gandhi, P. - Stern, D. - Boorman, Peter G. - Toba, Y. - Lansbury, G. B. - Mainieri, V. - Desira, Ch.
A candidate optically quiescent quasar lacking narrow emission lines.
Monthly Notices of the Royal Astronomical Society. Roč. 503, č. 1 (2021), L80-L84. ISSN 0035-8711. E-ISSN 1365-2966
Grant CEP: GA ČR(CZ) GJ19-05599Y
Institucionální podpora: RVO:67985815
Klíčová slova: accretion * accretion discs * galaxies: active
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.235, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1093/mnrasl/slab019

We seek to formalize this subpopulation of AGN with a prototypical candidate, SDSS J075139.06+402810.9. This shows infrared (IR) colours typical for AGN, an optical spectrum dominated by an early type galaxy continuum, an [Om] lambda 5007 angstrom limiting flux about two dex below Type 2 quasars at similar IR power, and a k-corrected 12 mu m quasar-like luminosity of similar to 10(45) erg s(-1). These characteristics are not consistent with jet and host galaxy dilution. A potential scenario to explain this AGN quiescence in the optical is a sky-covering 'cocoon' of obscuring material, such that the AGN ionizing radiation is unable to escape and excite gas on kpc scales. Alternatively, we may be witnessing the short phase between recent triggering of obscured AGN activity and the subsequent narrow-line excitation. This prototype could define the base properties of an emerging candidate AGN subtype - an intriguing transitional phase in AGN and galaxy evolution.
Trvalý link: http://hdl.handle.net/11104/0324137