AGN III - primordial activity in nuclei of late-type galaxies with pseudobulges

Abstract

1. Based on observational data on evolution of quasars and galaxies of different types along with the results of numerical simulations we make a conclusion that on low redshifts ($z<0.5$) QSOI/II objects in massive elliptical and spiral galaxies with classical bulges cannot be in late single activity event (be "primordial"). Instead of it they have had events of activity earlier in their evolution. It means that their presence on low redshifts is connected with the recurrence phenomenon, sequential wet minor mergings, because timescale of the activity does not exceed several units of $10^7$ years. 2. We define a new class - "AGN III" as active galactic nuclei in isolated late-type spirals with low-mass rapidly rotating pseudobulges. We also state that only such objects can be in the primordial phase of activity at low redshifts. Black holes in such galaxies have masses $M_{BH}<10^7{M}_{\odot }$ and also, probably very high spin. Such properties can explain their peculiar emission spectra. A good representative of AGN III might be the galaxies with narrow ($\mathrm{FWHM}(H\beta )\le 1200$ km/s) broad permitted emission lines - NLS. It is believed that their black hole masses are less than $M_{BH}<10^7{M}_{\odot }$ and their host galaxies have pseudobulges instead of the classical ones. Because host galaxies of NLS have pseudobulges and BLS (Broad-Line Seyfert galaxies) have classical bulges these two types of objects cannot have evolutionary connection. Presumably, the parent population of NLS are the quasars of "population A".

18 pages, to appear in Astronomy Reports

References in corpus (12)

• Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
• A Population of Radio-loud Narrow Line Seyfert 1 Galaxies with Blazar-like Properties?
• The redshift evolution of early-type galaxies in COSMOS: Do massive early-type galaxies form by dry mergers?
• Spitzer Uncovers Active Galactic Nuclei Missed by Optical Surveys in 7 Late-type Galaxies
• Discovery of a relationship between spiral arm morphology and supermassive black hole mass in disk galaxies
• The Sudden Death of the Nearest Quasar
• Evolution along the sequence of S0 Hubble types induced by dry minor mergers. I - Global bulge-to-disk structural relations
• Seyfert galaxies that are undergoing merging but appear non-interacting
• The X-ray luminous galaxies optically classified as star forming are mostly narrow line Seyfert 1s
• Radio Bimodality: Spin, Accretion Mode, or Both?
• Quasar Radio-Loudness and the Elliptical Core Problem
• The galactic spin of AGN galaxies

Cited by in corpus (1)

• Two active states of the narrow-line gamma-ray-loud AGN GB 1310+487