Article (Scientific journals)
The role of secular evolution in the black hole growth of narrow-line Seyfert 1 galaxies
Orban De Xivry, Gilles; Davies, R.; Schartmann, M. et al.
2011In Monthly Notices of the Royal Astronomical Society, 417, p. 2721-2736
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Keywords :
galaxies: active; galaxies: bulges; galaxies: evolution; galaxies: Seyfert
Abstract :
[en] Narrow-line Seyfert 1 (NLS1) galaxies show extreme properties with respect to the other Seyfert galaxies. Indeed, they are thought to be accreting at Eddington rates and to possess low-mass black holes. Therefore, they may represent a key class of objects for understanding the co-evolution of black holes and their host galaxies. We propose that NLS1s represent a class of active galactic nucleus in which the black hole growth is, and has always been, dominated by secular evolution. First, by looking at the NLS1 host galaxy properties in the literature, we show that the evolution of NLS1s is presently driven by secular processes, much more so than for broad-line Seyfert 1s (BLS1s). Secondly, we study the bulges of NLS1 and BLS1 galaxies. Our results demonstrate that NLS1 host bulges are pseudo-bulges and are statistically different from BLS1 bulges. This difference points to the particular importance of secular processes in the past evolution of their hosts. We build on this result to understand the implications on their evolution and the duration of their duty cycle. We show that NLS1s are not necessarily in a special phase of black hole growth and that several Gyr are required for their black hole masses to become similar to BLS1s. Finally, in the light of our results, we discuss the location of NLS1 galaxies on the MBH-σ plane and speculate about the connection between the NLS1 galaxy properties and their black hole spin.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Orban De Xivry, Gilles  ;  Max Planck Institut für extraterrestrische Physik
Davies, R.;  Max Planck Institut für extraterrestrische Physik
Schartmann, M.;  Max Planck Institut für extraterrestrische Physik
Komossa, S.;  Max Planck Institut für extraterrestrische Physik
Marconi, A.;  Università degli Studi di Firenze - UniFI > Dipartimento di Fisica e Astronomia
Hicks, E.;  University of Washington - UW > Department of Astronomy
Engel, H.;  Max Planck Institut für extraterrestrische Physik
Tacconi, L.;  Max Planck Institut für extraterrestrische Physik
Language :
English
Title :
The role of secular evolution in the black hole growth of narrow-line Seyfert 1 galaxies
Publication date :
2011
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
417
Pages :
2721-2736
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 22 August 2017

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