Past and present secular evolution in the host galaxies of NLS1s

[en] In this contribution we show that the host galaxies of NLS1s differ dramatically from those of Broad-Line Seyfert 1s (BLS1s). This leads us to propose that NLS1s represent a class of AGN in which the black hole growth is, and has always been, dominated by secular evolution. Our line of argument is as follows. Firstly, by looking at the properties of NLS1 hosts in the literature, we show that the evolution of NLS1s is currently mainly driven by secular processes, in contrast to BLS1s. Secondly, we study the bulges of NLS1 and BLS1 galaxies, and we find that statistically NLS1s have lower Sérsic indices (< nb >∼ 1.5) and less prominent bulges (bulge-to-total light ratio, < B/T >∼ 0.2) than BLS1s (< nb >∼ 2.5 and < B/T >∼ 0.4). This result indicates that NLS1 host bulges are pseudo-bulges and distinct from BLS1 bulges. The direct consequence of this result is that internal secular evolution must have dominated the past evolution of NLS1 hosts, possibly explaining their particular AGN properties.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Orban De Xivry, Gilles ; Max Planck Institut fur extraterrestrische Physik

Davies, R.

Schartmann, M.

Komossa, S.

Marconi, A.

Hicks, E.

Engel, H.

Tacconi, L.

Language :

English

Title :

Past and present secular evolution in the host galaxies of NLS1s

Publication date :

2011

Event name :

Narrow-Line Seyfert 1 Galaxies and their place in the Universe

Event place :

Milano, Italy

Event date :

April 4-6, 2011

Audience :

International

Main work title :

Narrow-Line Seyfert 1 Galaxies and their Place in the Universe

Collection name :

Proceedings of Science (PoS, Trieste, Italy), vol. NLS1

Additional URL :

http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=126

Available on ORBi :

since 12 September 2017

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