Busca avançada
Ano de início
Entree

Bardeen Petterson effect and the disk structure of the seyfert galaxy ngc 1068

Processo: 07/02760-1
Linha de fomento:Auxílio à Pesquisa - Publicações científicas - Artigo
Vigência: 01 de junho de 2007 - 31 de outubro de 2007
Área do conhecimento:Ciências Exatas e da Terra - Astronomia - Astrofísica Extragaláctica
Pesquisador responsável:Anderson Caproni
Beneficiário:Anderson Caproni
Instituição-sede: Centro de Ciências Exatas e Tecnológicas. Universidade Cruzeiro do Sul (UNICSUL). São Paulo , SP, Brasil
Assunto(s):Buracos negros  Discos de acresção  Núcleos ativos de galáxias  Jatos (astronomia)  Publicações de divulgação científica  Artigo científico 

Resumo

VLBA high spatial resolution observations of the disk structure of the active galactic nucleus (AGN) NGC 1068 have recently revealed that the kinematics and geometry of this AGN is well characterized by an outer disk of H2O maser emission having a compact milliarcsecond-(parsec) scale structure, which is encircling a thin rotating inner disk surrounding a about 10to7 Mo compact mass, likely a black hole. A curious feature in this source is the occurrence of a misalignment between the inner and outer parts of the disk, with the galaxys radio jet being orthogonal to the inner disk. We interpret this peculiar configuration as due to the Bardeen-Petterson effect, a general relativistic effect that warps an initially inclined (to the black hole equator) viscous disk and drives the angular momentum vector of its inner part into alignment with the rotating black hole spin. We estimate the timescale for both angular momentato get aligned as a function of the spin parameter of the Kerr black hole. We also reproduce the shape of the parsec andkiloparsec-scale jets, assuming a model in which the jet is precessing with a period and aperture angle that decrease exponentially with time, as expected from the Bardeen-Petterson effect. (AU)