INVESTIGADORES
CORA Sofia Alejandra
congresos y reuniones científicas
Título:
Spin paradigm: is the black hole spin related with galaxy morphology
Autor/es:
LAGOS, C. DEL P.; PADILLA, N. D.; CORA, S. A.
Lugar:
La Plata
Reunión:
Otro; First La Plata International School on Astronomy and Geophysics: Compact Objects and their Emission; 2008
Resumen:
We present a
study of the revised version of the "spin paradigm" by Sikora &
Lasota (2007) which follows the conjecture that the observedAGN-radioloudness bimodality can be explained by a morphology-relatedbimodality
of the distribution of black-hole (BH) spins in the centres of
galaxies: central BHs in giant elliptical galaxies may have (on average)
much larger spins than BHs in disk galaxies. We usea combination of
a cosmological N-body simulation of the concordance Lambda cold dark
matter (Lambda CDM) paradigm and a semi-analytic model of galaxy
formation (Lagos, Cora & Padilla 2008). This new semi-analitic model
(SAG hereafter) takes into account Active Galactic Nuclei (AGN)
associated with the presence of super massive BHs (SMBH), assumedto
grow via (i) gas accretion during merger-driven starbursts and mergers
with other BHs, (ii) accretion during starbursts triggered by disk
instabilities, and (iii) accretion of cold gas from
quasi-hydrostatically cooling haloes. The computation of BH spins is
done taking into account recent works on the subject (Shakura & Sunyaev 1973; King et al. 2005; Lodato & Pringle 2006; Volonteri, Sikora & Lasota2007).
In this model, BH spins are determined exclusively by the accretion
history; magneto-hydrodynamics and general relativity effects are not
taken into account. Here we show how the accretion from a warped disc
influences the evolution of BH spins with a detailed study on the
contribution from each accretion mechanism. We find that our model
follows the "spin paradigm".