Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335705b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #357.05; Bulletin of the American Astronomical Society, Vol. 41, p.500
Mathematics
Logic
Scientific paper
We simulate anisotropic outflows from AGN and investigate their large-scale cosmological impact, by performing N-body simulations of ΛCDM Universe. A substantial fraction of AGN have been observed to host outflows powered by their central supermassive black holes. On large (Mpc) scales these energetic outflows are expected to move away from the high-density regions of large-scale structures (filaments and pancakes), with the outflowing matter getting channelled into low-density regions of the Universe. This causes an outflow to attain an anisotropic shape. The outflows expand and permeate significant volumes of the Universe, having feedback on further evolution of the filled volumes. Possible impacts include metal enrichment of the IGM leading to modifications of the cooling rate of star-forming gas, expulsion of proto-galactic gas by ram pressure stripping causing suppression of further star / galaxy formation.
We implement semi-analytical prescriptions of such anisotropic AGN outflows within a cosmological volume. The observed quasar luminosity function is used to get the redshift and luminosity distribution of AGN populations, and analytical models are used for the outflow expansion. We compute the fractional volume of the simulation box filled by the anisotropic outflows of a cosmological population of AGN over the Hubble time, and the energy density, magnetic field and metallicity in the filled volumes. We explore the dependence of varying opening angle of the outflows and other model parameters on these large scale influence. Results from our N-body cosmological simulations will be presented.
Barai Paramita
Germain Joel
Martel Hugo
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