Radiation pressure, absorption and AGN feedback in the Chandra Deep Fields - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: The presence of absorbing gas around the central engine of Active GalacticNuclei AGN is a common feature of these objects. Recent work has looked atthe effect of the dust component of the gas, and how it enhances radiationpressure such that dusty gas can have a lower effective Eddington limit thanionised gas. In this work, we use multi-wavelength data and X-ray spectra fromthe 2 Ms exposures of the Chandra Deep Field North and Chandra Deep Field Southsurveys, to characterise the AGN in terms of their Eddington ratio and hydrogencolumn density. Their distributions are then compared with what is predictedwhen considering the coupling between dust and gas. Our final sample consistsof 234 objects from both fields, the largest and deepest sample of AGN forwhich this comparison has been made up to date. We find that most of the AGN inour sample tend to be found at low Eddington ratios typically between 1e-4 and1e-1 and high column density >1e22 cm^-2, with black hole masses between~1e8 and 1e9 solar masses. Their distribution is in agreement with thatexpected from the enhanced radiation pressure model, avoiding the area where wewould predict the presence of outflows. We also investigate how the balancebetween AGN radiation pressure and gravitational potential influences thebehaviour of clouds in the galactic bulge, and describe a scenario where anenhanced radiation pressure can lead to the fundamental plane of blackhole-galaxy scaling relations.



Autor: S. I. Raimundo, A. C. Fabian, F. E. Bauer, D. M. Alexander, W. N. Brandt, B. Luo, R. V. Vasudevan, Y. Q. Xue

Fuente: https://arxiv.org/







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