Radiation pressure, absorption and AGN feedback in the Chandra Deep Fields
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
The presence of absorbing gas around the central engine of active
galactic nuclei (AGN) is a common feature of these objects. Recent work
has looked at the effect of the dust component of the gas, and how it
enhances radiation pressure such that dusty gas can have a lower
effective Eddington limit than ionized gas. In this work, we use
multiwavelength data and X-ray spectra from the 2 Ms exposures of the
Chandra Deep Field-North and Chandra Deep Field-South surveys to
characterize the AGN in terms of their Eddington ratio (λ) and
hydrogen column density (NH). Their distributions are then
compared with what is predicted when considering the coupling between
dust and gas. Our final sample consists of 234 objects from both fields,
the largest and deepest sample of AGN for which this comparison has been
made up to date. We find that most of the AGN in our sample tend to be
found at low Eddington ratios (typically 10-4 <λ
<10-1) and high NH
(>1022cm-2), with black hole masses in the
range ~(108-109)Msolar. Their
distribution is in agreement with that expected from the enhanced
radiation pressure model, avoiding the area where we would predict the
presence of outflows. We also investigate how the balance between AGN
radiation pressure and gravitational potential influences the behaviour
of clouds in the Galactic bulge, and describe a scenario where an
enhanced radiation pressure can lead to the Fundamental Plane of black
hole/galaxy scaling relations.
Originalsprog | Engelsk |
---|---|
Tidsskrift | Monthly Notices of the Royal Astronomical Society |
Vol/bind | 408 |
Udgave nummer | 3 |
Sider (fra-til) | 1714-1720 |
ISSN | 0035-8711 |
DOI | |
Status | Udgivet - 1 nov. 2010 |
Eksternt udgivet | Ja |
ID: 230475790