|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The dust sublimation radius as an outer envelope to the bulk of the narrow Fe Kalpha line emission in Type 1 AGN | | Poshak Gandhi
; Sebastian F. Hoenig
; Makoto Kishimoto
; | | Date: |
9 Feb 2015 | | Abstract: | The Fe Kalpha emission line is the most ubiquitous feature in the X-ray
spectra of active galactic nuclei (AGN), but the origin of its narrow core
remains uncertain. Here, we investigate the connection between the sizes of the
Fe Kalpha core emission regions and the measured sizes of the dusty tori in 13
local Type 1 AGN. The observed Fe Kalpha emission radii (R_fe) are determined
from spectrally resolved line widths in X-ray grating spectra, and the dust
sublimation radii (R_dust) are measured either from optical/near-infrared
reverberation time lags or from resolved near-infrared interferometric data.
This direct comparison shows that the dust sublimation radius forms an outer
envelope to the bulk of the Fe Kalpha emission. R_fe matches R_dust well in the
AGN with the best constrained line widths currently. In a significant fraction
of objects without a clear narrow line core, R_fe is similar to, or smaller
than the radius of the optical broad line region. These facts place important
constraints on the torus geometries for our sample. Extended tori in which the
solid angle of fluorescing gas peaks at well beyond the dust sublimation radius
can be ruled out. We also test for luminosity scalings of R_fe, finding that
Eddington ratio is not a prime driver in determining the line location in our
sample. Large uncertainties on the line core widths preclude more detailed
investigations at present, a limitation which Astro-H will help to overcome. | | Source: | arXiv, 1502.2661 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER