|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
27 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
A microlensing study of the accretion disc in the quasar MG 0414+0534 | | N. F. Bate
; D. J. E. Floyd
; R. L. Webster
; J. S. B. Wyithe
; | | Date: |
7 Oct 2008 | | Abstract: | Observations of gravitational microlensing in multiply imaged quasars
currently provide the only direct probe of quasar emission region structure on
sub-microarcsecond scales. Analyses of microlensing variability are
observationally expensive, requiring long-term monitoring of lensed systems.
Here we demonstrate a technique for constraining the size of the quasar
continuum emission region as a function of wavelength using single-epoch
multi-band imaging. We have obtained images of the lensed quasar MG 0414+0534
in five wavelength bands using the Magellan 6.5-metre Baade telescope at Las
Campanas Observatory, Chile. These data, in combination with two existing
epochs of Hubble Space Telescope data, are used to model the size of the
continuum emission region $sigma$ as a power-law in wavelength,
$sigmaproptolambda^
u$. We place an upper limit on the Gaussian width of
the $r^prime$-band emission region of $1.80 imes 10^{16} h_{70}^{-1/2}
(<M>/
mn{M}_{odot})^{1/2}$cm, and constrain the power-law index to
$0.77leq
uleq2.67$ (95 per cent confidence range). These results can be used
to constrain models of quasar accretion discs. As a example, we find that the
accretion disc in MG 0414+0534 is statistically consistent with a
Shakura-Sunyaev thin disc model. | | Source: | arXiv, 0810.1092 | | 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