|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
19 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
X-ray observations of the hot phase in Sgr~A* | | A. Rozanska
; P. Mroz
; M. Moscibrodzka
; M. Sobolewska
; T. P. Adhikari
; | | Date: |
7 Jul 2015 | | Abstract: | We analyze 134 ks Chandra ACIS-I observations of the Galactic Centre (GC)
performed in July 2011. The X-ray image with the field of view $17’ imes 17’$
contains the hot plasma surrounding the Sgr~A*. The obtained surface brightness
map allow us to fit Bondi hot accretion flow to the innermost hot plasma around
the GC. We have fitted spectra from region up to $5"$ from Sgr~A* using a
thermal bremsstrahlung model and four Gaussian profiles responsible for
K$_{alpha}$ emission lines of Fe, S, Ar, and Ca. The X-ray surface brightness
profile up to $3"$ from Sgr~A* found in our data image, was successfully fitted
with the dynamical model of Bondi spherical accretion. By modelling the surface
brightness profile, we derived the temperature and number density profiles in
the vicinity of the black hole. The best fitted model of spherical Bondi
accretion shows that this type of flow works only up to $3"$ and implies outer
plasma density and temperature to be: $n_{
m e}^{
m out}=18.3 pm {0.1}$
cm$^{-3}$ and $T_{
m e}^{
m out}= 3.5 pm {0.3}$ keV respectively. We show
that the Bondi flow can reproduce observed surface brightness profile up to
$3"$ from Sgr~A* in the Galactic Center. This result strongly suggests the
position of stagnation radius in the complicated dynamics around GC. The
Faraday rotation computed from our model towards the pulsar PSR J1745-2900 near
the GC agrees with the observed one, recently reported. | | Source: | arXiv, 1507.1798 | | 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