|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
A Chandra Study of Sgr A East: A Supernova Remnant Regulating The Activity Of Our Galactic Center? | | Y. Maeda
; F. K. Baganoff
; E. D. Feigelson
; M. Morris
; M. W. Bautz
; W. N. Brandt
; D. N. Burrows
; J. P. Doty
; G. P. Garmire
; S. H. Pravdo
; G. R. Ricker
; L. K. Townsley
; | | Date: |
10 Feb 2001 | | Subject: | astro-ph | | Abstract: | We report on the X-ray emission from the shell-like, non-thermal radio source Sgr A East located in the inner few parsecs of the Galaxy based on observations made with the ACIS detector on board Chandra. This is the first time Sgr A East has been clearly resolved from other complex structures in the region. The X-ray emitting region is concentrated within the central $simeq 2$ pc of the larger radio shell. The spectrum shows strong K$alpha$ lines from highly ionized ions of S, Ar, Ca, and Fe. A simple isothermal plasma model gives electron temperature $sim 2$ keV, absorption column $sim 1 imes 10^{23}$ H/cm^2, luminosity $sim 8 imes 10^{34}$ ergs/s in the 2--10 keV band, and gas mass $sim 2eta^{1/2}$ M$_{odot}$ with a filling factor $eta$. The plasma appears to be rich in heavy elements, over-abundant by roughly a factor of four with respect to solar abundances, and shows a spatial gradient of elemental abundance: the spatial distribution of iron is more compact than that of the lighter elements. The gas mass and elemental abundance of the X-ray emission support the long-standing hypothesis that Sgr A East is a supernova remnant (SNR), maybe produced by the Type II supernova explosion of a massive star with a main-sequence mass of 13--20 M$_odot$. The combination of the radio and X-ray morphologies classifies Sgr A East as a new metal-rich ``mixed morphology’’ (MM) SNR. The size of the Sgr A East radio shell is the smallest of the known MM SNRs, which strongly suggests that the ejecta have expanded into a very dense interstellar medium. The ejecta-dominated chemical compositions of the plasma indicate that the ambient materials should be highly homogeneous. The relation between Sgr A East and the massive blackhole Sgr A* is discussed. | | Source: | arXiv, astro-ph/0102183 | | 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