Article (Scientific journals)
The X-ray footprint of the CircumNuclear Disk
Mossoux, Enmanuelle; Eckart, Andreas
2018In Monthly Notices of the Royal Astronomical Society, 474 (3), p. 3787-3807
Peer Reviewed verified by ORBi
 

Files


Full Text
mossoux17c.pdf
Publisher postprint (10.81 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Galaxy: centre; X-rays: individual: Sgr A
Abstract :
[en] We studied the central regions of the Galactic Centre to determine if the CircumNuclear Disk (CND) acts as an absorber or a barrier for the central X-rays diffuse emission. After reprocessing 4.6Ms of Chandra observations, we were able to detect, for the first time, a depression in the X-ray luminosity of the diffuse emission whose size and location correspond to those of the CND. We extracted the X-ray spectra for various regions inside the CND footprint as well as for the region where the footprint is observed and for a region located outside the footprint. We simultaneously fitted these spectra as an optically thin plasma whose absorption by the interstellar medium and by the local plasma were fitted independently using the MCMC method. The hydrogen column density of the ISM is 7.5x10^22 cm^-2. The X-ray diffuse emission inside the CND footprint is formed by a 2T plasma of 1 and 4keV with slightly super-solar abundances except for the iron and carbon which are sub-solar. The plasma from the CND, in turn, is better described by a 1T model with abundances and local hydrogen column density which are very different to those of the innermost regions. The large iron abundance in this region confirms that the CND is dominated by the shock-heated ejecta of the Sgr A East supernova remnant. We deduced that the CND rather acts as a barrier for the Galactic Centre plasma and that the plasma located outside the CND may correspond to the collimated outflow possibly created by Sgr A* or the interaction between the wind of massive stars and the mini-spiral material.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Mossoux, Enmanuelle ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Eckart, Andreas
Language :
English
Title :
The X-ray footprint of the CircumNuclear Disk
Publication date :
March 2018
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
474
Issue :
3
Pages :
3787-3807
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 312789 - STRONGGRAVITY - Probing Strong Gravity by Black Holes Across the Range of Masses
Funders :
CE - Commission Européenne [BE]
Available on ORBi :
since 23 December 2017

Statistics


Number of views
55 (8 by ULiège)
Number of downloads
65 (3 by ULiège)

Scopus citations®
 
9
Scopus citations®
without self-citations
4
OpenCitations
 
5

Bibliography


Similar publications



Contact ORBi