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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29373
Title: Polarization and long-term variability of Sgr A* X-ray echo
Authors: Churazov, E.
Khabibullin, I.
PONTI, GABRIELE 
Sunyaev, R.
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 468
Issue: 1
First Page: 165
Abstract: We use a model of the molecular gas distribution within ∼100 pc from the centre of the Milky Way (Kruijssen, Dale & Longmore) to simulate time evolution and polarization properties of the reflected X-ray emission, associated with the past outbursts from Sgr A*. While this model is too simple to describe the complexity of the true gas distribution, it illustrates the importance and power of long-term observations of the reflected emission. We show that the variable part of X-ray emission observed by Chandra and XMM-Newton from prominent molecular clouds is well described by a pure reflection model, providing strong support of the reflection scenario. While the identification of Sgr A* as a primary source for this reflected emission is already a very appealing hypothesis, a decisive test of this model can be provided by future X-ray polarimetric observations, which will allow placing constraints on the location of the primary source. In addition, X-ray polarimeters (like, e.g. XIPE) have sufficient sensitivity to constrain the line-of-sight positions of molecular complexes, removing major uncertainty in the model.
URI: http://hdl.handle.net/20.500.12386/29373
URL: https://academic.oup.com/mnras/article/468/1/165/3045401
ISSN: 0035-8711
DOI: 10.1093/mnras/stx443
Bibcode ADS: 2017MNRAS.468..165C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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