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http://hdl.handle.net/20.500.12386/29373
Titolo: | Polarization and long-term variability of Sgr A* X-ray echo | Autori: | Churazov, E. Khabibullin, I. PONTI, GABRIELE Sunyaev, R. |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 468 | Fascicolo: | 1 | Da pagina:: | 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 |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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