Sgr B2 ten year later: on the nature of the hard X-rays from the CMZ

Details Sgr B2 ten year later: on the nature of the hard X-rays from the CMZ Sgr B2 ten year later: on the nature of the hard X-rays from the CMZ

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2924t&link_type=abstract

Chandra proposal ID #11910849

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Scientific paper

The origin of the GC molecular clouds 6.4 keV emission has long been a matter of controversy: irradiation by cosmic ray electrons or by X-rays emitted by a flaring source. An interesting candidate in the latter case is a possible 300 yr old flare of Sgr A* of 6 order of magnitude above its current quiescent level. Using 6 years of monitoring of the GC we show a lightcurve of Sgr B2 revealing a significant decrease of the hard X-ray flux with a 20-year timescale, favoring the second scenario. We propose a deep Chandra exposure of Sgr B2 to search for the morphological changes in the cloud emission compared with a similar exposure taken in March 2000. This variations pattern is a key element to finally settle the controversy and understand the actual origin of the likely irradiating source.

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