The Symbiotic Star SS73 17: What Generates the Hard X-rays?

Details The Symbiotic Star SS73 17: What Generates the Hard X-rays? The Symbiotic Star SS73 17: What Generates the Hard X-rays?

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2353s&link_type=abstract

Chandra Proposal ID #09300413

Physics

Chandra Proposal Id #09300413

Scientific paper

SS73 17 was an innocuous Mira-type symbiotic star until INTEGRAL and Swift discovered its bright hard X-ray emission. Suzaku observations then showed it emits three bright iron lines as well, with almost no emission in the 0.5-2 keV bandpass. The origin of the lines is unclear - scattered, thermal or photoionized sources, at high- or low-density are all plausible - but with a 100 ksec HETG observation we can resolve this question. Beyond its intrinsic interest as one of the few symbiotics showing hard X-rays (uniquely, it shows no optical flaring), SS73 17 may be the "missing link" that explains the line emission from the Galactic Ridge X-ray Emission (GRXE), as its iron lines have roughly the same radio as the GRXE while its soft X-ray flux is at or below ROSAT's detection threshold.

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