BeppoSAX Observations of GS1826-238 in an Hard X-ray High State

Details BeppoSAX Observations of GS1826-238 in an Hard X-ray High State BeppoSAX Observations of GS1826-238 in an Hard X-ray High State

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cnoc.conf...10d&link_type=abstract

The Second National Conference on Astrophysics of Compact Objects, held in Bologna (Italy), September 19 - 21, 2001, p. 10

Astronomy and Astrophysics

Astrophysics

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Scientific paper

The BeppoSAX Narrow Field Instruments observed GS 1826-238 in October 1997 following an hard X-ray outburst with a peak flux of about 100 mCrab detected by BATSE. Two X-ray bursts are detected up to 70 kev during the first observation. The measured flux is up to 20 times in respect to the persistent emission. For both persistent and burst states, the spectrum in the 0.4 - 100 keV energy range is well fitted by an absorbed black body plus a flat power law (spectral index 1.7) with an exponential cutoff at 50 keV.The break at 50 keV, reminiscent of that observed by BATSE in X1608-52, indicates that, unlike in black hole candidates, the neutron star surface emission at soft energies tends to cool down the hot Comptonization region.

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