Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.279z&link_type=abstract
Astronomy and Astrophysics Supplement, v.120, p.279-282
Astronomy and Astrophysics
Astrophysics
32
Stars: Individual: 4U 1608-522, X-Rays: Stars, Stars: Neutron
Scientific paper
A hard X-ray (low state) outburst lasting for about 170-days was observed with the Burst and Transient Source Experiment (BATSE) Large Area Detectors (LADs) from the X-ray burster 4U 1608-522 from June to December 1991. During the outburst, the flux slowly varied between 75mCrab and 150mCrab. Combined with a near simultaneous observation with the Ginga satellite, the low energy spectrum before the break energy is well determined to be a power law with photon index of about 1.75. The high energy spectrum above the break energy can be fit equally well by either the Sunyaev-Titarchuk (S-T) model or a broken power law model. For the first time, we have determined that a rather intense hard X-ray outburst from a neutron star system is associated with a soft X-ray (<10keV) low state and the power law photon spectrum breaks at about 65keV.
Barret Dider
Bloser Peter
Fishman Gerald J.
Ford Edward
Grindlay Jonathon E.
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