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Discovery of a New X-ray Transient in Scorpius GRO J1655-40 ≡ X-ray Nova Scorpii 1994

Published online by Cambridge University Press:  25 May 2016

W.S. Paciesas ,
S.N. Zhang ,
B.C. Rubin ,
B.A. Harmon ,
C.A. Wilson  and
G.J. Fishman
W.S. Paciesas
Affiliation:
University of Alabama in Huntsville, Huntsville, AL 35899 USA
S.N. Zhang
Affiliation:
Universities Space Research Association, Huntsville, AL 35806 USA
B.C. Rubin
Affiliation:
Universities Space Research Association, Huntsville, AL 35806 USA
B.A. Harmon
Affiliation:
NASA/Marshall Space Flight Center, Huntsville, AL 35812 USA
C.A. Wilson
Affiliation:
NASA/Marshall Space Flight Center, Huntsville, AL 35812 USA
G.J. Fishman
Affiliation:
NASA/Marshall Space Flight Center, Huntsville, AL 35812 USA

Abstract

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A bright transient X-ray source, GRO J1655-40 (X-ray Nova Scorpii 1994) was discovered with BATSE (the Burst and Transient Source Experiment) in late July 1994. More recently, the source also became a strong radio emitter, its rise in the radio being approximately anti-correlated with a decline in the hard X-ray intensity. High-resolution radio observations subsequent to this symposium showed evidence for superluminally expanding jets. Since the hard X-ray emission extends to at least 200 keV and we find no evidence of pulsations, we tentatively classify the source as a black-hole candidate. However, its hard X-ray spectrum is unusually steep (power-law photon index α ≃ −3) relative to most other black-hole candidates. In this regard, it resembles GRS 1915+105, the first galactic source to show superluminal radio jets.

Type
5 X-ray Binaries
Information
Symposium - International Astronomical Union , Volume 165: Compact Stars in Binaries , 1996 , pp. 363 - 367
Copyright
Copyright © Kluwer 1996 

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