A Sudden State Change in 1E 1740.7-2942

Details A Sudden State Change in 1E 1740.7-2942 A Sudden State Change in 1E 1740.7-2942

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001atel...69....1s&link_type=abstract

The Astronomer's Telegram, #69

Astronomy and Astrophysics

Astronomy

2

X-Ray, Binaries, Black Holes

Scientific paper

The black hole candidate 1E 1740.7-2942 has made the most abrupt spectral transition since the beginning of an RXTE/PCA monitoring campaign in Feb. 1996. It transitioned from a soft power law of index -2.2 on May 12 to a hard power law of index -1.5 on May 14. It had reached the -2.2 index via two months of gradual softening. The total photon flux, corrected for interstellar absorption and extrapolated to 2-100 keV, remained virtually unchanged through the gradual softening and abrupt hardening.

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