ASCA Observations of GRO J1655-40 and XTE J0421+560 (CI Cam)

Details ASCA Observations of GRO J1655-40 and XTE J0421+560 (CI Cam) ASCA Observations of GRO J1655-40 and XTE J0421+560 (CI Cam)

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.442u&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We observed the superluminal source GRO J1655-40 with ASCA on five occasions from 1994 through 1997. Significant absorption line features were detected in the iron-K band, which are attributable to the resonance absorption lines from helium-like and/or hydrogen iron ions. This gives direct evidence for the presence of highly ionized plasma in a non-spherical configuration in the vicinity of the black hole. The property of the continuum emission is also discussed. The newly discovered jet source XTE J0421+560 (CI Cam) was observed with ASCA on 1998 April 3-4, when it was in outburst. The spectrum can be explained by the emission from a multi-temperature thin-thermal plasma, although additional spectral structure is necessary to reproduce the broad iron-K emission line. Flare-like intensity enhancements were observed below 1 keV. We present the summary of the observational results and their implications.

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