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- W1570869982 abstract "Archival EXOSAT and HEAO1‐A2 data from Cyg X‐1 show the ‘‘high energy excess’’ above 10 keV seen in X‐ray observations of AGN. Using a likelihood ratio test, we are for the first time able to distinguish conclusively in favor of Compton reflection rather than partial covering as the origin of the high energy excess. This supports the idea of an X‐ray illuminated accretion disk in Cyg X‐1, but the line equivalent width is smaller by a factor of 2–3 than that expected from such a disk. While the large optical depth required for reflection as opposed to line emission admit the possibility of seeing the line without reflection, the converse is NOT possible. To see a reflection spectrum, including the strong iron absorption edge, implies that strong iron emission MUST be observed as the line and edge are causally linked. While the line predicted from a spherical, optically thick source at the center of a flared disk of twice cosmic abundance gives a line within 3 σ of that observed and is also consistent with the normalization of the reflection spectrum, a similar effect seen in GINGA data on high mass X‐ray binaries suggests that the weak line emission may be an indication of a more widespread problem in models of X‐ray illuminated accretion disks in these systems." @default.
- W1570869982 created "2016-06-24" @default.
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- W1570869982 date "1992-01-01" @default.
- W1570869982 modified "2023-09-25" @default.
- W1570869982 title "Problems for the standard blackhole/accretion disk models in Cygnus X-1?" @default.
- W1570869982 doi "https://doi.org/10.1063/1.42280" @default.
- W1570869982 hasPublicationYear "1992" @default.
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