Chandra Observations of Cygnus X-1 in a Rare, Sustained High/soft State

Details Chandra Observations of Cygnus X-1 in a Rare, Sustained High/soft State Chandra Observations of Cygnus X-1 in a Rare, Sustained High/soft State

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..721m&link_type=abstract

Chandra Proposal ID #02408033

Physics

Chandra Proposal Id #02408033

Scientific paper

The full SJ is contained in an email to the Director. A clear High/Soft State was observed in Cyg X-1 between 15 Oct. and 15 Nov. 2000 (mean flux: 0.5-1 Crab, 2-12 keV RXTE ASM). Following a short Low/Hard state, the mean rate returned to ~1 Crab on 7 Dec. 2000. This flux and observed spectral softness indicate that Cygnus X-1 has entered a second sustained High/Soft state episode. This outburst profile is similar to the 83-day High/Soft state observed May-Aug. 1996 (see http://xte.mit.edu/~rr/cygx1.ps). A Chandra observation of Cygnus X-1 (PI, Canizares; Cui et al. in prep.) in the Low/Hard state shows evidence for an Fe K-alpha line, Fe L edges (Cui et al, in prep). The dynamics and geometry of the L/Hard and H/Soft state are expected to be markedly different. Measurements of the iron e

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