Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cxo..prop.1354m&link_type=abstract
Chandra Proposal ID #04408136
Astronomy and Astrophysics
Astronomy
Chandra Proposal Id #04408136
Scientific paper
[The full SJ is contained in an email to the director.] A sensitive spectrum of a transient Galactic black hole in the low/hard state can address at least 3 of the most fundamental issues in X-ray astronomy: 1) major pictures for changes in accretion flow geometry with the mass accretion rate (m-dot), 2) relativistic effects near black holes, and 3) jet formation. GX 339-4 is an ideal target for this purpose. At present, grating spectra and even CCD spectra obtained from sources in this state have collected < 10^4 counts each (in the best cases), insufficient for strong constraints. Our proposed grating observation will obtain appx 10^6 counts in the dispersed spectrum. We will use continuum spectroscopy and the shape of the Fe K-alpha line to constrain the radial location of the inner disk, and thereby the nature of the flow geometry and the role of the disk in jet formation in the low/hard state.
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