Dispersive Spectroscopy on AXAF

AXAF Data Analysis Challenges

The high quality of the AXAF X-ray data provides new challenges for the X-ray data analysis. It is clear that an “old” approach is not enough to fully exploit the capabilities of the AXAF instruments. We describe a few of the statistical and computational problems that we have so far identified. Some of them appear to be theoretically solvable but computationally challenging, while others state...

High Resolution X-ray Spectroscopy of Galaxies and Clusters with Axaf

We review the high resolution X–ray spectroscopy capabilities of the AXAF observatory focusing on the High Energy Transmission Grating (HETG). As part of the Guaranteed Time Observation (GTO) program, the HETG science team will observe both elliptical galaxies and clusters of galaxies. We discuss the problems associated with observing extended sources with the HETG and some of the potential sci...

Probing the Hot Igm with Axaf

The transmission grating spectrometers on AXAF have sufficient sensitivity and energy resolution to detect resonance X-ray absorption lines in the spectra of distant quasars. Such lines would be produced in an ionized, and somewhat chemically enriched component of the inter-galactic medium. The bulk of the baryonic content of the universe at redshifts ≤ 2− 3 could be in this form and would thus...

Stopped-flow X-ray Absorption Spectroscopy in Dispersive Mode

pH DEPENDANT XANES OF CARBONYLHEMOGLOBIN BY FAST DISPERSIVE SPECTROSCOPY

Fast x-Ray dispersive spectroscopy allowed by the dispersive geometric shows three transitions in the kinetics of 5mM carbonylhemoglobin denaturation. The CO detachment at low pH(2.6) is preceeded by CO bending due to the protonation (pH-5.6), and later by protein unfolding (pH-3.3) Only a few detection systems have been achieved to compete the creditable performance of synchrotron radiation so...