AAS 203rd Meeting, January 2004
Session 24 Observatories and Observing Conditions: Optical to X-rays
Oral, Monday, January 5, 2004, 10:00-11:30am, Centennial III

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[24.07] Using the Crab Nebula to Correct for an Energy Dependent Instrumental Effect in Unconventional Stellar Aspect (USA) Data

K. O. Quinones (University of California, Berkeley), Stanford Linear Accelerator, Group K Particle Astrophysics Collaboration, Naval Research Laboratory Collaboration

The Unconventional Stellar Aspect (USA) detector was launched in February 1999 for the purposes of studying X-ray binary systems, including Black Hole Candidates (BHCs) and neutron stars (NSs). USA was capable of examining high frequency phenomena, but within its ~18 month run, an instrumental feature manifesting itself in the frequency range >100Hz was found in the power spectra of several sources. This malfunction, termed the Energy Dependent Instrumental Effect (EDIE), can be best seen when looking at USA’s data of the Crab Nebula since the Crab provides for a very constant source known not to exhibit power in the frequency ranges where EDIE is seen. Using the Crab, this work involves correcting for EDIE by fitting its power spectrum for various energy channels and a range of rates. A relation between the parameters of these fits, the energy channels, and count rates is investigated so that this effect can be properly understood.

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.