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

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

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.2407q&link_type=abstract

American Astronomical Society Meeting 203, #24.07; Bulletin of the American Astronomical Society, Vol. 35, p.1248

Astronomy and Astrophysics

Astronomy

Scientific paper

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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