Effects of background counts in RMS normalization

Details Effects of background counts in RMS normalization Effects of background counts in RMS normalization

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587..691b&link_type=abstract

GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 691-695 (2001).

Astronomy and Astrophysics

Astrophysics

X-Ray Sources, X-Ray Bursts, X-Ray

Scientific paper

Root-Mean-Square (RMS) normalization is a popular method of measuring the fast time variability in astronomical x-ray sources. The traditional definition contains the implicit assumption that the background contribution to the count rate is negligible. In this letter I illustrate that in cases where background counts are important, this can lead to erroneous results. However, I also illustrate a simple modification that can remove the effect of the background and makes RMS variability a more reliable measure of variability between observations from different instruments. .

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