Lognormality of the FUV Continuum Background

Details Lognormality of the FUV Continuum Background Lognormality of the FUV Continuum Background

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360502s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #605.02

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of the far-ultraviolet (FUV; 1370-1720A) continuum background using the data obtained with the SPEAR/FIMS instrument. The FUV intensity distribution was found to be lognormal, and its angular power spectrum is a scale-free power-law. These characteristics can be attributable to the turbulent motion of the interstellar medium. The intensity distribution of FUV sin |b| is well characterized by a lognormal distribution with 2.71 and a standard deviation sigma 0.29. The lognormal distribution is the likely origin of large fluctuations noted, but largely ignored, in previous observations of the FUV continuum background. A least-square fit to the angular power spectrum for b > 10 deg with a power law of gamma -2.4 over the range 5 < l < 200.

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