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http://dx.doi.org/10.5303/JKAS.2005.38.1.001

DETECTION OF X-RAY EMISSION FROM GALAXIES INSIDE AND TOWARDS THE NEARBY VOIDS  

KIM CHULHEE (Department of Earth Science Education, Chonbuk National University)
BOLLER TH. (Max-Planck-Institut fur Extraterrestrische Physik)
GHOSH KAJAL K. (Universities Space Research Association, NASA Marshall Space Flight Center)
Publication Information
Journal of The Korean Astronomical Society / v.38, no.1, 2005 , pp. 1-6 More about this Journal
Abstract
We searched for X-ray emission from the 665 galaxies inside and towards the nearby voids by analyzing the ROSAT All-Sky Survey (RASS) data as well as the ROSAT pointed observations (PSPC). As a result we have detected six X-ray emitting galaxies. Two (UGC 10205 and NGC 7509) are in the high density region in the local void, three (UGC 749, MCG +11-10-073, and Mrk 464) are towards the nearby voids, and UGC 32 is located in the low density region. We carried out a timing analysis for both Mrk 464 and UGC 32, and a spectral analysis for Mrk 464. The light curve of Mrk 464 shows the possibility of periodic X-ray flux variation and UGC 32 shows weak, but rapid variation.
Keywords
galaxies: active; galaxies: Seyfert; X-rays: galaxies; galaxies: structure;
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