Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-17
Astronomy and Astrophysics
Astrophysics
12 pages, 9 figures, Submitted to A&A
Scientific paper
10.1051/0004-6361:20078691
We study the cosmic X-ray background (CXB) intensity variations on large angular scales using slew data of the RXTE observatory. We detect intensity variations up to ~2% on angular scales of 20--40deg. These variations are partly correlated with the local large-scale structure, which allowed us to estimate the emissivity of the local Universe in the energy band 2--10 keV at 9+/-4 x 10^{38} ers/sec/Mpc^{3}. The spectral energy distribution of the large-angular-scale variations is hard and is compatible with that of the CXB, which implies that normal galaxies and clusters of galaxies, whose spectra are typically much softer, do not contribute more than 15% to the total X-ray emissivity of the local Universe. Most of the observed CXB anisotropy (after exclusion of point sources with fluxes >10^{-11} erg/s/cm^2) can be attributed to low-luminosity AGNs
Molkov Sergei
Revnivtsev Mike
Sazonov Sergei
No associations
LandOfFree
Large-scale variations of the cosmic X-ray background and the X-ray emissivity of the local Universe does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Large-scale variations of the cosmic X-ray background and the X-ray emissivity of the local Universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large-scale variations of the cosmic X-ray background and the X-ray emissivity of the local Universe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-379030