scholarly journals Compton-Thick AGN: The Dark Side of the X-Ray Background

2004 ◽  
pp. 245-272 ◽  
Author(s):  
Andrea Comastri
Keyword(s):  
Dark Side ◽  
X Ray ◽  
X Ray Background

scholarly journals On the Zero-Level of the Soft X-ray Background

1997 ◽  
Vol 166 ◽  
pp. 113-116
Author(s):  
M.J. Freyberg
Keyword(s):  
Count Rate ◽  
Galactic Halo ◽  
Geomagnetic Storms ◽  
Dark Side ◽  
Dimensional Structure ◽  
Variable Component ◽  
X Ray ◽  
3 Dimensional ◽  
Sky Survey ◽  
X Ray Background

AbstractThe soft X-ray background (SXRB, 0.1 – 2.0 keV) is generally believed to be comprised of a local component, the Local (Hot) Bubble (LHB), which is only marginally absorbed, and of distant emission (galactic halo, extragalactic background). It is vital to know the foreground emission (spectrum, intensity) if one wants to disentangle and determine the 3-dimensional structure of the X-ray emitting regions. During the ROSAT PSPC All-Sky Survey non-cosmic enhancements of the measured X-ray count rate have been observed. These lasted typically for up to 8 hours (i.e. a couple of orbits). Using PSPC data it has been shown that these so-called “long-term enhancements” (LXE) are related to geomagnetic storms and variations of the solar wind. Moreover, during an observation of the comet Hyakutake indications for a correlation of the X-ray background with the X-ray brightness of the comet have been found. This can be interpreted in terms of an X-ray emitting region around the Earth. Although the variable component of these enhancements could be subtracted from the sky maps an uncertainty remained concerning an undetected and relatively constant contribution which might be present in soft X-ray observations. As a consequence this could explain or contribute to the high PSPC count rate observed from the dark side of the Moon.

scholarly journals The unified Seyfert scheme and the origin of the cosmic X-ray background

1994 ◽  
Vol 270 (1) ◽  
pp. L17-L21 ◽  
Author(s):  
P. Madau ◽  
G. Ghisellini ◽  
A. C. Fabian
Keyword(s):  
X Ray ◽  
X Ray Background

scholarly journals The X-ray background and the deep X-ray surveys

2004 ◽  
Vol 34 (12) ◽  
pp. 2470-2477 ◽  
Author(s):  
R. Gilli
Keyword(s):  
X Ray ◽  
X Ray Background

scholarly journals Using the maximum X-ray flux ratio and X-ray background to predict solar flare class

Space Weather ◽  
2015 ◽  
Vol 13 (5) ◽  
pp. 286-297 ◽  
Author(s):  
L. M. Winter ◽  
K. Balasubramaniam
Keyword(s):  
Solar Flare ◽  
Flux Ratio ◽  
X Ray ◽  
X Ray Background

scholarly journals THE SPACE DENSITY OF COMPTON-THICK ACTIVE GALACTIC NUCLEUS AND THE X-RAY BACKGROUND

2009 ◽  
Vol 696 (1) ◽  
pp. 110-120 ◽  
Author(s):  
E. Treister ◽  
C. Megan Urry ◽  
Shanil Virani
Keyword(s):  
Active Galactic Nucleus ◽  
Space Density ◽  
X Ray ◽  
X Ray Background

The X-ray background and the census of quasars

2001 ◽  
Author(s):  
Amy J. Barger
Keyword(s):  
X Ray ◽  
X Ray Background

scholarly journals Large-scale variations of the cosmic X-ray background and the X-ray emissivity of the local Universe

2008 ◽  
Vol 483 (2) ◽  
pp. 425-435 ◽  
Author(s):  
M. Revnivtsev ◽  
S. Molkov ◽  
S. Sazonov
Keyword(s):  
Large Scale ◽  
Local Universe ◽  
X Ray ◽  
X Ray Background
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