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Title:
X-Ray Constraints on the Warm-Hot Intergalactic Medium
Authors:
Kuntz, K. D.; Snowden, S. L.; Mushotzky, R. F.
Affiliation:
AA(Department of Astronomy, University of Maryland, College Park, MD 20742; ), AB(NASA Goddard Space Flight Center, Greenbelt, MD 20771; , ; Universities Space Research Association.), AC(NASA Goddard Space Flight Center, Greenbelt, MD 20771; , )
Publication:
The Astrophysical Journal, Volume 548, Issue 2, pp. L119-L122. (ApJ Homepage)
Publication Date:
02/2001
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Cosmology: Diffuse Radiation, X-Rays: ISM
DOI:
10.1086/319117
Bibliographic Code:
2001ApJ...548L.119K

Abstract

Three observational constraints can be placed on a warm-hot intergalactic medium (WHIM) using ROSAT Position Sensitive Proportional Counter pointed observations and survey data: the emission strength, the energy spectrum, and the fluctuation spectrum. The upper limit to the emission strength of the WHIM is 7.5+/-1.0 keV s-1 cm-2 sr-1 keV-1 in the 3/4 keV band, an unknown portion of which value may be due to our own Galactic halo. The spectral shape of the WHIM emission can be described as thermal emission with logT=6.42, although the true spectrum is more likely to come from a range of temperatures. The values of the emission strength and spectral shape are in reasonable agreement with hydrodynamical cosmological models. The autocorrelation function in the 0.44 keV < E<1.21 keV band range, w(θ), for the extragalactic soft X-ray background (SXRB), which includes both the WHIM and the contributions due to point sources, is <~0.002 for 10'<θ<20' in the 3/4 keV band. This value is lower than the Croft et al. cosmological model by a factor of ~5 but is still not inconsistent with cosmological models. It is also found that the normalization of the extragalactic power-law component of the SXRB spectrum must be 9.5+/-0.9 keV s-1 cm-2 sr-1 keV-1 to be consistent with the ROSAT All-Sky Survey.
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