Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-24
Mon.Not.Roy.Astron.Soc. 357 (2005) 929-936
Astronomy and Astrophysics
Astrophysics
8 pages, 6 figures, submitted to MNRAS; Version 2: some major changes due to a bug found in the image analysis code. The main
Scientific paper
10.1111/j.1365-2966.2005.08699.x
We have analyzed the soft X-ray emission in a wide area of the Sculptor supercluster by using overlapping ROSAT PSPC pointings. After subtraction of the point sources we have found evidence for extended, diffuse soft X-ray emission. We have investigated the nature of such extended emission through the cross-correlation with the density of galaxies as inferred from the Muenster Redshift Survey. In particular we have analyzed the correlation as a function of the temperature of the X-ray emitting gas. We have found a significant correlation of the galaxy distribution only with the softest X-ray emission (0.1--0.3 keV) and only for gas temperatures kT < 0.5 keV. We have excluded that this soft X-ray diffuse emission, and its correlation with the galaxy distribution, is significantly contributed by unresolved AGN, group of galaxies or individual galaxies. The most likely explanation is that the soft, diffuse X-ray emission is tracing Warm-Hot Intergalactic Medium, with temperatures below 0.5 keV, associated with the large-scale structures in the Sculptor supercluster.
Gilli Roberto
Maiolino Roberto
Mannucci Filippo
Schuecker Peter
Zappacosta Luca
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