Showing papers by "Filippo Mannucci published in 2005"
TL;DR: In this article, the authors analyzed the soft X-ray emission in a wide area of the Sculptor supercluster by using overlapping ROSAT Position Sensitive Proportional Counter pointings.
Abstract: We have analysed the soft X-ray emission in a wide area of the Sculptor supercluster by using overlapping ROSAT Position Sensitive Proportional Counter 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 Munster Redshift Survey. In particular, we have analysed 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 the fact that this soft X-ray diffuse emission, and its correlation with the galaxy distribution, is significantly contributed by unresolved active galactic nuclei, groups 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.
39 citations
TL;DR: In this article, a large-scale structure traced by galaxies at z = 08, within the Lockman Hole, by means of multi-object spectroscopic observations was identified by using deep XMM images.
Abstract: We have identified a large-scale structure traced by galaxies at z = 08, within the Lockman Hole, by means of multi-object spectroscopic observations By using deep XMM images we have investigated the soft X-ray emission from the Warm-Hot Intergalactic Medium (WHIM) expected to be associated with this large-scale structure and we set a tight upper limit to its flux in the very soft 02-04 keV band The non-detection requires the WHIM at these redshifts to be cooler than 01 keV Combined with the WHIM emission detections at lower redshift, our result indicates that the WHIM temperature rapidly decreases with redshift, as expected in popular cosmological models
10 citations
01 Jan 2005
TL;DR: In this paper, the authors describe a few ongoing projects aimed at detecting dusty supernovae at near-IR wavelengths both in ground-based and HST images and to study their properties.
Abstract: Optical searches can detect supernovae (SNe) only if they suffer of a limited amount of dust extinction. This is a severe limitation as most of the core-collapse SNe could explode inside dusty regions. We describe a few ongoing projects aimed at detecting dusty SNe at near-IR wavelengths both in ground-based and HST images and to study their properties.