Fabrizio Nicastro

TL;DR: In this paper, the authors investigated the power spectrum of the unresolved 0.5-2 keV CXB with deep Chandra 4Ms observations in the CDFS and interpreted the signal as the joint contribution of clustered undetected sources like AGN, Galaxies and Inter-Galactic Medium (IGM).

TL;DR: In this paper, an active galactic nucleus (AGN) pair was discovered in the interacting galaxy system IRAS 20210+1121 at z = 0.056, where the X-ray primary continuum from the nucleus appears totally depressed in the XMM-Newton band as expected in the case of a Compton-thick absorber.

TL;DR: In this article, the authors report on the presence of large amounts of million-degree gas in the Milky Way's interstellar and circum-galactic medium and show that a vast, ~6 kpc radius, spherically symmetric central region of the Milky way above and below the 0.16 kpc thick plane has either been emptied of hot gas or the density of this gas within the cavity has a peculiar profile, increasing from the center up to a radius of ~ 6 kpc, and then decreasing with a typical halo density profile.

TL;DR: In this paper, the authors make use of a 500ks Chandra HRC-S/LETG spectrum of the blazar H2356-309, combined with a lower S/N spectrum, to search for the presence of warm-hot absorbing gas associated with two large-scale structures (LSSs) crossed by this sightline at z=0.062 (the Pisces-Cetus Supercluster, PCS) and at z =0.128 ("Farther Sculptor Wall", FSW).

TL;DR: In this paper, Chandra high energy transmission grating spectra of the narrow-line Seyfert-1 galaxy Ark 564 were presented and the strongest lines were identified as K? transitions of O VII (two lines) and O VI (one line) at outflow velocities of 0.1c.