Search Publications
A Near-Infrared Analysis of the Submillimeter Background and the Cosmic Star-Formation History
Wang, W. -H.; Barger, A. J.; Cowie, L. L.
We use new deep NIR and MIR observations to analyze the 850 µm image of the GOODS-N region. We show that much of the submillimeter background is picked out by sources with H(AB) or 3.6 µm(AB)<23.25 (1.8 µJy). These sources contribute an 850 µm background of 24+/-2 Jy deg-2. This is a much higher fraction of th…
The X-ray emission of the supernova remnant W49B observed with XMM-Newton
Ballet, J.; Miceli, M.; Bocchino, F. +4 more
Context.In the framework of the study of supernova remnants and their complex interaction with the interstellar medium, we report on an XMM-Newton EPIC observation of the Galactic supernova remnant W49B.
Aims.We investigated the spatial distribution of the chemical and physical properties of the plasma, so as to get important constraints on the…
XMM-Newton Observations of the Supernova Remnant IC 443. I. Soft X-Ray Emission from Shocked Interstellar Medium
Troja, E.; Bocchino, F.; Reale, F.
The shocked interstellar medium around IC 443 produces strong X-ray emission in the soft energy band (E<~1.5 keV). We present an analysis of such emission as observed with the EPIC MOS cameras on board the XMM-Newton observatory, with the purpose to find clear signatures of the interactions with the interstellar medium (ISM) in the X-ray band, …
Constraints on Type Ia supernova progenitor time delays from high-z supernovae and the star formation history
Wolf, C.; Förster, F.; Podsiadlowski, Ph. +1 more
We re-assess the question of a systematic time delay between the formation of the progenitor and its explosion in a Type Ia supernova (SN Ia) using the Hubble Higher-z Supernova Search sample. While a previous analysis indicated a significant time delay, with a most likely value of 3.4 Gyr, effectively ruling out all previously proposed progenitor…
The AGN Outflow in the HDF-S Target QSO J2233-606 from a High-Resolution VLT UVES Spectrum
Arav, Nahum; Kim, Tae-Sun; Gabel, Jack R.
We present a detailed analysis of the intrinsic UV absorption in the central HDF-S target QSO J2233-606, based on a high-resolution, high-S/N (~25-50) spectrum obtained with VLT UVES. This spectrum samples the cluster of intrinsic absorption systems outflowing from the AGN at radial velocities v~-5000 to -3800 km s-1 in the key far-UV d…
An Investigation into the Variability of Heating in a Solar Active Region
Winebarger, Amy R.; Warren, Harry P.; Ugarte-Urra, Ignacio
Previous studies have indicated that both steady and impulsive heating mechanisms play a role in active region heating. In this paper, we present a study of 20 hours of soft X-ray and EUV observations of solar active region NOAA AR 8731. We examine the evolution of six representative loop structures that brighten and fade first from X-ray images a…
The XMM Large-Scale Structure survey: a well-controlled X-ray cluster sample over the D1 CFHTLS area
Maccagni, D.; Chiappetti, L.; Altieri, B. +24 more
We present the XMM Large-Scale Structure Survey (XMM-LSS) cluster catalogue corresponding to the Canada-France-Hawaii Telescope Legacy Survey D1 area. The list contains 13 spectroscopically confirmed, X-ray selected galaxy clusters over 0.8deg2 to a redshift of unity and so constitutes the highest density sample of clusters to date. Clu…
Enrichment in the Centaurus cluster of galaxies
Fabian, A. C.; Sanders, J. S.
We perform a detailed spatially resolved, spectroscopic, analysis of the core of the Centaurus cluster of galaxies using a deep Chandra X-ray observation and XMM-Newton data. The Centaurus cluster core has particularly high metallicity, up to twice the solar values, and we measure the abundances of Fe, O, Ne, Mg, Si, S, Ar, Ca and Ni. We map the d…
The Evolution of the Mass Function Split by Morphology up to Redshift 1 in the FORS Deep and the GOODS-S Fields
Pannella, M.; Salvato, M.; Saglia, R. P. +5 more
We study the evolution of the stellar mass density for the separate families of bulge-dominated and disk-dominated galaxies over the redshift range 0.25<=z<=1.15. We derive quantitative morphology for a statistically significant galaxy sample of 1645 objects selected from the FORS Deep Field and the GOODS-S field. We find that the morphologi…
Do Ultraluminous X-Ray Sources Really Contain Intermediate-Mass Black Holes?
Ebisawa, Ken; Mineshige, Shin; Kawaguchi, Toshihiro +1 more
An open question remains whether Ultraluminous X-ray Sources (ULXs) really contain intermediate-mass black holes (IMBHs). We carefully investigated the XMM-Newton EPIC spectra of four ULXs that were claimed to be strong candidates of IMBHs by several authors. We first tried fitting by the standard spectral model of disk blackbody (DBB) + power-law…