Search Publications
The CHESS spectral survey of star forming regions: Peering into the protostellar shock L1157-B1. I. Shock chemical complexity
Falgarone, E.; Maret, S.; Codella, C. +66 more
We present the first results of the unbiased survey of the L1157-B1 bow shock, obtained with HIFI in the framework of the key program Chemical HErschel Survey of Star forming regions (CHESS). The L1157 outflow is driven by a low-mass Class 0 protostar and is considered the prototype of the so-called chemically active outflows. The bright blue-shif…
The fundamental plane of EDisCS galaxies. The effect of size evolution
Pelló, R.; White, S. D. M.; Poggianti, B. +15 more
We study the evolution of spectral early-type galaxies in clusters, groups, and the field up to redshift 0.9 using the ESO Distant Cluster Survey (EDisCS) dataset. We measure structural parameters (circularized half-luminosity radii Re, surface brightness Ie, and velocity dispersions σ) for 154 cluster and 68 field galaxies. …
Cold fronts in galaxy clusters
Rossetti, M.; Molendi, S.; Ghizzardi, S.
Context. Cold fronts have been observed in several galaxy clusters. Understanding their nature and origin is extremely important for investigating the internal dynamics of clusters.
Aims: To gain insight into the nature of these features, we carry out a statistical investigation of their occurrence in a sample of galaxy clusters observed with…
The Herschel Lensing Survey (HLS): Overview
Smail, I.; Kneib, J. -P.; Smith, G. P. +32 more
The Herschel Lensing Survey (HLS) will conduct deep PACS and SPIRE imaging of ~40 massive clusters of galaxies. The strong gravitational lensing power of these clusters will enable us to penetrate through the confusion noise, which sets the ultimate limit on our ability to probe the Universe with Herschel. Here we present an overview of our survey…
Asymmetries of solar coronal extreme ultraviolet emission lines
Peter, H.
Context. The profiles of emission lines formed in the corona contain information on the dynamics and the heating of the hot plasma. Only recently has data with sufficiently high spectral resolution become available for investigating the details of the profiles of emission lines formed well above 106 K. These show enhanced emission in th…
Variations of the spectral index of dust emissivity from Hi-GAL observations of the Galactic plane
de Bernardis, P.; Masi, S.; Montier, L. +14 more
Context. Variations in the dust emissivity are critical for gas mass determinations derived from far-infrared observations, but also for separating dust foreground emission from the Cosmic Microwave Background (CMB). Hi-GAL observations allow us for the first time to study the dust emissivity variations in the inner regions of the Galactic plane a…
The intriguing nature of the high-energy gamma ray source XSS J12270-4859
Mukai, K.; Belloni, T.; de Martino, D. +7 more
Context. The nature of the hard X-ray source XSS J12270-4859 is still unclear. It was claimed to be a possible magnetic cataclysmic variable of the Intermediate Polar type from its optical spectrum and a possible 860 s X-ray periodicity in RXTE data. However, recent observations do not support the latter variability, leaving this X-ray source stil…
Cross-calibrating X-ray detectors with clusters of galaxies: an IACHEC study
Guainazzi, M.; David, L.; Nevalainen, J.
Aims: We used a sample of 11 nearby relaxed clusters of galaxies observed with the X-ray instruments XMM-Newton (EPIC) pn and MOS, Chandra ACIS-S and ACIS-I and BeppoSAX MECS to examine the cross-calibration of the energy dependence and normalisation of the effective area of these instruments as of December 2009. We also examined the Fe XXV/X…
The X-ray to [Ne V]3426 flux ratio: discovering heavily obscured AGN in the distant Universe
Vignali, C.; Gilli, R.; Comastri, A. +3 more
We investigate the possibility of using the ratio between the 2-10 keV flux and the [Ne V]3426 emission line flux (X/NeV) as a diagnostic diagram to discover heavily obscured, possibly Compton-thick active galactic nuclei (AGN) in the distant Universe. While it is on average about one order of magnitude fainter than the more commonly used [O III]5…
A systematic analysis of the broad iron Kα line in neutron-star LMXBs with XMM-Newton
Díaz Trigo, M.; Cadolle Bel, M.; Migliari, S. +1 more
We analysed the XMM-Newton archival observations of 16 neutron star (NS), low-mass X-ray binaries (LMXBs) to study the Fe K emission in these objects. The sample includes all the observations of NS LMXBs performed in EPIC pn timing mode with XMM-Newton publicly available until September 30, 2009. We performed a detailed data analysis considering p…