Search Publications
Galaxy group at z = 0.3 associated with the damped Lyman α system towards quasar Q1127-145
Kacprzak, Glenn G.; Churchill, Christopher W.; Murphy, Michael T.
We performed a spectroscopic galaxy survey, complete to mF814W <= 20.3 (LB > 0.15L*B at z = 0.3), within 100 × 100 arcsec2 of the quasar Q1127-145 (zem = 1.18). The Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph (UVES) quasar spectrum contains three zabs…
The helium spread in the globular cluster 47 Tuc
D'Antona, F.; Ventura, P.; Piotto, G. +2 more
Spectroscopy has shown the presence of CN band dichotomy and Na-O anticorrelations for 50-70 per cent of the investigated samples in the cluster 47 Tuc, otherwise considered a `normal' prototype of high-metallicity clusters from its photometric analysis. These anomalies are also found in main-sequence stars, suggesting that a consistent second gen…
Near-infrared dust and line emission from the central region of Mrk1066: constraints from Gemini NIFS
Storchi-Bergmann, Thaisa; Nagar, Neil M.; Riffel, Rogemar A.
We present integral field spectroscopy of the inner 700 × 700pc2 of the Seyfert galaxy Mrk1066 obtained with Gemini's Near-Infrared Integral Field Spectrograph (NIFS) at a spatial resolution of ~35pc. This high spatial resolution allowed us to observe, for the first time in this galaxy, an unresolved dust concentration with mass ~1.4 × …
Extreme flux states of NGC 4151 observed with INTEGRAL
Paltani, S.; Walter, R.; Ferrigno, C. +5 more
We present a comprehensive spectral analysis of all INTEGRAL data obtained so far for the X-ray-bright Seyfert galaxy NGC 4151. We also use all contemporaneous data from RXTE, XMM-Newton, Swift and Suzaku. We find a linear correlation between the medium- and hard-energy X-ray fluxes measured by INTEGRAL, which indicates an almost constant spectral…
Hard X-ray properties of magnetic cataclysmic variables
Hill, A. B.; Knigge, C.; Bird, A. J. +10 more
Hard X-ray surveys have proven remarkably efficient in detecting intermediate polars and asynchronous polars, two of the rarest type of cataclysmic variable (CV). Here, we present a global study of hard X-ray-selected intermediate polars and asynchronous polars, focusing particularly on the link between hard X-ray properties and spin/orbital perio…
Deep high-resolution X-ray spectra from cool-core clusters
Fabian, A. C.; Russell, H. R.; Sanders, J. S. +2 more
We examine deep XMM-Newton Reflection Grating Spectrometer (RGS) spectra from the cores of three X-ray bright cool-core galaxy clusters, Abell 262, Abell 3581 and HCG 62. Each of the RGS spectra shows FeXVII emission lines indicating the presence of gas around 0.5keV. There is no evidence for OVII emission which would imply gas at still cooler tem…
Measures of star formation rates from infrared (Herschel) and UV (GALEX) emissions of galaxies in the HerMES fields
Altieri, B.; Aussel, H.; Elbaz, D. +75 more
The reliability of infrared (IR) and ultraviolet (UV) emissions to measure star formation rates (SFRs) in galaxies is investigated for a large sample of galaxies observed with the Spectral and Photometric Imaging Receiver (SPIRE) and the Photodetector Array Camera and Spectrometer (PACS) instruments on Herschel as part of the Herschel Multi-Tiered…
HerMES: SPIRE Science Demonstration Phase maps†‡
Pérez-Fournon, I.; Franceschini, A.; Bock, J. +30 more
We describe the production and verification of sky maps of the five Spectral and Photometric Imaging Receiver (SPIRE) fields observed as part of the Herschel Multi-tiered Extragalactic Survey (HerMES) during the Science Demonstration Phase (SDP) of the Herschel mission. We have implemented an iterative map-making algorithm [The SPIRE-HerMES Iterat…
Herschel-SPIRE, far-infrared properties of millimetre-bright and -faint radio galaxies
Pérez-Fournon, I.; Rodighiero, G.; Ivison, R. J. +34 more
We present the first study of the far-infrared (FIR) properties of high-redshift, radio-selected ultraluminous infrared galaxies (ULIRGs) using deep observations obtained with the Spectral and Photometric Imaging Receiver (SPIRE) from the Herschel Multi-tiered Extragalactic Survey (HerMES). These galaxies span a large range of 850-µm fluxes …
Discovery of Compton-thick quasars in the Sloan Digital Sky Survey
Pozzi, F.; Alexander, D. M.; Vignali, C. +1 more
We present new and archival Chandra snapshot (~10ks each) observations of 15 optically identified [from the Sloan Digital Sky Survey (SDSS)] Type 2 quasars at z = 0.40-0.73. When combined with existing X-ray data, this work provides complete X-ray coverage for all 25 radio-quiet Type 2 quasars with logL[OIII] > 9.28Lsolar …