Search Publications
X-ray and strong lensing mass estimate of MS2137.3-2353
Ettori, S.; Donnarumma, A.; Meneghetti, M. +1 more
We present new mass estimates of the cluster of galaxies MS2137.3-2353, inferred from X-ray and strong lensing analyses. This cluster exhibits an outstanding strong lensing configuration and indicates a well-relaxed dynamical state, being most suitable for a mass reconstruction which combines both techniques. Despite this, several previous studies…
A Suzaku observation of the ULIRG IRAS19254-7245: discerning the AGN component
Ptak, A.; Reeves, J. N.; Braito, V. +3 more
We discuss a long Suzaku observation of IRAS 19254-7245 (also known as the Superantennae), one of the brightest and well studied Ultra Luminous Infrared Galaxies in the local Universe. This long observation provided the first detection of IRAS 19254-7245 above 10 keV, and a measurement of a 15-30 keV flux of ~5× 10-12 erg cm-2
On 2 1.27 µm emission maps as derived from OMEGA/MEx data
Bibring, J. -P.; Gondet, B.; Bellucci, G. +4 more
We present a method to derive the 2D maps of the O 2 (a 1Δg) airglow emission at 1.27 µm from the OMEGA/MEx nadir observations. The OMEGA imaging capabilities allow monitoring the 2D distribution, daily and seasonal variation of the O 2 emission intensities with a detection limit of 4 MR. The highe…
IRTF observations of white dwarfs with possible near-infrared excess
Farihi, J.
Near-infrared photometry and spectroscopy are obtained for a heterogeneous sample of nearby white dwarfs with possible excess flux as identified primarily in the Two Micron All Sky Survey. Among the sample of 43 stars are a number of white dwarfs that are either metal-rich, magnetic or binary suspects. With a few notable exceptions in four (or pos…
The early phase of a H1743-322 outburst observed by INTEGRAL, RXTE, Swift, and XMM/Newton
Rodriguez, J.; Wilms, J.; Cadolle Bel, M. +7 more
Aims: We investigate the early phase of the first state change during the 2008 September-November outburst of H1743-322, first detected by the INTEGRAL satellite. We focus on the preliminary hard X-ray state with the aim of investigating the possible influence of this phase on the subsequent evolution during the outburst.
Methods: The outburst…
Evidence of a link between the evolution of clusters and their AGN fraction
Simpson, Chris; Rawlings, Steve; Jarvis, Matt J. +9 more
We discuss the optical properties, X-ray detections and active galactic nucleus (AGN) populations of four clusters at z ~ 1 in the Subaru-XMM Deep Field (SXDF). The velocity distribution and plausible extended X-ray detections are examined, as well as the number of X-ray point sources and radio sources associated with the clusters. We find that th…
High-dispersion Spectrum of the Halo Planetary Nebula DdDm 1
Izumiura, Hideyuki; Otsuka, Masaaki; Hyung, Siek +2 more
Using the High Dispersion Spectrograph (HDS) at the Subaru Telescope, we secured the high-resolution line spectra in the 3600-7500 Å wavelength range of the Galactic halo planetary nebula DdDm 1. We also analyzed the Hubble Space Telescope Faint Object Spectrograph data in the 1200-6730 Å wavelength range. The diagnostic results indicate the elect…
Limb observations of CO2 and CO non-LTE emissions in the Venus atmosphere by VIRTIS/Venus Express
Erard, S.; López-Valverde, M. A.; Gilli, G. +3 more
We report and analyze here observations of strong infrared emissions from the limb of the Venus upper atmosphere during daytime, taken by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) aboard Venus Express. We focus on the measurements taken during the first 4 months of nominal operations. The emissions observed at 4.3 µm and…
Constraining star formation and AGN in z ~ 2 massive galaxies using high-resolution MERLIN radio observations
Muxlow, T. W. B.; Alexander, D. M.; Conselice, C. J. +3 more
We present high spatial resolution Multi-Element Radio-Linked Interferometer Network (MERLIN) 1.4-GHz radio observations of two high-redshift (z ~ 2) sources, RGJ123623 (HDF147) and RGJ123617 (HDF130), selected as the brightest radio sources from a sample of submillimetre-faint radio galaxies. They have starburst classifications from their rest-fr…
Grain Growth and Global Structure of the Protoplanetary Disk Associated with the Mature Classical T Tauri Star, PDS 66
Pascucci, Ilaria; Schneider, Glenn; Hines, Dean C. +4 more
We present Australia Telescope Compact Array interferometric observations of the old (13 Myr), nearby (86 pc) classical T Tauri star (cTTS), PDS 66. Unresolved 3 and 12 mm continuum emission is detected toward PDS 66, and upper limits are derived for the 3 and 6 cm flux densities. The millimeter-wave data show a spectral slope flatter than that ex…