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XMM-Newton spectroscopy of the metal depleted T Tauri star TWA 5
Neuhäuser, R.; Peres, G.; Stelzer, B. +2 more
We present results of X-ray spectroscopy for
The 90-110 µm dust feature in low to intermediate mass protostars: Calcite?
Maret, S.; Ceccarelli, C.; Chiavassa, A. +2 more
We present ISO spectra between 60 and 180 µm of 32 protostars of low to intermediate mass. About half of the spectra present a dust feature between ~90 and ~110 µm. We describe the observational characteristics of this feature, which seems to be due to one single carrier. In Class 0 sources the feature peaks around 100 µm, while …
The XMM-Newton Ω project
Bernard, J. -P.; Nichol, R. C.; Romer, A. K. +10 more
We study the gas mass fraction behavior in distant galaxy clusters observed within the XMM-Newton Ω project. The typical gas mass fraction fgas shape of high redshift galaxy clusters follows the global shape inferred at low redshift quite well, once scaled appropriately: the gas mass fraction increases with radius and flattens outward. …
A Starfish Preplanetary Nebula: IRAS 19024+0044
Sahai, Raghvendra; Sánchez Contreras, Carmen; Morris, Mark
Using the Hubble Space Telescope, we have imaged the OH/IR star IRAS 19024+0044 (I19024) at 0.6, 0.8, 1.1, and 1.6 µm, as part of our surveys of candidate preplanetary nebulae. The images show a multipolar nebula of size ~3.7"×2.3", with at least six elongated lobes emanating from the center of the nebula. Two of the lobes show limb-brighten…
Decay properties of the X-ray afterglows of gamma-ray bursts
Gendre, B.; Boër, M.
We present a set of seventeen Gamma-Ray Bursts (GRBs) with known redshifts and X-ray afterglow emission. We apply cosmological corrections in order to compare their fluxes normalized at a redshift of 1. Two classes of GRB can be defined using their X-ray afterglow light curves. We show that the brightest afterglows seem to decay faster than the di…
Diffuse X-Rays from the Arches and Quintuplet Clusters
Melia, Fulvio; Wang, Q. Daniel; Rockefeller, Gabriel +1 more
The origin and initial mass function of young stellar clusters near the Galactic center are still poorly understood. Two of the more prominent ones, the Arches and Quintuplet clusters, may have formed from a shock-induced burst of star formation, given their similar age and proximity to each other. Their unusual mass distribution, however, may be …
The correlation between coronal Doppler shifts and the supergranular network
Peter, H.; Lemaire, P.; Aiouaz, T.
We examine properties of line profiles as found with large raster scans of the solar corona acquired by the UV spectrometer SUMER on board SOHO. The observed regions include an equatorial coronal hole, a polar coronal hole, as well as surrounding quiet Sun areas. In order to reveal the network and remove strong local brightenings, a filter is appl…
The Discovery of More than 2000 White Dwarfs in the Globular Cluster ω Centauri
Prada Moroni, P. G.; Pulone, L.; Stetson, P. B. +9 more
We present deep multiband (F435W, F625W, and F658N) photometric data of the globular cluster ω Cen collected with the Advanced Camera for Surveys on board the Hubble Space Telescope. We identified in the (F435W - F625W, F435W)-plane more than 2000 white dwarf (WD) candidates using three out of nine available pointings. Such a large sample appears …
Further evidence for the presence of a neutron star in 4U 2206+54 . INTEGRAL and VLA observations
Mirabel, I. F.; Reig, P.; Torrejón, J. M. +5 more
The majority of High Mass X-ray Binaries (HMXBs) behave like X-ray pulsars, revealing that they contain a magnetised neutron star. Among the four HMXBs showing neither pulsations nor the characteristics of accreting black holes, there is the unusual HMXB
Discovery and study of the accreting pulsar 2RXP J130159.6-635806
Revnivtsev, M.; Lutovinov, A.; Chernyakova, M. +1 more
We report on analysis of the poorly studied source 2RXP J130159.6-635806 at different epochs with ASCA, BeppoSAX, XMM-Newton and INTEGRAL. The source shows coherent X-ray pulsations at a period ~700 s with an average spin-up rate of about . A broad-band (1-60 keV) spectral analysis of 2RXP J130159.6-635806 based on almost simultaneous XMM-Newton a…