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Discovery of the INTEGRAL X/γ-ray transient IGR J00291+5934: A Comptonised accreting ms pulsar?
Rodriguez, J.; Walter, R.; Eckert, D. +8 more
We report the discovery of a high-energy transient with the IBIS/ISGRI detector on board the INTEGRAL observatory. The source, namely
A survey of flux transfer events observed by Cluster during strongly northward IMF
Fazakerley, A. N.; Owen, C. J.; Lucek, E. A. +1 more
During Cluster's annual dayside seasons (November-June) the four spacecraft cross the magnetopause at high latitudes near local noon, and at lower latitudes further along the flanks. During these crossings, observations of flux transfer events (FTEs), a signature of transient or variable-rate magnetopause merging, are often made. We have compiled …
XMM-Newton observations of two transient millisecond X-ray pulsars in quiescence
Campana, S.; Stella, L.; Israel, G. L. +1 more
We report on XMM-Newton observations of two X-ray transient millisecond pulsars (XRTMSPs). We detected XTE J0929-314 with an unabsorbed luminosity of ∼ 7× 1031 erg s-1 (0.5-10 keV) at a fiducial distance of 10 kpc. The quiescent spectrum is consistent with a simple power law spectrum. The upper limit on the flux from a coolin…
Cool Customers in the Stellar Graveyard. II. Limits to Substellar Objects around Nearby DAZ White Dwarfs
Debes, John H.; Woodgate, Bruce E.; Sigurdsson, Steinn
Results from a concerted Hubble Space Telescope (HST) survey of nearby white dwarfs for substellar objects are presented. A total of seven DAZ white dwarfs with distances of <50 pc had high-contrast and high spatial resolution NICMOS coronagraphic images taken to search for candidate substellar objects at separations <~10" away. Limits to un…
The Far-Ultraviolet Spectrum of Z Camelopardalis in Quiescence and Standstill
Long, Knox S.; Drew, Janet E.; Froning, Cynthia S. +1 more
We have obtained FUSE (905-1187 Å) spectra of the nonmagnetic cataclysmic variable Z Cam during a period of quiescence. The spectrum resembles that of a hot (57,000 K) metal-enriched white dwarf. A high effective temperature is consistent with the expectation that dwarf nova systems that show standstills, as Z Cam does, have higher than normal tim…
The late merging phase of a galaxy cluster: XMM EPIC observations of A 3266
Pratt, G. W.; Belsole, E.; Sauvageot, J. L.
We present a mosaic of five XMM-Newton observations of the nearby (z=0.0594) merging galaxy cluster Abell 3266. We use the spectro-imaging capabilities of XMM-Newton to build precise (projected) temperature, entropy, pressure and Fe abundance maps. The temperature map exhibits a curved, large-scale hot region, associated with elevated entropy leve…
XMM-Newton spectral properties of the ultraluminous IRAS galaxy Mrk 273
Lutz, D.; Balestra, I.; Boller, Th. +2 more
We present a 23 ks XMM-Newton observation of the Ultraluminous Infrared Galaxy (ULIRG) Mrk 273. The hard X-ray spectrum can be modeled by a highly absorbed (~7×1023 cm-2) power law plus an Fe Kα emission line. The iron line (detected at more than 99% c.l.) is broad (σ=0.26+0.37-0.17 keV), suggesting poss…
X-rays from the Type II quasar in the hyperluminous infrared galaxy IRAS F15307+3252*
Iwasawa, K.; Fabian, A. C.; Crawford, C. S. +1 more
We report the detection of X-ray emission from the hyperluminous infrared galaxy IRAS F15307 + 3252 at z= 0.93 and its properties obtained from XMM-Newton observations. Although the X-ray emission is very faint and the data are noisy, a prominent line-like feature in the observed 3-4 keV range is inferred from both photometric and spectroscopic te…
Transition Region Downflows in the Impulsive Phase of Solar Flares
Brooks, D. H.; Kurokawa, H.; Kamio, S. +2 more
We present observations of four flares that occurred during coordinated observations between the Coronal Diagnostic Spectrometer (CDS) on board SOHO and the Domeless Solar Telescope (DST) at Hida Observatory. We studied the evolution of relative Doppler velocities in the flare kernels by using He I (3.5×104 K), O V (2.2×105 K…
XMM-Newton observations of AM CVn binaries
Cropper, M.; Ramsay, G.; Hakala, P. +3 more
We present the results of XMM-Newton observations of four AM CVn systems - AM CVn, CR Boo, HP Lib and GP Com. Their light curves show very different characteristics. The X-ray light curves show no coherent pulsations, suggesting the accreting white dwarfs have relatively low magnetic field strengths. Their spectra were best modelled using a multi-…