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Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL. II. The environment of the companion star
Pantin, E.; Chaty, S.; Rahoui, F. +1 more
Context: The INTEGRAL mission has led to the discovery of a new type of supergiant X-ray binaries (SGXBs), whose physical properties differ from those of previously known SGXBs. Those sources are in the course of being unveiled by means of multi-wavelength X-rays, optical, near- and mid-infrared observations, and two classes are appearing. The fir…
Compositional mapping of Saturn's satellite Dione with Cassini VIMS and implications of dark material in the Saturn system
Nicholson, Philip D.; Baines, Kevin H.; Buratti, Bonnie J. +9 more
Cassini VIMS has obtained spatially resolved imaging spectroscopy data on numerous satellites of Saturn. A very close fly-by of Dione provided key information for solving the riddle of the origin of the dark material in the Saturn system. The Dione VIMS data show a pattern of bombardment of fine, sub-0.5-µm diameter particles impacting the s…
Constraints on decaying dark matter from XMM-Newton observations of M31
Boyarsky, Alexey; Ruchayskiy, Oleg; Iakubovskyi, Dmytro +1 more
We derive constraints on the parameters of the radiatively decaying dark matter (DM) particle, using the XMM-Newton EPIC spectra of the Andromeda galaxy (M31). Using the observations of the outer (5-13arcmin) parts of M31, we improve the existing constraints. For the case of sterile neutrino DM, combining our constraints with the latest computatio…
Wavelengths and Intensities of Spectral Lines in the 171-211 and 245-291 Å Ranges from Five Solar Regions Recorded by the Extreme-Ultraviolet Imaging Spectrometer (EIS) on Hinode
Brown, C. M.; Hara, H.; Feldman, U. +2 more
We present spectral line wavelengths, identifications, and intensities in the 171-211 and 245-291 Å ranges from five solar plasma regions recorded by the Extreme-Ultraviolet Imaging Spectrometer (EIS) on Hinode. The recorded data were emitted from a quiet region, two active areas on the solar disk, a limb region, and a region 20'' above the limb. …
Polarization of the Crab Pulsar and Nebula as Observed by the INTEGRAL/IBIS Telescope
Grenier, I. A.; Laurent, P.; Lebrun, F. +2 more
Neutron stars generate powerful winds of relativistic particles that form bright synchrotron nebulae around them. Polarimetry provides a unique insight into the geometry and magnetic configuration of the wind, but high-energy measurements have failed until recently. The INTEGRAL/IBIS telescope has been used in its Compton mode to search for linear…
The Spatial Structure of an Accretion Disk
Kochanek, Christopher S.; Poindexter, Shawn; Morgan, Nicholas
Based on the microlensing variability of the two-image gravitational lens HE 1104-1805 observed between 0.4 and 8 µm, we have measured the size and wavelength-dependent structure of the quasar accretion disk. Modeled as a power law in temperature, T propto R-β, we measure a B-band (0.13 µm in the rest frame) half-light radiu…
An update to a Saturnian longitude system based on kilometric radio emissions
Gurnett, D. A.; Kurth, W. S.; Averkamp, T. F. +2 more
The period of Saturn kilometric radiation modulation as determined by Voyager forms the basis for a longitude system (SLS) recognized by the International Astronomical Union. However, Ulysses and Cassini observations have shown that this modulation period varies by the order of one percent on timescales of a few years and, hence, does not represen…
A systematic look at the very high and low/hard state of GX339-4: constraining the black hole spin with a new reflection model
Fabian, A. C.; Miller, J. M.; Miniutti, G. +3 more
We present a systematic study of GX 339-4 in both its very high and low hard states from simultaneous observations made with XMM-Newton and RXTE in 2002 and 2004. The X-ray spectra of both these extreme states exhibit strong reflection signatures, with a broad, skewed Fe Kα line clearly visible above the continuum. Using a newly developed, self-co…
Dynamical Centers and Noncircular Motions in THINGS Galaxies: Implications for Dark Matter Halos
Walter, F.; Brinks, E.; de Blok, W. J. G. +2 more
We present harmonic decompositions of the velocity fields of 19 galaxies from The H I Nearby Galaxy Survey (THINGS) which quantify the magnitude of the noncircular motions in these galaxies and yield observational estimates of the elongations of the dark matter halo potentials. Additionally, we present accurate dynamical center positions for these…
Magnetic Field Overlying Solar Eruption Regions and Kink and Torus Instabilities
Liu, Y.
Using a potential field source surface (PFSS) model, we study a magnetic field overlying erupted filaments in solar active regions. The filaments studied here were reported to experience a kink instability or a torus instability. The torus instability leads to a full eruption, while the kink instability leads to a full eruption or a failed eruptio…