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Evidence for precession of the isolated neutron star RX J0720.4-3125
Haberl, F.; de Vries, C. P.; Vink, J. +4 more
The XMM-Newton spectra of the isolated neutron star RX J0720.4-3125 obtained over 4.5 years can be described by sinusoidal variations in the inferred blackbody temperature, the size of the emitting area and the depth of the absorption line with a period of 7.1±0.5 years, which we suggest to be the precession period of the neutron star. Precession …
Converging Motion of Hα Conjugate Kernels: The Signature of Fast Relaxation of a Sheared Magnetic Field
Wang, Haimin; Ji, Haisheng; Huang, Guangli +4 more
In this Letter, we present the results from a high-cadence (~40 ms) Hα blue-wing observation of an M1.1-class solar flare, which occurred in NOAA AR 10687 on 2004 November 1. In collaboration with RHESSI, the observation was made with the Hα Fine Structure Telescope at the GanYu Solar Station of the Purple Mountain Observatory. For this flare, a p…
Cassini RADAR observations of Enceladus, Tethys, Dione, Rhea, Iapetus, Hyperion, and Phoebe
Black, Gregory J.; Lorenz, Ralph D.; Hensley, Scott +17 more
Cassini 2.2-cm radar and radiometric observations of seven of Saturn's icy satellites yield properties that apparently are dominated by subsurface volume scattering and are similar to those of the icy Galilean satellites. Average radar albedos decrease in the order Enceladus/Tethys, Hyperion, Rhea, Dione, Iapetus, and Phoebe. This sequence most li…
Further constraints on the evolution of Ks-selected galaxies in the GOODS/CDFS field
McLure, R. J.; Dunlop, J. S.; Cirasuolo, M. +2 more
We have selected and analysed the properties of a sample of 2905 Ks < 21.5 galaxies in ~131arcmin2 of the Great Observatories Origins Deep Survey (GOODS) Chandra Deep Field South (CDFS), to obtain further constraints on the evolution of Ks-selected galaxies with respect to the results already obtained in previou…
IGR J11215-5952: a hard X-ray transient displaying recurrent outbursts
Mereghetti, S.; Sidoli, L.; Paizis, A.
Context: .The hard X-ray source IGR J11215-5952 has been discovered with INTEGRAL during a short outburst in 2005 and proposed as a new member of the class of supergiant fast X-ray transients.
Aims: .We analysed INTEGRAL public observations of the source field in order to search for previous outbursts from this transient, not reported in liter…
Dissipation of the Perpendicular Turbulent Cascade in the Solar Wind
Hollweg, Joseph V.; Smith, Charles W.; Vasquez, Bernard J. +1 more
The core solar wind protons are observed to be heated perpendicularly to the magnetic field. This is taken to be a signature of the cyclotron damping of the turbulent fluctuations, which are thought to be responsible for the heating. At the same time, it is commonly accepted that the turbulent cascade produces mostly highly oblique (quasi-two-dime…
On the Rates of Coronal Mass Ejections: Remote Solar and In Situ Observations
Cane, H. V.; Gopalswamy, N.; Richardson, I. G. +2 more
We compare the rates of coronal mass ejections (CMEs) as inferred from remote solar observations and interplanetary CMEs (ICMEs) as inferred from in situ observations at both 1 AU and Ulysses from 1996 through 2004. We also distinguish between those ICMEs that contain a magnetic cloud (MC) and those that do not. While the rates of CMEs and ICMEs t…
INTEGRAL survey of the Cassiopeia region in hard X rays
Vink, J.; Kuiper, L.; Hermsen, W. +3 more
We report on the results of a deep 1.6 Ms INTEGRAL observation of the Cassiopeia region performed from December 2003 to February 2004. Eleven sources were detected with the imager IBIS-ISGRI at energies above 20 keV, including three new hard X-ray sources. Most remarkable is the discovery of hard X-ray emission from the anomalous X-ray pulsar 4U 0…
Frequency of Hot Jupiters and Very Hot Jupiters from the OGLE-III Transit Surveys toward the Galactic Bulge and Carina
Udalski, A.; Gould, A.; Gaudi, B. S. +1 more
We derive the frequencies of hot Jupiters (HJs) with 3-5 day periods and very hot Jupiters (VHJs) with 1-3 day periods by comparing the planets actually detected in the OGLE-III survey with those predicted by our models. The models are constructed following Gould and Morgan (2003) by populating the line of sight with stars drawn from the Hipparcos…
INTEGRAL and XMM-Newton observations of LSI +61° 303
Walter, R.; Chernyakova, M.; Neronov, A.
LSI +61° 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy γ-ray emission have been observed. We present XMM-Newton and INTEGRAL observations which reveal variability of the X-ray spectral index of the system. The X-ray spectrum is hard (photon index Γ ~= 1.5) during the orbital phases of both high a…