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Faint supernovae and supernova impostors: case studies of SN 2002kg/NGC 2403-V37 and SN 2003gm
Smartt, S. J.; Bresolin, F.; Maund, J. R. +6 more
Photometric and spectroscopic observations of the faint Supernovae (SNe) 2002kg and 2003gm, and their precursors, in NGC 2403 and NGC 5334, respectively, are presented. The properties of these SNe are discussed in the context of previously proposed scenarios for faint SNe: low-mass progenitors producing underenergetic SNe; SNe with ejecta constrai…
Plasma Moments in the Environment of Mars. Mars Express ASPERA-3 Observations
Coates, A. J.; Fedorov, A.; Barabash, S. +7 more
We present the first electron and ion moment maps (density, velocity and temperature) of the martian plasma environment, using data from the ELS and IMA sensors of the ASPERA-3 experiment onboard Mars Express. Moments are calculated by integration and by Gaussian fits to the phase space distribution. The methods of calculation and the calibration …
The 1-1000µm spectral energy distributions of far-infrared galaxies
Dole, H.; Lagache, G.; Scott, D. +3 more
Galaxies selected at 170µm by the Infrared Space Observatory (ISO) Far-IR BACKground (FIRBACK) survey represent the brightest ~10 per cent of the cosmic infrared background. Examining their nature in detail is therefore crucial for constraining models of galaxy evolution. Here, we combine Spitzer archival data with previous near-infrared (ne…
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…