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Detailed afterglow modelling and host galaxy properties of the dark GRB 111215A
Kouveliotou, C.; Wijers, R. A. M. J.; Fynbo, J. P. U. +13 more
Gamma-ray burst (GRB) 111215A was bright at X-ray and radio frequencies, but not detected in the optical or near-infrared (nIR) down to deep limits. We have observed the GRB afterglow with the Westerbork Synthesis Radio Telescope and Arcminute Microkelvin Imager at radio frequencies, with the William Herschel Telescope and Nordic Optical Telescope…
The local stellar luminosity function and mass-to-light ratio in the near-infrared
Rybizki, J.; Dettbarn, C.; Jahreiß, H. +3 more
A new sample of stars, representative of the solar neighbourhood luminosity function (LF), is constructed from the Hipparcos catalogue and the Fifth Catalogue of Nearby Stars. We have cross-matched to sources in the Two Micron All Sky Survey catalogue so that for all stars individually determined near-infrared (NIR) photometry is available on a ho…
Fine Structure of Metric Type IV Radio Bursts Observed with the ARTEMIS-IV Radio-Spectrograph: Association with Flares and Coronal Mass Ejections
Hillaris, A.; Preka-Papadema, P.; Moussas, X. +5 more
Fine structures embedded in type IV burst continua may be used as diagnostics of the magnetic-field restructuring and the corresponding energy release associated with the low-corona development of flare or coronal mass ejection (CME) events. A catalog of 36 type IV bursts observed with the SAO receiver of the ARTEMIS-IV solar radio-spectrograph in…
A Direct Measurement of the Forward Shock Speed in Supernova Remnant 0509-67.5: Constraints on the Age, Ambient Density, Shock Compression Factor, and Electron-ion Temperature Equilibration
Hughes, John P.; Hovey, Luke; Eriksen, Kristoffer
Two Hubble Space Telescope narrow-band Hα images separated in time by 1.03 years are used for a proper motion measurement of the forward shock of the LMC supernova remnant 0509-67.5, the only spectroscopically confirmed LMC remnant of Ia origin. We measure a global shock speed of 6500 ± 200 km s-1 and constrain the pre-shock neutral hyd…
Constraint on noncommutative spacetime from PLANCK data
Chingangbam, Pravabati; Das, Subinoy; P. K., Joby
We constrain the energy scale of noncommutativity of spacetime using cosmic microwave background data from PLANCK. We find that PLANCK data put the lower bound on the noncommutativity energy scale to about 20 TeV, which is about a factor of 2 larger than a previous constraint that was obtained using data from WMAP, ACBAR and CBI. We further show t…
The Accreting Black Hole Swift J1753.5-0127 from Radio to Hard X-Ray
Done, Chris; Kaaret, Philip; Gandhi, Poshak +19 more
We report on multiwavelength measurements of the accreting black hole Swift J1753.5-0127 in the hard state at low luminosity (L ∼ 2.7 × 1036 erg s-1 assuming a distance of d = 3 kpc) in 2014 April. The radio emission is optically thick synchrotron, presumably from a compact jet. We take advantage of the low extinction (E(B-V)…
Dynamical analysis of galaxy cluster merger Abell 2146
Clowe, D. I.; Fabian, A. C.; McNamara, B. R. +12 more
We present a dynamical analysis of the merging galaxy cluster system Abell 2146 using spectroscopy obtained with the Gemini Multi-Object Spectrograph on the Gemini North telescope. As revealed by the Chandra X-ray Observatory, the system is undergoing a major merger and has a gas structure indicative of a recent first core passage. The system pres…
The relationship between mesoscale circulation and cloud morphology at the upper cloud level of Venus from VMC/Venus Express
Ignatiev, N. I.; Rodin, A. V.; Markiewicz, W. J. +4 more
The Venus Monitoring Camera (VMC) acquired a set of ultraviolet (UV) images during the Venus Express mission unprecedented in its duration from May 2006 to September 2013. Here we present the results of digital tracking of the cloud features in the upper cloud layer at latitudes 25-75°S using images from 257 orbits with the best spatial coverage. …
Magnetic forces associated with bursty bulk flows in Earth's magnetotail
Karlsson, Tomas; Nilsson, Hans; Hamrin, Maria +2 more
We present the first direct measurements of magnetic forces acting on bursty bulk flow plasma in the magnetotail. The magnetic forces are determined using Cluster multispacecraft measurements. We analyze 67 bursty bulk flow (BBF) events and show that the curvature part of the magnetic force is consistently positive, acting to accelerate the plasma…
Statistical altitude distribution of the auroral density cavity
Karlsson, T.; Li, B.; Marklund, G. T. +1 more
The statistical altitude distribution of auroral density cavities located between 3.0 and 6.5 RE is investigated using in situ observations from flux tubes exhibiting auroral acceleration. The locations of the observations are described using a pseudo altitude derived from the distribution of the parallel potential drop above and below …