Search Publications
Gray hematite distribution and formation in Ophir and Candor chasmata
Weitz, Catherine M.; Lane, Melissa D.; Staid, Matthew +1 more
We have studied eight of the spatially largest locations in Ophir and Candor chasmata that have the highest abundances of coarse-grained gray hematite, as measured by the Mars Global Surveyor Thermal Emission Spectrometer (TES). All of the eight hematite locations correspond to relatively smooth dark units that overlie or are adjacent to light-ton…
The red and blue galaxy populations in the GOODS field: evidence for an excess of red dwarfs
Castellano, M.; Pentericci, L.; Fontana, A. +8 more
Aims: We study the evolution of the galaxy population up to z∼ 3 as a function of its colour properties. In particular, luminosity functions and luminosity densities were derived as a function of redshift for the blue/late and red/early populations.
Methods: We use data from the GOODS-MUSIC catalogue, which have typical magnitude limits z…
Physical and Chemical Inhomogeneities Inside the Vela SNR Shell: Indications of Ejecta Shrapnels
Miceli, M.; Bocchino, F.; Reale, F.
We present the results of the combined analysis of three XMM-Newton EPIC observations of the northern rim of the Vela supernova remnant (SNR). The three pointings cover an area of gtrsim10 pc2 (at 250 pc) behind the main shock front, and we aim to study with high resolution the spatial distribution of the physical and chemical propertie…
Lower hybrid waves at the shock front: a reassessment
André, M.; Dunlop, M. W.; Walker, S. N. +3 more
The primary process occurring at a collisionless shock is the redistribution of the bulk upstream energy into other degrees of freedom. One part of this process results in the acceleration of electrons at the shock front. Accelerated electrons are observed at the terrestrial and other planetary shocks, comets, and their effects are observed in ast…
On the Penumbral Jetlike Features and Chromospheric Bow Shocks
Title, A.; Berger, T.; Frank, Z. +1 more
We present observations of sunspot penumbrae obtained during the disk passage of AR 10923 (2006 November 10-20) with the SOT instrument on Hinode in 4305 Å G band and Ca II λ3968 H line. Along with recently discovered jetlike features (Katsukawa et al. 2007), we find other kinds of bright elongated transients abundantly pervading the entire penumb…
Isolated X-Ray-Infrared Sources in the Region of Interaction of the Supernova Remnant IC 443 with a Molecular Cloud
Bocchino, F.; Pavlov, G. G.; Bykov, A. M. +5 more
The nature of the extended hard X-ray source XMMU J061804.3+222732 and its surroundings is investigated using XMM-Newton, Chandra, and Spitzer observations. This source is located in an interaction region of the IC 443 supernova remnant with a neighboring molecular cloud. The X-ray emission consists of a number of bright clumps embedded in an exte…
Alfvén vortices in Saturn's magnetosheath: Cassini observations
Saur, J.; Alexandrova, O.
First signatures of Alfvén vortices in the Kronian magnetosheath are presented. An Alfvén vortex is a non-linear bi-dimensional magnetic structure associated with sheared magnetic field and velocity perturbations, propagating obliquely to the external magnetic field direction. Such structures have been recently discovered by Cluster in Earth's mag…
Scaling relations of the colour-detected cluster RzCS 052 at z = 1.016 and some other high-redshift clusters
Andreon, S.; Puddu, E.; Quintana, H. +2 more
We report on the discovery of the z = 1.016 cluster RzCS 052 using a modified red-sequence method, follow up spectroscopy and X-ray imaging. This cluster has a velocity dispersion of 710 +/- 150kms-1, a virial mass of 4.0 × 1014Msolar (based on 21 spectroscopically confirmed members) and an X-ray luminosity of (0.6…
Forward Modeling of Active Region Coronal Emissions. I. Methods and Testing
Lundquist, L. L.; Fisher, G. H.; McTiernan, J. M.
We present a method for simulating coronal emissions from solar active regions using observed photospheric magnetograms and an assumption about the coronal heating mechanism as input. The method invokes a "quasi-force-free" (minimized Lorentz force) coronal magnetic solution and a steady state energy balance model solved along field lines. Coronal…
The inverse Compton X-ray-emitting lobes of the high-redshift giant radio galaxy 6C0905+39
Fabian, A. C.; Erlund, M. C.; Blundell, Katherine M.
We present new XMM-Newton data of the high-redshift (z = 1.883), Mpc-sized giant radio galaxy 6C0905+39. The larger collecting area and longer observation time for our new data means that we can better characterize the extended X-ray emission, in particular its spectrum, which arises from cosmic microwave background photons scattered into the X-ra…