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The morphology of Saturn's ultraviolet aurora
Carbary, J. F.
Spectrographic images in the far ultraviolet, obtained from observations made from 2007 to 2009, are used to quantify and compare the morphology of Saturn's northern and southern aurora in local time. Made by the UVIS imager on the Cassini spacecraft, these observations differ from previous UV observations of Saturn's aurora by offering complete l…
BeppoSAX Observations of the X-Ray Pulsar MAXI J1409-619 in Low State: Discovery of Cyclotron Resonance Features
Sidoli, Lara; Masetti, Nicola; Frontera, Filippo +2 more
The transient 500 s X-ray pulsar MAXI J1409-619 was discovered by the slit cameras aboard Monitor of All-sky X-ray Image (MAXI) on 2010 October 17, and soon after accurately localized by Swift. We found that the source position was serendipitously observed in 2000 during BeppoSAX observations of the Galactic plane. Two sources are clearly detected…
Detection of exospheric O2+ at Saturn's moon Dione
Coates, A. J.; Thomsen, M. F.; Wilson, R. J. +6 more
During a close pass of Cassini through the plasma wake of Saturn's moon Dione on April 7, 2010 the Cassini Plasma Spectrometer (CAPS) detected molecular oxygen ions (O2+) on pick up ring velocity distributions, thus providing the first in situ detection of a neutral exosphere surrounding the icy moon. The density of O2
The magnetized medium around the radio galaxy B2 0755+37: an interaction with the intragroup gas
Guidetti, D.; Croston, J. H.; Parma, P. +2 more
We explore the magnetoionic environment of the isolated radio galaxy B2 0755+37 using detailed imaging of the distributions of Faraday rotation and depolarization over the radio source from Very Large Array observations at 1385, 1465 and 4860 MHz and new X-ray data from XMM-Newton. The rotation measure (RM) distribution is complex, with evidence f…
The Nature of Starbursts. III. The Spatial Distribution of Star Formation
McQuinn, Kristen B. W.; Cannon, John M.; Dolphin, Andrew E. +5 more
We map the spatial distribution of recent star formation over a few × 100 Myr timescales in 15 starburst dwarf galaxies using the location of young blue helium burning stars identified from optically resolved stellar populations in archival Hubble Space Telescope observations. By comparing the star formation histories from both the high surface br…
Magnetic Field Strength in the Upper Solar Corona Using White-light Shock Structures Surrounding Coronal Mass Ejections
Cho, K. -S.; Moon, Y. -J.; Gopalswamy, N. +2 more
To measure the magnetic field strength in the solar corona, we examined 10 fast (>=1000 km s-1) limb coronal mass ejections(CMEs) that show clear shock structures in Solar and Heliospheric Observatory/Large Angle and Spectrometric Coronagraph images. By applying the piston-shock relationship to the observed CME's standoff distance an…
Fermi-LAT Observations and a Broadband Study of Supernova Remnant CTB 109
Slane, Patrick; Castro, Daniel; Ellison, Donald C. +1 more
CTB 109 (G109.1-1.0) is a Galactic supernova remnant (SNR) with a hemispherical shell morphology in X-rays and in the radio band. In this work, we report the detection of γ-ray emission coincident with CTB 109, using 37 months of data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. We study the broadband characteristics…
Survival of flux transfer event (FTE) flux ropes far along the tail magnetopause
Eastwood, J. P.; Fear, R. C.; Phan, T. D. +4 more
During intervals of southward IMF, magnetic reconnection can result in the formation of flux transfer events (FTEs) on the dayside magnetopause which travel along the magnetopause in the anti-sunward direction. Of particular interest is their fate and the role they play transporting solar wind plasma into the magnetosphere. We present the discover…
Nonstorm time scattering of ring current protons by electromagnetic ion cyclotron waves
Xiao, Fuliang; Yang, Chang; Zhou, Qinghua +4 more
We report correlated observation of enhanced electromagnetic ion cyclotron (EMIC) waves and dynamic evolution of ring current proton flux collected by Cluster satellite near the location L = 4.5 during March 26-27, 2003, a nonstorm period (Dst> -10). Energetic (5-30 keV) proton fluxes are found to drop rapidly (e.g., a half hour) at …
The radio-X-ray relation as a star formation indicator: results from the Very Large Array-Extended Chandra Deep Field-South
Brandt, W. N.; Tozzi, P.; Xue, Y. Q. +10 more
In order to trace the instantaneous star formation rate (SFR) at high redshift, and thus help in understanding the relation between the different emission mechanisms related to star formation, we combine the recent 4-Ms Chandra X-ray data and the deep Very Large Array radio data in the Extended Chandra Deep Field-South region. We find 268 sources …