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A Decameter Stationary Type IV Burst in Imaging Observations on 2014 September 6
Koval, Artem; Stanislavsky, Aleksander; Chen, Yao +3 more
First-of-its-kind radio imaging of a decameter solar stationary type IV radio burst has been presented in this paper. On 2014 September 6 the observations of type IV burst radio emission were carried out with the two-dimensional heliograph based on the Ukrainian T-shaped radio telescope (UTR-2), together with other telescope arrays. Starting at ∼0…
Ion Bernstein waves in the magnetic reconnection region
Glassmeier, K. -H.; Nakamura, R.; Baumjohann, W. +3 more
Four-dimensional energy spectra and a diagram for dispersion relations are determined for the first time in a magnetic reconnection region in the magnetotail using data from four-spacecraft measurements by the Cluster mission on a spatial scale of 200 km, about 0.1 ion inertial lengths. The energy spectra are anisotropic with an extension in the p…
Cluster observations of non-time continuous magnetosonic waves
Boardsen, Scott A.; Sibeck, David G.; Walker, Simon N. +3 more
Equatorial magnetosonic waves are normally observed as temporally continuous sets of emissions lasting from minutes to hours. Recent observations, however, have shown that this is not always the case. Using Cluster data, this study identifies two distinct forms of these non-temporally continuous emissions. The first, referred to as rising tone emi…
Multi-wavelength Study of HESS J1741-302
Kargaltsev, Oleg; Sonbas, Eda; Hare, Jeremy +2 more
We present the results of two Chandra X-ray Observatory (CXO) observations of TeV γ-ray source HESS J1741-302. We investigate whether there is any connection between HESS J1741-302 and the sources seen at lower energies. One of the brightest X-ray sources in the HESS J1741-302 field, CXOU J174112.1-302908, appears to be associated with a low-mass …
Improved orbits and parallaxes for eight visual binaries with unrealistic previous masses using the Hipparcos parallax
Docobo, J. A.; Malkov, O. Yu.; Tamazian, V. S. +2 more
Improved orbits are presented for the visual binaries WDS 02366+1227, WDS 02434-6643, WDS 03244-1539, WDS 08507+1800, WDS 09128-6055, WDS 11532-1540, WDS 17375+2419, and WDS 22408-0333. The latest orbits for these binaries were demonstrating a great inconsistency between the systemic mass obtained through Kepler's Third Law and that calculated as …
Observation of Neon at mid and high latitudes in the sunlit lunar exosphere: Results from CHACE aboard MIP/Chandrayaan-1
Bhardwaj, Anil; Sridharan, R.; Thampi, Smitha V. +2 more
The distribution of neutral Neon at the mid and high latitudes in the sunlit lunar exosphere observed by CHandra's Altitudinal Composition Explorer (CHACE) aboard the Moon Impact Probe (MIP) of the Chandrayaan-1 is reported. The CHACE observation was made when Moon was in the Earth's magnetotail. The upper limits of the surface number density are …
The warm absorber in the radio-loud quasar 4C +74.26
Costantini, E.; Di Gesu, L.
Outflows of photoionized gas are commonly detected in the X-ray spectra of Seyfert 1 galaxies. However, the evidence for this phenomenon in broad line radio galaxies, which are analogous to Seyfert 1 galaxies in the radio-loud regime, has so far been scarce. Here, we present the analysis of the X-ray absorption in the radio-loud quasar 4C +74.26. …
A far-ultraviolet variable with an 18-minute period in the globular cluster NGC 1851
Maccarone, T. J.; Knigge, C.; Sarajedini, A. +5 more
We present the detection of a variable star with an 18.05 min period in far-ultraviolet (FUV) images of the globular cluster NGC 1851 taken with the Hubble Space Telescope (HST). A candidate optical counterpart lies on the red horizontal branch or the asymptotic giant branch star of the cluster, but it is statistically possible that this is a chan…
Disk galaxy scaling relations at intermediate redshifts. I. The Tully-Fisher and velocity-size relations
Böhm, Asmus; Ziegler, Bodo L.
Aims: Galaxy scaling relations such as the Tully-Fisher relation (between the maximum rotation velocity Vmax and luminosity) and the velocity-size relation (between Vmax and the disk scale length) are powerful tools to quantify the evolution of disk galaxies with cosmic time.
Methods: We took spatially resolved slit…
Analysis of crater valleys, Noachis Terra, Mars: Evidence of fluvial and glacial processes
Hobbs, S. W.; Paull, D. J.; Clarke, J. D. A.
The precise mechanism for the formation and evolution of crater valley networks in the Martian southern highlands remains under debate, with precipitation, groundwater flow, and melting induced by impact being suggested. We studied valley networks within four craters of the Noachis Terra highlands that were representative of similar features in No…