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The Unusual Galactic Center Radio Source N3
Morris, M. R.; Mills, E. A. C.; Mutel, R. +4 more
Here, we report on new multi-wavelength radio observations of the unusual point source “N3” that appears to be located in the vicinity of the Galactic Center (GC). VLA observations between 2 and 50 GHz reveal that N3 is a compact and bright source (56 mJy at 10 GHz) with a non-thermal spectrum superimposed upon the non-thermal radio filaments (NTF…
Testing the Effects of Expansion on Solar Wind Turbulence
Chen, Christopher H. K.; Vech, Daniel
We present a multi-spacecraft approach to test the predictions of recent studies on the effect of solar wind expansion on the radial spectral, variance, and local 3D anisotropies of the turbulence. We found that on small scales (5000-10,000 km) the power levels of the B-trace structure functions do not depend on the sampling direction with respect…
Preferred axis of CMB parity asymmetry in the masked maps
Cheng, Cheng; Huang, Qing-Guo; Santos, Larissa +1 more
Both WMAP and Planck data show a significant odd-multipole preference in the large scales of the cosmic microwave background (CMB) temperature anisotropies. If this pattern originates from cosmological effects, then it can be considered a crucial clue for a violation in the cosmological principle. By defining various direction dependent statistics…
Suzaku follow-up of heavily obscured active galactic nuclei detected in Swift/BAT survey: NGC 1106, UGC 03752, and NGC 2788A
Tanimoto, Atsushi; Ueda, Yoshihiro; Kawamuro, Taiki +1 more
We present the broad-band (0.5-100 keV) spectra of three heavily obscured active galactic nuclei (AGNs), NGC 1106, UGC 03752, and NGC 2788A, observed with Suzaku and the Swift/Burst Alert Telescope (BAT). The targets are selected from the Swift/BAT 70-month catalog on the basis of their high hardness ratio between above and below 10 keV, and their…
Tracking the energetics of the non-thermal disc-corona-jet in the very high state GX 339 - 4
Done, C.; Kubota, A.
The dramatic hard-soft spectral transition in black hole binaries is important as it is associated with the collapse of the jet and with the strongest low-frequency quasi-periodic oscillations (QPOs). These transition spectra (intermediate and very high state: VHS) are complex, with soft but distinctly non-thermal Comptonization which merges smoot…
Using radio stars to link the Gaia and VLBI reference frames
Malkin, Zinovy
A possible method for linking the optical Gaia Celestial Reference Frame (GCRF) to the VLBI-based International Celestial Reference Frame (ICRF) is to use radio stars in a manner similar to that in the linking of the Hipparcos Celestial Reference Frame (HCRF) to ICRF. In this work, an obtainable accuracy of the orientation angles between GCRF and …
Multi-spacecraft Analysis of Energetic Heavy Ion and Interplanetary Shock Properties in Energetic Storm Particle Events near 1 au
Jian, L. K.; Mason, G. M.; Desai, M. I. +3 more
We examine the longitude distribution of and relationship between interplanetary (IP) shock properties and ∼0.1-20 MeV nucleon-1 O and Fe ions during seven multi-spacecraft energetic storm particle (ESP) events at 1 au. These ESP events were observed at two spacecraft and were primarily associated with low Mach number, quasi-perpendicul…
Suzaku observations of the hard X-ray spectrum of Vela Jr. (SNR RX J0852.0-4622)
Katsuda, Satoru; Tashiro, Makoto S.; Terada, Yukikatsu +5 more
We report the results of Suzaku observations of the young supernova remnant, Vela Jr. (RX J0852.0-4622), which is known to emit synchrotron X-rays, as well as TeV gamma-rays. Utilizing 39 Suzaku mapping observation data from Vela Jr., a significant hard X-ray emission is detected with the hard X-ray detector (HXD) from the northwest TeV-emitting r…
Plasma observations during the Mars atmospheric "plume" event of March-April 2012
Gurnett, D. A.; Barabash, S.; Holmström, M. +10 more
We present initial analyses and conclusions from plasma observations made during the reported "Mars plume event" of March-April 2012. During this period, multiple independent amateur observers detected a localized, high-altitude "plume" over the Martian dawn terminator, the cause of which remains to be explained. The estimated brightness of the pl…
Polarimetry of comets 67P/Churyumov-Gerasimenko, 74P/Smirnova-Chernykh, and 152P/Helin-Lawrence
Jones, G. H.; Muinonen, K.; Protopapa, S. +5 more
Aims: Polarimetric characteristics of comets at large heliocentric distances is a relatively unexplored area; we extend the idea by adding and analysing the data for three Jupiter family comets (JFCs).
Methods: With the FORS2 instrument of the ESO VLT, we performed quasi-simultaneous photometry and polarimetry of three active JFCs 67P/Ch…