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Intervals of Radial Interplanetary Magnetic Fields at 1 AU, Their Association with Rarefaction Regions, and Their Apparent Magnetic Foot Points at the Sun
Zurbuchen, Thomas H.; Schwadron, Nathan A.; Smith, Charles W. +4 more
We have examined 226 intervals of nearly radial interplanetary magnetic field orientations at 1 AU lasting in excess of 6 hr. They are found within rarefaction regions as are the previously reported high-latitude observations. We show that these rarefactions typically do not involve high-speed wind such as that seen by Ulysses at high latitudes du…
An X-Ray Counterpart of HESS J1427-608 Discovered with Suzaku
Dotani, Tadayasu; Terada, Yukikatsu; Matsumoto, Hironori +9 more
We report on the discovery of an X-ray counterpart of the unidentified very high-energy gamma-ray source HESS J1427-608. In the sky field coincident with HESS J1427-608, an extended source was found in the 2-8 keV band, and was designated as Suzaku J1427-6051. Its X-ray radial profile has an extension of σ = 0.'9 ± 0.'1 if approximated by a Gaussi…
Hα Moreton waves observed on December 06, 2006. A 2D case study
Luoni, M. L.; Costa, A.; Francile, C. +1 more
Context. We present high temporal resolution observations of a Moreton wave event detected with the Hα Solar Telescope for Argentina (HASTA) in the Hα line 656.3 nm, on December 6, 2006.
Aims: The aim is to contribute to the discussion about the nature and triggering mechanisms of Moreton wave events.
Methods: We describe the HASTA teles…
Variable dust formation by the colliding-wind Wolf-Rayet system HD 36402 in the Large Magellanic Cloud
Gruendl, R. A.; Chu, Y. -H.; Guerrero, M. A. +1 more
Infrared photometry of the probable triple WC4(+O?)+O8I: Wolf-Rayet system HD 36402 (= BAT99-38) in the Large Magellanic Cloud shows emission characteristic of heated dust. The dust emission is variable on a time-scale of years, with a period near 4.7 yr, possibly associated with orbital motion of the O8 supergiant and the inner P ≃ 3.03-d WC4+O b…
Two Power-Law States of the Ultraluminous X-Ray Source IC 342 X-1
Isobe, Naoki; Kubota, Aya; Mineshige, Shin +3 more
In order to elucidate the emission properties of ultraluminous X-ray sources (ULXs) during their power-law (PL) state, we examined long-term X-ray spectral data of IC 342 X-1 during its PL state by using our own Suzaku data and archival data by XMM-Newton, Chandra, and Swift observations. The PL state of this source seems to be classified into two…
Remote sensing of the energy of auroral electrons in Saturn’s atmosphere: Hubble and Cassini spectral observations
Bonfond, B.; Nichols, J. D.; Clarke, J. T. +6 more
Saturn’s north ultraviolet aurora has been successfully observed twice between March and May 2011 with the STIS long-slit spectrograph on board the Hubble Space Telescope. Spatially resolved spectra at ∼12 Å spectral resolution have been collected at different local times from dawn to dusk to determine the amount of hydrocarbon absorption. For thi…
Herschel/HIFI Observations of a New Interstellar Water Maser: The 532-441 Transition at 620.701 GHz
Menten, Karl M.; Tolls, Volker; Neufeld, David A. +4 more
Using the Herschel Space Observatory's Heterodyne Instrument for the Far-Infrared, we have performed mapping observations of the 620.701 GHz 532-441 transition of ortho-H2O within a ~1.'5 × 1.'5 region encompassing the Kleinmann-Low nebula in Orion (Orion-KL), and pointed observations of that transition toward the …
On the Galactic Center being the main source of galactic cosmic rays as evidenced by recent cosmic ray and gamma ray observations
Yuan, Qiang; Liu, Cheng; Hu, Hong-Bo +2 more
We revisit the idea that the Galactic Center (GC) is the dominant source of galactic cosmic rays (GCRs), based on a series of new observational evidence. A unified model is proposed to explain the new phenomena of GCRs and γ-rays simultaneously. The GCRs are thought to be accelerated during past activities of the GC. The pair production process of…
XMM-Newton Observation of the α Persei Cluster
Wolk, Scott J.; Pillitteri, Ignazio; Remage Evans, Nancy +1 more
We report on the analysis of an archival observation of part of the α Persei cluster obtained with XMM-Newton. We detected 102 X-ray sources in the band 0.3-8.0 keV, of which 39 of them are associated with the cluster as evidenced by appropriate magnitudes and colors from Two Micron All Sky Survey photometry. We extend the X-ray luminosity distrib…
The Burst Cluster: Dark Matter in a Cluster Merger Associated with the Short Gamma-Ray Burst, GRB 050509B
Dahle, H.; Kouveliotou, C.; Wijers, R. A. M. J. +11 more
We have identified a merging galaxy cluster with evidence of two distinct subclusters. The X-ray and optical data suggest that the subclusters are presently moving away from each other after closest approach. This cluster merger was discovered from observations of the first well-localized short-duration gamma-ray burst (GRB), GRB 050509B. The Swif…