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Peculiarities of the accretion flow in the system HL CMa
Lutovinov, A. A.; Revnivtsev, M. G.; Semena, A. N. +2 more
The properties of the aperiodic luminosity variability for the dwarf novaHLCMa are considered. The variability of the system HL CMa is shown to be suppressed at frequencies above 0.7 × 10-2 Hz. Different variability suppression mechanisms related to the radiation reprocessing time, partial disk evaporation, and characteristic variabilit…
Variability of the nitric oxide nightglow at Venus during solar minimum
Montmessin, F.; Marcq, E.; Royer, E. M.
We present results from a NO airglow inversion method based on Venus Express data acquired from 2006 to 2010, during the last solar minimum period. We retrieve an altitude of 114 ± 10 km for the emission peak of the NO layer, with an associated scale height of 20 ± 10 km and an average limb brightness of 59.3 kR with a standard deviation of 63 kR.…
The Global Implications of the Hard Excess. II. Analysis of the Local Population of Radio-quiet AGNs
Turner, T. J.; Reeves, J. N.; Gofford, J. +5 more
Active galactic nuclei (AGNs) show evidence for reprocessing gas, outflowing from the accreting black hole. The combined effects of absorption and scattering from the circumnuclear material likely explain the “hard excess” of X-ray emission above 20 keV, compared with the extrapolation of spectra from lower X-ray energies. In a recent Suzaku study…
Penetration of magnetosheath plasma into dayside magnetosphere: 2. Magnetic field in plasma filaments
Goldstein, Melvyn L.; Pollock, Craig; Lyatsky, Wladislaw +2 more
In this paper, we examined plasma structures (filaments), observed in the dayside magnetosphere but containing magnetosheath plasma. These filaments show the stable antisunward motion (while the ambient magnetospheric plasma moved in the opposite direction) and the existence of a strip of magnetospheric plasma, separating these filaments from the …
AGB stars in Leo P and their use as metallicity probes
Lee, Chien-Hsiu
Leo P is the most metal-poor yet star-forming galaxy in the local volume, and has the potential to serve as a local counterpart to interpret the properties of distant galaxies in the early universe. We present a comprehensive search of asymptotic giant branch (AGB) stars in Leo P using deep infrared imaging. AGB stars are the major dust contributo…
Development of a formalism for computing transits of Earth-directed CMEs, plasma sheaths, and shocks. Towards a forecasting tool
Corona-Romero, P.; Gonzalez-Esparza, J. A.
Interplanetary Coronal mass ejections (ICMEs) (super-magnetosonically) faster than the ambient solar wind are preceded by shock waves. Earth-directed shock waves, plasma sheaths and ICMEs are precursors of the major geomagnetic storms. The plasma sheath between the shock and the ICME leading edge plays a very important role to determine the geoeff…
The Gaia Attitude Star Catalog
Smart, R. L.
We describe the Attitude Star Catalog produced for the Gaia mission. This catalog is being used by Gaia for the first on-ground attitude reconstruction. Originally it was simply a subset of the Initial Gaia Source List but this subset did not meet the isolation requirements and it contained a significant number of double entries. As a result durin…
A new characterization of the Compton process in the ULX spectra
Makishima, K.; Kobayashi, S.; Nakazawa, K.
Attempts were made to construct a unified description of the spectra of ULX (Ultra Luminous X-ray source) objects, including their power-law (PL) state and disk-like state. Among spectral models proposed to explain either state, the present work adopts the one which combines multi-color disk (MCD) emission and its thermal Comptonization (THC). Thi…
The nature of the cataclysmic variable PT Per
Watson, M. G.; Osborne, J. P.; Schwope, A. D. +2 more
We present a study of the cataclysmic variable star PT Per based on archival XMM-Newton X-ray data and new optical spectroscopy from the William Herschel Telescope (WHT) with Intermediate dispersion Spectrograph and Imaging System (ISIS). The X-ray data show deep minima which recur at a period of 82 min and a hard, unabsorbed X-ray spectrum. The o…
A Possible Cause of the Diminished Solar Wind During the Solar Cycle 23 - 24 Minimum
Wu, Chin-Chun; Liou, Kan
Interplanetary magnetic field and solar wind plasma density observed at 1 AU during Solar Cycle 23 - 24 (SC-23/24) minimum were significantly smaller than those during its previous solar cycle (SC-22/23) minimum. Because the Earth's orbit is embedded in the slow wind during solar minimum, changes in the geometry and/or content of the slow wind reg…