Search Publications
Modeling of the electromagnetic ion cyclotron wave generation in the H+-He+ plasma of the inner magnetosphere
Lubchich, Andris A.; Semenova, Nadezhda V.
Behaviors of the integrated wave gain of electromagnetic ion cyclotron (EMIC) waves in the H+-He+ plasma of the inner magnetosphere is investigated. The integrated wave gain is obtained by integration of a temporal local growth rate along a geomagnetic field line. The local growth rate is determined by the method of Kennel an…
Young star clusters in the interacting galaxies of Hickson Compact Group 90
Sharples, R. M.; Cho, J.; Miah, J. A.
Deep images of Hickson Compact Group 90 (HCG 90) have been obtained using the Advanced Camera for Surveys on the Hubble Space Telescope. We report results for star clusters observed in the interacting pair of galaxies NGC 7174 and NGC 7176. We present magnitude and colour distributions for the observed cluster population and find that the majority…
Improved Views of the Moon in the Early Twenty First Century: A Review
Yang, Hongwei; Zhao, Wenjin
The twenty first century was an exciting epoch in planetary exploration, when a large number of lunar scientific achievements were accomplished. New missions in the first decade of the twenty first century have herald a new and exciting phase in lunar exploration, including LRO, LCROSS, the dual GRAIL orbiters, Kaguya, Chandrayaan 1, and the Chang…
Adaptation of the de Hoffmann-Teller frame for quasi-perpendicular collisionless shocks
Narita, Y.; Motschmann, U.; Comişel, H.
The concept of the de Hoffmann-Teller frame is revisited for a high Mach-number quasi-perpendicular collisionless shock wave. Particle-in-cell simulation shows that the local magnetic field oscillations in the shock layer introduce a residual motional electric field in the de Hoffmann-Teller frame, which is misleading in that one may interpret tha…
LMC S63: a historical reappraisal of the outburst behaviour of a deeply eclipsing Magellanic symbiotic star
Gromadzki, Mariusz; Miszalski, Brent; Iłkiewicz, Krystian +2 more
We present an analysis of multi-epoch low-resolution spectrophotometry, complemented by the light curves provided by massive photometric surveys spanning over 100 yr, of the symbiotic binary LMC S63. We showed that it is an eclipsing binary with the orbital period of 1050 d. We also found evidence of outbursts in history of the white dwarf. If it …
High-latitude, Transluscent Molecular Clouds as Probes of Local Cosmic Rays
Abrahams, Ryan D.; Paglione, Timothy A. D.
We analyze the gamma ray emission from nine high latitude, translucent molecular clouds taken with the Fermi Large Area Telescope between 250 MeV and 10 GeV. Observations of gamma rays allow us to probe the density and spectrum of cosmic rays in the solar neighborhood. The clouds studied lie within ∼270 pc from the Sun and are selected from the Pl…
Spectral properties of the soft excess pulsar RX J0059.2-7138 during its 2013 outburst
Tiengo, A.; Mereghetti, S.; Sidoli, L. +2 more
We report on an X-ray observation of the Be X-ray binary pulsar RX J0059.2-7138, performed by XMM-Newton in 2014 March. The 19 ks long observation was carried out about three months after the discovery of the latest outburst from this Small Magellanic Cloud transient, when the source luminosity was LX ∼1038 erg s-1…
Magnetic phase structure of Saturn's 10.7 h oscillations
Dougherty, M. K.; Yates, J. N.; Southwood, D. J.
A source of Saturn's magnetic 10.7 h period oscillations has yet to be identified. The oscillations are known to consist of signals with slightly different periods from separate northern and southern sources. Here we present a novel way of examining observations, focusing on signal phase. We show that although the signals are highly periodic they …
Estimating Galactic gas content using different tracers: Compatibility of results, dark gas, and unidentified TeV sources
Torres, Diego F.; de Oña Wilhelmi, Emma; Natale, Giovanni +1 more
A large fraction of Galactic very-high energy (VHE; E ≳ 100 GeV) γ-ray sources is cataloged as unidentified. In this work we explore the possibility that these unidentified sources are located in environment particularly rich in material content unaccounted by traditional tracers. In a scenario where the VHE emission is due to the interaction of t…
Inertial Range Turbulence of Fast and Slow Solar Wind at 0.72 AU and Solar Minimum
Bruno, Roberto; Zhang, Tielong; Echim, Marius +3 more
We investigate Venus Express observations of magnetic field fluctuations performed systematically in the solar wind at 0.72 Astronomical Units (AU), between 2007 and 2009, during the deep minimum of solar cycle 24. The power spectral densities (PSDs) of the magnetic field components have been computed for time intervals that satisfy the data integ…