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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…
Understanding the X-ray spectrum of anomalous X-ray pulsars and soft gamma-ray repeaters
Liu, Yuan; Guo, Yan-Jun; Tong, Hao +3 more
Hard X-rays above 10 keV are detected from several anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs), and different models have been proposed to explain the physical origin within the frame of either a magnetar model or a fallback disk system. Using data from Suzaku and INTEGRAL, we study the soft and hard X-ray spectra of four AX…
Detection of Extremely Broad Water Emission from the Molecular Cloud Interacting Supernova Remnant G349.7+0.2
Rho, J.; Hewitt, J. W.; Boogert, A. +2 more
We performed Herschel HIFI, PACS, and SPIRE observations toward the molecular cloud interacting supernova remnant G349.7+0.2. An extremely broad emission line was detected at 557 GHz from the ground state transition 110-101 of ortho-water. This water line can be separated into three velocity components with widths of 144, 27,…
Spicules Intensity Oscillations in SOT/HINODE Observations
Ahangarzadeh Maralani, A. R.; Tavabi, E.; Ajabshirizadeh, A. +1 more
We study the coherency of solar spicules intensity oscillations with increasing height above the solar limb in quiet Sun, active Sun and active region using observations from HINODE/SOT. Existence of coherency up to transition region strengthens the theory of the coronal heating and solar wind, through energy transport and photospheric oscillation…
Not a galaxy: IRAS 04186+5143, a new young stellar cluster in the outer Galaxy
Elia, Davide; Molinari, S.; Torrelles, J. M. +2 more
We report the discovery of a new young stellar cluster in the outer Galaxy located at the position of an IRAS Point Source Catalog source that has been previously misidentified as an external galaxy. The cluster is seen in our near-infrared imaging towards IRAS 04186+5143 and in archive Spitzer images confirming the young stellar nature of the sou…
High angular resolution stellar imaging with occultations from the Cassini spacecraft - II. Kronocyclic tomography
Nicholson, Philip D.; Hedman, Matthew M.; Lloyd, James P. +2 more
We present an advance in the use of Cassini observations of stellar occultations by the rings of Saturn for stellar studies. Stewart et al. demonstrated the potential use of such observations for measuring stellar angular diameters. Here, we use these same observations, and tomographic imaging reconstruction techniques, to produce two-dimensional …
Forecasting SEP events with same active region prior flares
White, S. M.; Kahler, S. W.; Ling, A.
Forecasting large solar energetic (E > 10 MeV) particle (SEP) events is currently based on observed solar X-ray flare peak fluxes or fluences. Recent work has indicated that the probability of a solar eruptive event in an active region (AR) is enhanced when a large flare has occurred in that AR during the previous day. In addition, peak intensi…
The dependence of the AV prior for SN Ia on host mass and disc inclination
Holwerda, B. W.; Keel, W. C.; Kenworthy, M. A. +1 more
Type Ia supernovae (SNe Ia) are used as `standard candles' for cosmological distance scales. To fit their light-curve shape-absolute luminosity relation, one needs to assume an intrinsic colour and a likelihood of host galaxy extinction or a convolution of these, a colour distribution prior. The host galaxy extinction prior is typically assumed to…