Search Publications
Unresolved X-ray emission in M31 and constraints on progenitors of classical novae
Bogdán, Á.; Gilfanov, M.
We investigate unresolved X-ray emission from M31 based on an extensive set of archival XMM-Newton and Chandra data. We show that extended emission, found previously in the bulge and thought to be associated with a large number of faint compact sources, extends to the disc of the galaxy with similar X-ray to K-band luminosity ratio. We also detect…
A new approach for estimating Titan's electron conductivity based on data from relaxation probe sensors on the Huygens experiment
Rodrigo, R.; Fulchignoni, M.; Ferri, F. +15 more
The Huygens Probe measured the electrical conductivity of Titan atmosphere from about 140 km down to the surface, employing relaxation and mutual impedance techniques. Previous analyses have shown some differences on the conductivity measurements obtained with two independent sensors - relaxation probe (RP) and mutual impedance probe (MIP). A 20-f…
Oxygen ion energization observed at high altitudes
Gunell, H.; Waara, M.; Nilsson, H. +3 more
We present a case study of significant heating (up to 8 keV) perpendicular to the geomagnetic field of outflowing oxygen ions at high altitude (12 RE) above the polar cap. The shape of the distribution functions indicates that most of the heating occurs locally (within 0.2-0.4 RE in altitude). This is a clear example of local…
Statistical study of EUV and X-ray transient brightenings
Li, Hui; Li, Jing-Wei
Using the visual inspection and base difference method and data from the X-ray Telescope (XRT) onboard Hinode and TRACE with improved spatial and temporal resolution, we selected 48 X-ray transient brightenings (XTBs) and 237 EUV transient brightenings (ETBs) to study the connection between these two types of transient brightenings (TBs). These ET…
The interior of the Sun in 3-D: Beyond the spherical Sun picture
Mathis, S.
With all the results now obtained by global helioseismology, it is clear that we have to go beyond the classical spherical modelling of the Sun. In this way, it is now necessary to draw a picture that takes into account internal dynamical processes such as rotation, magnetic field, and waves from the core to the surface. This is a challenging task…
First Orbit Solutions and Calculated Masses of 10 Visual Binaries
Ling, J. F.
This paper presents the first reported orbits and masses of 10 visual double stars, all of which have described arcs of less than 180° since the first observation: WDS 00209+1059 (BU 1093), WDS 02405 - 2408 (SEE 19), WDS 05289 - 0318 (DA 6), WDS 07347+3852 (HU 842 AB), WDS 07546 - 0248 (STF 1157), WDS 08127+2613 (A 2471), WDS 08456+8442 (A 1078), …
Observing Exoplanets with SOFIA
Krabbe, A.; Angerhausen, D.; Iserlohe, C.
In this article we present an analysis of possible science cases for NASA’s Stratospheric Observatory for Infrared Astronomy (SOFIA) in the field of extrasolar planet detection and characterization. Advantages of SOFIA and its instruments for exoplanet observations are illustrated and possible targets are introduced. Possible future instrumentatio…
The Non-radial Propagation of Coronal Streamers within a Solar Cycle
Tlatov, A. G.
We have analyzed the shape of the solar corona using the data of daily observations with Mark-III/IV (1980-2008) and SOHO/LASCO-2 (1996-2009) telescopes. The angles of deviation of coronal rays from the radial direction Δθ vary cyclically, reaching the maximum deviation toward the solar equator at the minimum of the solar activity. We consider the…
The Abundance Pattern of O, Ne, Mg, and Fe in the Interstellar Medium of S0 Galaxy NGC 4382 Observed with Suzaku
Matsushita, Kyoko; Nagino, Ryo
We derived the O, Ne, Mg, and Fe abundances in the interstellar medium (ISM) of a relatively isolated S0 galaxy, NGC 4382, observed with the Suzaku XIS instruments, and compared the O/Ne/Mg/Fe abundance pattern with that of the ISM in elliptical galaxies. The derived temperature and Fe abundance in the ISM are ∼ 0.3 keV and 0.6-2.9 solar, respecti…
Modulation Mechanism of Tev, Gev, and X-ray Emission in LS5039
Yamaguchi, M. S.; Takahara, F.
The emission mechanism of the gamma-ray binary LS5039 in TeV, GeV, and X-ray energy bands is investigated. Observed light curves in LS5039 show that TeV and GeV fluxes anticorrelate, whereas TeV and X-ray fluxes correlate. However, such correlated variations have not yet been reasonably explained at this stage. Assuming that relativistic electrons…