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Titan's Upper Atmosphere from Cassini/UVIS Solar Occultations
Koskinen, Tommi T.; Yelle, Roger V.; Capalbo, Fernando J. +1 more
Titan’s atmosphere is composed mainly of molecular nitrogen, methane being the principal trace gas. From the analysis of 8 solar occultations measured by the Extreme Ultraviolet channel of the Ultraviolet Imaging Spectrograph (UVIS) on board Cassini, we derived vertical profiles of N2 in the range 1100-1600 km and vertical profiles of C…
On the in-flight calibration plans of modern x-ray observatories
Petre, Robert; Guainazzi, Matteo; Audard, Marc +5 more
We present an overview of the set of celestial sources used for in-flight calibration of x-ray detectors by past and operational missions. We show the rationale behind their choice as a guideline for future missions aiming at optimizing the critical early phases of their science operations.
Formation of Pores Associated with the Inflow of Moving Magnetic Features
Zhang, Hongqi; Yang, Zhiliang; Li, Xiaobo
We investigate the formation of pores in NOAA AR 10930 associated with the inflow of moving magnetic features (MMFs) using simultaneous Hinode/Solar Optical Telescope filtergrams and magnetograms. The main results are outlined as follows: (1) the existence of MMFs around pores is a fairly common phenomenon. Around the four innate and one residue p…
Period change of massive binaries from combined photometric and spectroscopic data in Cygnus OB2
Tuvikene, Taavi; Tempel, Elmo; Eenmäe, Tõnis +2 more
Context. Mass loss is an important property in evolution models of massive stars. As up to 90% of the massive stars have a visual or spectroscopic companion and many of them exhibit mass exchange, mass-loss rates can be acquired through studying the period of massive binaries.
Aims: Using our own photometric observations as well as archival d…
Investigating early-type galaxy evolution with a multiwavelength approach - I. X-ray properties of 12 galaxies observed with Swift and XMM-Newton
Wolter, A.; Marino, A.; Trinchieri, G. +2 more
We report here the results from the X-ray observations of 12 early-type galaxies (ETGs) observed with Swift and XMM-Newton, originally selected from a sample of galaxies with Spitzer and/or GALEX data. With the combined analysis of new X-ray and optical-UV observations and of previously available data from archives, we aim at investigating the rel…
Electron density and parallel electric field distribution of the auroral density cavity
Karlsson, T.; Marklund, G. T.; Alm, L.
We present an event study in which Cluster satellites C1 and C3 encounters the flux tube of a stable auroral arc in the premidnight sector. C1 observes the midcavity, while C3 enters the flux tube of the auroral arc at an altitude which is below the acceleration region, before crossing into the top half of the acceleration region. This allows us t…
Mapping Mars: Geodetic and cartographic aspects
Statella, Thiago
This paper presents a review of geodetic and cartographic aspects involved in the mapping of Mars and in the handling of planetary data returned and available from different team missions. It focuses on the reference system adopted for the planet, the main coordinate systems being used and main projection systems adopted when representing the data…
Indian Mars-Colour-Camera captures far-side of the Deimos: A rarity among contemporary Mars orbiters
Chauhan, Prakash; Arya, A. S.; Manthira Moorthi, S. +10 more
Mars and Deimos are tidally locked so one would always get to view the same side of Deimos from Mars. Most of the contemporary functional satellites orbiting Mars viz. Mars Reconnaissance Orbiter , Mars Express, Mars Odyssey, MAVEN etc. are positioned between Mars and Deimos, hence they always view only one side of Deimos i.e the Mars-side, while …
G305.136+0.068: A Massive and Dense Cold Core in an Early Stage of Evolution
Pineda, Jaime E.; Garay, Guido; Mardones, Diego +3 more
We report molecular line observations, made with ASTE and SEST, and dust continuum observations at 0.87 mm, made with APEX, toward the cold dust core G305.136+0.068. The molecular observations show that the core is isolated and roughly circularly symmetric and imply that it has a mass of 1.1 × 103 M ⊙. A simultaneous model fi…
X-rays from the episodic dust maker WR 137
Zhekov, Svetozar A.
We present an analysis of the XMM-Newton observation of the episodic dust maker WR 137. Global spectral fits show that its X-ray spectrum is well matched by a two-temperature optically-thin plasma emission (kT1 ∼ 0.4 keV and kT2 ∼ 2.2 keV). If we adopt the colliding stellar wind (CSW) picture for this wide WR+O binary, the th…