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Morphometry of volcanic cones on Mars in perspective of Astrobiological Research
Gilichinsky, Michael; Demidov, Nikita; Rivkina, Elizaveta
The permanently frozen volcanic sediment is one of the most promising geological objects for searching life on Mars. On Earth, volcanic intrusions into permafrost result in formation of the unique microbial communities. We propose several terrestrial analogues of Martian polar volcanoes, such as the permanently frozen volcanic sediments on the Kam…
The fundamental parameters of the Ap star 78 Virginis. Could 78 Vir be a rapidly oscillating Ap star?
Meilland, A.; Sturmann, J.; Sturmann, L. +11 more
Context. Determining the effective temperature of Ap stars, including the roAp stellar pulsators, is a difficult task owing to their strong magnetic field and their related spotted surfaces. It is, however, an important step towards constraining models of their complex atmosphere and testing proposed pulsation excitation mechanisms.
Aims: Usi…
Touchdown on Venus: Analytic wind models and a heuristic approach to estimating landing dispersions
Lorenz, Ralph D.
The 'landing ellipse' or region of uncertainty within which an unguided probe to Venus may be expected to land is calculated. The region can be usefully seen as the convolution of three different factors: an initial circular delivery uncertainty which is smeared at a grazing entry angle onto the planetary sphere, an along-track uncertainty due to …
Anomalous Microwave Emission in HII Regions: Is it Really Anomalous? The Case of RCW 49
Paladini, Roberta; Noriega-Crespo, Alberto; Agliozzo, Claudia +5 more
The detection of an excess of emission at microwave frequencies with respect to the predicted free-free emission has been reported for several Galactic H ii regions. Here, we investigate the case of RCW 49, for which the Cosmic Background Imager tentatively (∼3σ) detected Anomalous Microwave Emission (AME) at 31 GHz on angular scales of 7‧. Using …
Dynamics of Flare Processes and Variety of the Fine Structure of Solar Radio Emission over a Wide Frequency Range of 30 - 7000 MHz
Tan, Baolin; Tan, Chengming; Yan, Yihua +3 more
Radiobursts exhibiting fine structure observed over two years during the rising phase of Cycle 24 by the Chinese Solar Broadband Radio Spectrometer (SBRS/Huairou) in the range 1 - 7.6 GHz and the spectrograph IZMIRAN in the meter range (25 - 270 MHz) are analyzed. In five events the zebra structure, various fiber bursts, and fast pulsations were o…
Investigating the Nature of IGR J17454-2919 Using X-Ray and Near-infrared Observations
Greiner, J.; Nowak, M. A.; Chaty, S. +7 more
IGR J17454-2919 is a hard X-ray transient discovered by INTEGRAL on 2014 September 27. We report on our 20 ks Chandra observation of the source, performed about five weeks after the discovery, as well as on INTEGRAL and Swift long-term monitoring observations. X-ray broad-band spectra of the source are compatible with an absorbed power law, {{Γ }}…
Electron beam-associated symmetric electrostatic solitary waves on the separatrix of magnetic reconnection: multi-spacecraft analysis
Li, Shiyou; Zhang, Shifeng; Cai, Hong +1 more
We present an in situ evidence of electron beam-associated symmetric bipolar electrostatic solitary waves (ESWs) on the current sheet-side of the separatrix of the magnetic reconnection in the near-Earth magnetotail by multi-spacecraft observation of Cluster. Within one spin period, 42 cases of symmetric ESWs are continuously observed during 2 s b…
Visual binaries: cross-matching and compiling of a comprehensive list
Kovaleva, D. A.; Malkov, O. Yu.; Isaeva, A. A.
Visual binary stars make up the largest set among observed types of binaries (currently more than 110 000 systems are known containing more than 230 000 components). However, statistical analysis of this sample is a complicated task because a number of catalogues of visual binaries contain various data for evidently overlapping sets of objects. To…
Kathryn's Wheel: a spectacular galaxy collision discovered in the Galactic neighbourhood
Parker, Quentin A.; Stupar, Milorad; Frew, David J. +4 more
We report the discovery of the closest collisional ring galaxy to the Milky Way. Such rare systems occur due to `bulls-eye' encounters between two reasonably matched galaxies. The recessional velocity of about 840 km s-1 is low enough that it was detected in the Anglo-Australian Observatory/UK Schmidt Telescope Survey for Galactic H α e…
Coronal Mass Ejections from the Same Active Region Cluster: Two Different Perspectives
Mandrini, C. H.; Schmieder, B.; Cremades, H. +1 more
The cluster formed by active regions (ARs) NOAA 11121 and 11123, approximately located on the solar central meridian on 11 November 2010, is of great scientific interest. This complex was the site of violent flux emergence and the source of a series of Earth-directed events on the same day. The onset of the events was nearly simultaneously observe…