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Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +55 more
Context. The camera OSIRIS on board Rosetta obtained high-resolution images of the nucleus of comet 67P/Churyumov-Gerasimenko (67P). Great parts of the nucleus surface are composed of fractured terrain.
Aims: Fracture formation, evolution, and their potential relationship to physical processes that drive activity are not yet fully understood.…
A Systematic Study of the Thermal and Nonthermal Emission in the Supernova Remnant RCW 86 with Suzaku
Katsuda, Satoru; Vink, Jacco; Bamba, Aya +2 more
Diffusive shock acceleration by the shockwaves in supernova remnants (SNRs) is widely accepted as the dominant source for Galactic cosmic rays. However, it is unknown what determines the maximum energy of accelerated particles. The surrounding environment could be one of the key parameters. The SNR RCW 86 shows both thermal and nonthermal X-ray em…
Geologic analysis of the Rosetta NavCam, Osiris and ROLIS images of the comet 67P/Churyumov-Gerasimenko nucleus
Keller, H. U.; Mottola, S.; Hviid, S. F. +5 more
This paper is based on geologic analysis of the surface morphology of nucleus of the Jupiter family comet 67P. This comet was visited by the ESA mission Rosetta, which escorted the comet since May 2014 till the end of September 2016 and studied it by 11 instruments of the mission orbiter and 10 instruments of the lander. The nucleus is 4 km in dia…
Optical and UV Spectra of the Remnant of SN 1885 (S And) in M31
Fesen, Robert A.; Hamilton, Andrew J. S.; Weil, Kathryn E. +1 more
We present multi-slit, 1D and 2D optical and UV spectra of the remnant of supernova 1885 (SN 1885; S And) taken using the Hubble Space Telescope’s Imaging Spectrograph (HST/STIS). These spectra of this probable subluminous Type Ia remnant, seen in silhouette against the central bulge of the Andromeda galaxy (M31), show strong and broad absorptions…
Deriving physical parameters of unresolved star clusters. V. M 31 PHAT star clusters
Vansevičius, V.; Stonkutė, R.; de Meulenaer, P.
Context. This study is the fifth of a series that investigates the degeneracy and stochasticity problems present in the determination of physical parameters such as age, mass, extinction, and metallicity of partially resolved or unresolved star cluster populations in external galaxies when using HST broad-band photometry.
Aims: In this work w…
Catalogue of Coordinates and B-Magnitudes in -20° - +2° Zone Based on the Ulugh Beg Astronomical Institute Part of the Fon Project
Ehgamberdiev, Sh. A.; Andruk, V. M.; Muminov, M. M. +5 more
Catalogue of 13.4 million stars down to 17.5m was obtained in 2017 by using plates from the Kitab Observatory of Ulugh Beg Astronomical Institute (UBAI) of the Uzbek Academy of Sciences. Kitab's part of Photographic Sky Survey (Russian abbreviation is FON, in next contexts) project include more than 2600 photographic plates, exposed on …
Lessons Learned from the Three-view Determination of CME Mass
de Koning, Curt A.
With only single-viewpoint, total-brightness images, it is not possible to calculate the true mass of a coronal mass ejection (CME) because total-brightness images do not contain any depth information. If two viewpoints are available, it has been suggested that total-brightness images might be used to simultaneously derive the CME deprojected mass…
The role of strength defects in shaping impact crater planforms
Watters, W. A.; Geiger, L. M.; Fendrock, M. +2 more
High-resolution imagery and digital elevation models (DEMs) were used to measure the planimetric shapes of well-preserved impact craters. These measurements were used to characterize the size-dependent scaling of the departure from circular symmetry, which provides useful insights into the processes of crater growth and modification. For example, …
Synthetic IRIS spectra of the solar transition region: Effect of high-energy tails
Vocks, C.; Dzifčáková, E.; Dudík, J.
Aims: The solar transition region satisfies the conditions for presence of non-Maxwellian electron energy distributions with high-energy tails at energies corresponding to the ionization potentials of many ions emitting in the extreme-ultraviolet and ultraviolet portions of the spectrum.
Methods: We calculate the synthetic Si iv, O iv, a…
The tilting rate of the Milky Way's disc
Debattista, Victor P.; Macciò, Andrea V.; Earp, Samuel W. F. +1 more
We present tilting rates for galaxies comparable to the Milky Way (MW) in a Λ cold dark matter cosmological hydrodynamical simulation, and compare these with the predicted tilting rate detection limit of the Gaia satellite 0.28° Gyr-1. We first identify galaxies with mass comparable to the MW (9 × 1011 ≤ M200 ≤ 1.2…