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Tectono-Magmatic, Sedimentary, and Hydrothermal History of Arsinoes and Pyrrhae Chaos, Mars
Altieri, Francesca; Rossi, Angelo Pio; Carli, Cristian +1 more
Arsinoes and Pyrrhae Chaos are two adjacent chaotic terrains located east of Valles Marineris and west of Arabia Terra, on Mars. In this work, we produced a morpho-stratigraphic map of the area, characterized by a volcanic bedrock disrupted into polygonal mesas and knobs (Chaotic Terrain Unit) and two nondisrupted units. The latter present a spect…
Deriving star cluster parameters with convolutional neural networks. II. Extinction and cluster-background classification
Narbutis, D.; Bialopetravičius, J.
Context. Convolutional neural networks (CNNs) have been established as the go-to method for fast object detection and classification of natural images. This opens the door for astrophysical parameter inference on the exponentially increasing amount of sky survey data. Until now, star cluster analysis was based on integral or resolved stellar photo…
The disruption of the low-mass globular cluster E 3
Carballo-Bello, Julio A.; Piatti, Andrés E.; Salinas, Ricardo
We use Gaia DR2 photometry and proper motions to search for the hypothetical tidal tails of the Galactic globular cluster E 3. Using a modified version of a classical decontamination procedure, we are able to identify the presence of an extended structure emerging from the cluster up to r ∼ 1 deg from its centre, thus suggesting that this poorly s…
INTEGRAL view of AGN
Pian, Elena; Sazonov, Sergey; Bassani, Loredana +5 more
AGN are among the most energetic phenomena in the Universe and in the last two decades INTEGRAL's contribution in their study has had a significant impact. Thanks to the INTEGRAL extragalactic sky surveys, all classes of soft X-ray detected (in the 2-10 keV band) AGN have been observed at higher energies as well. Up to now, around 450 AGN have bee…
Accretion and Intercycle Variations in the PMS Interacting Binary AK Sco
France, Kevin; Gómez de Castro, Ana I.; Vallejo, Juan Carlos +2 more
There are only a handful of known short-period pre-main-sequence spectroscopic binaries with significant accretion rates (Class II sources). AK Sco stands out in this list because the system is composed of two equal mass F5 stars in a highly eccentric orbit thus both stars get as close as 11 stellar radii at periastron passage. This configuration …
Optical properties of cometary particles collected by COSIMA: Assessing the differences between microscopic and macroscopic scales
Langevin, Y.; Schulz, R.; Hilchenbach, M. +6 more
The COSIMA mass spectrometer on-board Rosetta was equipped with an optical microscope, Cosiscope, which identified several 10,000 cometary particles collected on targets exposed during the orbital phase around the nucleus of comet 67P Churyumov-Gerasimenko. The median value of reflectance factors evaluated from Cosiscope images for large collected…
Penumbral Brightening Events Observed in AR NOAA 12546
Stangalini, Marco; Ermolli, Ilaria; Giorgi, Fabrizio +2 more
Penumbral transient brightening events have been attributed to magnetic reconnection episodes occurring in the low corona. We investigated the trigger mechanism of these events in active region NOAA 12546 by using multiwavelength observations obtained with the Interferometric Bidimensional Spectrometer, by the Solar Dynamics Observatory, the Inter…
The proper motion of sub-populations in ω Centauri
Pancino, E.; Sanna, N.; Stetson, P. B. +2 more
The galactic globular cluster ω Centauri is the most massive of its kind, with a complex mix of multiple stellar populations and several kinematic and dynamical peculiarities. Different mean proper motions have been detected among the three main sub-populations, implying that the most metal-rich one is of accreted origin. This particular piece of …
Searching for optical companions to four binary millisecond pulsars with the Gran Telescopio Canarias
Zharikov, S. V.; Karpova, A. V.; Zyuzin, D. A. +6 more
We report on multiband photometric observations of four binary millisecond pulsars with the Gran Telescopio Canarias. The observations led to detection of binary companions to PSRs J1630+3734, J1741+1351, and J2042+0246 in the Sloan g', r', and I' bands. Their magnitudes in the r' band are ≈24.4, 24.4, and 24.0, respectively. We also set a 3σ uppe…
Relationships between Interplanetary Coronal Mass Ejection Characteristics and Geoeffectiveness in the Declining Phase of Solar Cycles 23 and 24
Moon, Y. -J.; Shanmugaraju, A.; Lawrance, M. Bendict
In this paper, we have examined the relationships between the characteristics of interplanetary coronal mass ejections (ICMEs) and geoeffectiveness in the declining phase of Solar Cycles 23 and 24. We discuss the results in comparison with those of the rising phase. Major results of this study are as follows: The ICMEs in the declining phase of Cy…