Search Publications
Calibration of Uncertainties of the Gaia DR3 Catalog Based on Data on Wide Binary Stars of the Galaxy Field
Kovaleva, D. A.
The catalog of wide binary stars [1], created on the basis of Gaia EDR3 data and including more than a million pairs, was used to analyze Gaia DR3 data obtained independently for their components. It is shown that the spatial heterogeneity of the catalog reflects the Gaia scanning law. The change in the spatial density of binary stars in the catal…
3C 120 Disk/Corona vs. Jet Variability in X-rays
Fedorova, Elena; Del Popolo, Antonio
The 3C120 (Mrk 1506, UGC 03087, Mrk 9014) is a type 1 Seyfert (Sy1)/broad-line radio galaxy (BLRG) with intriguing variable jet activity featuring "dip" and "outburst" phases. Significant X-ray observational datasets have been collected for 3C120 by INTEGRAL, XMM-Newton, SWIFT, Suzaku, and other X-ray observational facilities. The overall X-ray sp…
Solar Orbiter Data-Model Comparison in Venus' Induced Magnetotail
Jarvinen, Riku; Kallio, Esa; Edberg, Niklas J. T. +5 more
We investigate the structure of the Venusian magnetotail utilizing magnetic field and electron density measurements that cover a wide range of distances from the planet, from the first two Solar Orbiter Venus flybys. We examine the magnetic field components along the spacecraft trajectory up to 80 Venus radii down the tail. Even though the magneti…
Astrometry of Cassini ISS Images of 7 Near-ring Inner Satellites of Saturn Affected by Scattered Light
Li, Y.; Li, Z.; Wang, Z. Q. +4 more
The Imaging Science Subsystem (ISS) mounted on Cassini spacecraft took images of Saturn's inner satellites between 2004 and 2017. In some of these images, the satellites are so close to Saturn rings that their images are affected by the scattered light from Saturn rings, which results in poor, even impossible, measurements of targets. A background…
Identifying and characterizing ultracool dwarfs ejected from post-encounter disintegrating systems
Carballo-Bello, Julio A.; Gromadzki, Mariusz; Marocco, Federico +3 more
Disintegrating multiple systems have been previously discovered from kinematic studies of the Hipparcos catalogue. They are presumably the result of dynamical encounters taking place in the Galactic disc between single/multiple systems. In this paper, we aim to expand the search for such systems, to study their properties, as well as to characteri…
Assessment of Morphology and Degradation of Craters in and Around Gale Crater, Mars Using High Resolution Stereo Camera (HRSC) Images
Shaheen, Farzana; Lala, Mili Ghosh Nee; Krishna, A. P.
Timing the X-ray pulsating companion of the hot subdwarf HD 49798 with NICER
Mereghetti, Sandro; Rigoselli, Michela; Malacaria, Christian +1 more
HD 49798 is a hot subdwarf of O spectral type in a 1.55 d orbit with the X-ray source RX J0648.0-4418, a compact object with a spin period of $13.2\,$s. We use recent data from the Neutron Star Interior Composition Explorer instrument, joined with archival data from XMM-Newton and ROSAT, to obtain a phase-connected timing solution spanning ~30 yr.…
Large-Scale Ejecta of Z CMa—Proper Motion Study and New Features Discovered
Liimets, Tiina; Kraus, Michaela; Cidale, Lydia +2 more
Z Canis Majoris is a fascinating early-type binary with a Herbig Be primary and a FU Orionis-type secondary. Both of the stars exhibit sub-arcsecond jet-like ejecta. In addition, the primary is associated with the extended jet as well as with the large-scale outflow. In this study, we investigate further the nature of the large-scale outflow, whic…
Wray 15-811: An unusual runaway star
Gamen, R.; Di Mille, F.; Gramajo, L. +4 more
We investigate Wray 15-811, a poorly studied object of controversial nature. We present for the first time spectroscopic observations (at low, medium, and high resolution), together with deep narrow-band images. These original data are combined with data from public surveys, to infer the nature of this object.
We conclude that Wray 15-811 is …Behaviour of molecular hydrogen emission in three solar flares
Fletcher, Lyndsay; Mulay, Sargam M.; Labrosse, Nicolas +1 more
We have systematically investigated ultraviolet (UV) emission from molecular hydrogen (H2) using the Interface Region Imaging Spectrograph (IRIS), during three X-ray flares of C5.1, C9.7, and X1.0 classes on 2014 October 25. Significant emission from five H2 spectral lines appeared in the flare ribbons, interpreted as photoex…