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Detection of AGNs and Quasars with Significant Proper Motions Based on Gaia Data in the SRG/eROSITA Catalog of X-ray Sources
Irtuganov, E. N.; Bikmaev, I. F.; Gilfanov, M. R. +4 more
Based on a comparison of the SRG/eROSITA catalog of X-ray active stars and the Gaia catalog, we have obtained a sample of 502 peculiar objects for which Gaia, on the one hand, detects statistically significant parallaxes or proper motions and, on the other hand, records signs of a nonzero optical extent. On the $FX/F_{\textrm{opt}}$-col…
Accretion history of AGN: Estimating the host galaxy properties in X-ray luminous AGN from z = 0-3
Kirkpatrick, Allison; Marchesi, Stefano; LaMassa, Stephanie +10 more
We aim to determine the intrinsic far-Infrared (far-IR) emission of X-ray-luminous quasars over cosmic time. Using a 16 deg2 region of the Stripe 82 field surveyed by XMM-Newton and Herschel Space Observatory, we identify 2905 X-ray luminous (LX > 1042 erg/s) active galactic nuclei (AGN) in the range z ≈ 0-3. Th…
Nightside Auroral Electrons at Mars: Upstream Drivers and Ionospheric Impact
Liemohn, Michael W.; Mazelle, Christian; Xu, Shaosui +12 more
Discrete aurorae have been observed at Mars by multiple spacecraft, including Mars Express, Mars Atmosphere and Volatile EvolutioN (MAVEN), and most recently the United Arab Emirates Hope spacecraft. Meanwhile, there have been studies on the source particles responsible for producing these detectable aurorae (termed "auroral electrons"). By utiliz…
Direct Far-infrared Metal Abundances (FIRA). I. M101
Smith, J. D.; Groves, B.; Linden, S. T. +12 more
Accurately determining gas-phase metal abundances within galaxies is critical as metals strongly affect the physics of the interstellar medium. To date, the vast majority of widely used gas-phase abundance indicators rely on emission from bright optical lines, whose emissivities are highly sensitive to the electron temperature. Alternatively, dire…
Radiative losses in the chromosphere during a C-class flare
Leenaarts, J.; de la Cruz Rodríguez, J.; Díaz Baso, C. J. +2 more
Context. Solar flares release an enormous amount of energy (∼1032 erg) into the corona. A substantial fraction of this energy is transported to the lower atmosphere, which results in chromospheric heating. The mechanisms that transport energy to the lower solar atmosphere during a flare are still not fully understood.
Aims: We aim …
Variable Star Population in the Open Cluster NGC 6791 Observed by the Kepler Spacecraft
Németh, P.; Sahoo, S. K.; Baran, A. S. +3 more
We present the list of variable stars we found in the Kepler superstamp data covering approximately 9' from the central region of NGC 6791. We classified the variable stars based on the variability type and we established their cluster membership based on the available Gaia Early Data Release 3 astrometry, by means of the Bayesian Gaussian mixture…
MUSE spectroscopic observations of the young massive cluster NGC 1850
Bragaglia, A.; D'Orazi, V.; Carretta, E. +4 more
Context. The double cluster NGC 1850 in the Large Magellanic Cloud is the nearest young massive cluster of the Local Group with a mass similar to those of Galactic globular clusters. Recent studies have revealed an extended morphology of its main-sequence turn-off (MSTO), which can be interpreted as a spread in either age or internal rotation. In …
A Molecular Gas Ring Hidden in the Sombrero Galaxy
Fadda, Dario; Sutter, Jessica
We present Herschel, ALMA, and MUSE observations of the molecular ring of Messier 104, also known as the Sombrero galaxy. These previously unpublished archival data shed new light on the content of the interstellar medium of M104. In particular, molecular hydrogen measured by CO emission and dust measured by far-infrared light are uniformly distri…
Multiple components in the molecular outflow of the red supergiant NML Cyg
De Beck, E.; Andrews, H.; Hirvonen, P.
Despite their large impact on stellar and galactic evolution, the properties of outflows from red supergiants are not well characterized. We used the Onsala 20m telescope to perform a spectral survey at 3 and 4 mm (68-116 GHz) of the red supergiant NML Cyg, alongside the yellow hypergiant IRC + 10420. Our observations of NML Cyg were combined with…
Distance and age of the massive stellar cluster Westerlund 1 - II. The eclipsing binary W36
Damineli, Augusto; Mace, Gregory N.; Navarete, Felipe +3 more
Westerlund 1 (Wd 1) is one of the most relevant star clusters in the Milky Way to study massive star formation, although it is still poorly known. Here, we used photometric and spectroscopic data to model the eclipsing binary W36, showing that its spectral type is O6.5 III + O9.5 IV, hotter and more luminous than thought before. Its distance d