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Imaging polarimetry of comet 67 P/Churyumov-Gerasimenko: homogeneous distribution of polarization and its implications
Kolokolova, Ludmilla; Moreno, Fernando; Snodgrass, Colin +8 more
Comet 67P/Churyumov-Gerasimenko (67P) become observable for the first time in 2021 since the Rosetta rendezvous in 2014-2016. Here, we present pre-perihelion polarimetric measurements of 67P from 2021 performed with the Very Large Telescope (VLT), as well as post-perihelion polarimetric measurements from 2015 to 2016 obtained with the VLT and the …
BASS: XLIII. Optical, UV, and X-ray emission properties of unobscured Swift/BAT active galactic nuclei
Ueda, Yoshihiro; Kawamuro, Taiki; Ricci, Claudio +19 more
We present one of the largest multiwavelength studies of simultaneous optical-to-X-ray spectral energy distributions (SEDs) of unobscured (NH < 1022 cm‑2) active galactic nuclei (AGN) in the local Universe. Using a representative sample of hard-X-ray-selected AGN from the 70-month Swift/BAT catalog, with optical…
NSCs from groups to clusters: a catalogue of dwarf galaxies in the Shapley supercluster and the role of environment in galaxy nucleation
Chies-Santos, Ana L.; Blakeslee, John P.; Sánchez-Janssen, Rubén +2 more
Nuclear star clusters (NSCs) are dense star clusters located at the centre of galaxies spanning a wide range of masses and morphologies. Analysing NSC occupation statistics in different environments provides an invaluable window into investigating early conditions of high-density star formation and mass assembly in clusters and group galaxies. We …
Chemical Evolution of R-process Elements in Stars (CERES): II. The impact of stellar evolution and rotation on light and heavy elements
Hansen, Camilla Juul; Meynet, Georges; Romano, Donatella +4 more
Context. Carbon, nitrogen, and oxygen are the most abundant elements throughout the universe, after hydrogen and helium. Studying these elements in low-metallicity stars can provide crucial information on the chemical composition in the early Galaxy and possible internal mixing processes that can alter the surface composition of the stars. Aims. T…
Climatology and Diurnal Variation of Ozone Column Abundances for 2.5 Mars Years as Measured by the NOMAD-UVIS Spectrometer
Vandaele, A. C.; Daerden, F.; Ristic, B. +14 more
The distribution of Mars ozone (O3) is well established; however, our knowledge on the dayside diurnal variation of O3 is limited. We present measurements of Mars O3 column abundances, spanning Mars Year (MY) 34 to the end of MY 36, by the Ultraviolet and VIsible Spectrometer (UVIS), part of the Nadir and Occultati…
Erratum: "Stellar Loci. VII. Photometric Metallicities of 5 Million FGK Stars Based on GALEX GR6+7 AIS and Gaia EDR3" (2024, ApJS, 271, 26)
Huang, Yang; Beers, Timothy C.; Yuan, Haibo +5 more
We combine photometric data from GALEX GR6+7 AIS and Gaia EDR3 with stellar parameters from the SAGA and PASTEL catalogs to construct high-quality training samples for dwarfs ($\rm 0.4< BP-RP<1.6$) and giants ($\rm 0.6< BP-RP <1.6$). We apply careful reddening corrections using empirical temperature- and extinction-dependent extinction…
Solar Wind Density and Core Temperature Derived from the PSP Quasi-thermal Noise Measurements
Liu, Mingzhe; Liu, Kaijun; Pierrard, Viviane +6 more
Quasi-thermal noise (QTN) spectroscopy is a valuable method to deduce important parameters in space plasma, such as plasma density and temperature, especially when direct particle measurements are not available. The present study develops a new fitting method to fit the QTN spectra observed by the Parker Solar Probe (PSP) with a comprehensive theo…
Eta-Earth Revisited II: Deriving a Maximum Number of Earth-Like Habitats in the Galactic Disk
Lammer, Helmut; Scherf, Manuel; Spross, Laurenz
In Lammer et al. (2024), we defined Earth-like habitats (EHs) as rocky exoplanets within the habitable zone of complex life (HZCL) on which Earth-like N2-O2-dominated atmospheres with minor amounts of CO2 can exist, and derived a formulation for estimating the maximum number of EHs in the galaxy given realistic pro…
Where do they come from?. Identification of escaped globular cluster stars
Tian, Hao; Huang, Yang; Wang, Long +5 more
Globular clusters (GCs), as old as our Galaxy, constantly lose their members to the field as they cross through the Milky Way (MW). These escaped GC stars (or escapees) are thought to contribute significantly to the MW halo. If a star left the host GC a long time ago, chemical finger prints (e.g., N enrichment) may reveal its origin. In this work …
Asteroid Orbit Determination Using Gaia FPR: Statistical Analysis
Naidu, Shantanu P.; Farnocchia, Davide; Park, Ryan S. +1 more
The Gaia mission has provided astrometric observations of unprecedented accuracy for more than 156,000 asteroids. The reported astrometric uncertainties are of the order of milliarcseconds, about 2 orders of magnitude smaller than that of traditional ground-based observations. The accuracy of Gaia data requires a high-fidelity orbit determination …