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APOGEE-2S view of the globular cluster Patchick 125 (Gran 3). New metallicity and elemental abundances from high-resolution spectroscopy
Minniti, Dante; Fernández-Trincado, José G.; Villanova, Sandro +1 more
We present detailed elemental abundances, radial velocity, and orbital elements for Patchick 125, a recently discovered metal-poor globular cluster (GC) in the direction of the Galactic bulge. Near-infrared high-resolution (R ∼ 22 500) spectra of two members were obtained during the second phase of the Apache Point Observatory Galactic Evolution E…
Candidate isolated neutron stars in the 4XMM-DR10 catalogue of X-ray sources
Mereghetti, Sandro; Rigoselli, Michela; Tresoldi, Caterina
Most isolated neutron stars have been discovered thanks to the detection of their pulsed non-thermal emission, at wavelengths spanning from radio to gamma-rays. However, if the beamed non-thermal radiation does not intercept our line of sight or it is too faint or absent, isolated neutron stars can also be detected through their thermal emission, …
The Interstellar Medium of Dwarf Galaxies
Hunt, Leslie K.; Izotov, Yuri I.; Henkel, Christian
Dwarf galaxies are by far the most numerous galaxies in the Universe, showing properties that are quite different from those of their larger and more luminous cousins. This review focuses on the physical and chemical properties of the interstellar medium of those dwarfs that are known to host significant amounts of gas and dust. The neutral and io…
Unveiling the past evolution of the progenitor of the Helmi streams
Helmi, A.; Cassisi, S.; Gallart, C. +2 more
Aims: We aim to determine unique features that characterise the past evolution of the progenitor of the Helmi streams through the analysis of star formation histories (SFHs).
Methods: From the 5D Gaia EDR3 dataset, we extracted local samples of stars dominated by the Helmi streams, the Galactic (thick and thin) disc, and the local retrog…
The super-soft source phase of the recurrent nova V3890 Sgr
Ness, J. -U.; Pinto, C.; Singh, K. P. +9 more
Context. The 30-yr recurrent symbiotic nova V3890 Sgr exploded on 2019 August 28 and was observed with multiple X-ray telescopes. Swift and AstroSat monitoring revealed slowly declining hard X-ray emission from shocks between the nova ejecta and the stellar wind of the companion. Later, highly variable super-soft-source (SSS) emission was seen. An…
Multicomponent DHOST analysis in galaxy clusters
Umetsu, Keiichi; Salzano, Vincenzo; Laudato, Enrico
Extended theories of gravity with additional scalar degrees of freedom have recently acquired increasing interest due to the presence of a screening mechanism that allows suppressing at small scales (e.g. the Solar system scale) every modification restoring general relativity (GR). In this work, we consider a second-order extended theory of gravit…
7Be in the outburst of the ONe nova V6595 Sgr
Bonifacio, P.; Hernanz, M.; D'Odorico, V. +7 more
We report on the search for the 7Be II isotope in the outbursts of the classical nova V6595 Sgr by means of high-resolution Ultraviolet and Visual Echelle Spectrograph (UVES) observations taken at the European Southern Observatory's Very Large Telescope in 2021 April, about two weeks after its discovery and under difficult circumstances…
The formation of the Milky Way halo and its dwarf satellites: A NLTE-1D abundance analysis. V. The Sextans galaxy
Jablonka, P.; Yakovleva, S. A.; Belyaev, A. K. +3 more
We present a homogeneous set of accurate atmospheric parameters for a sample of eleven very metal-poor (-3.32 ≤ [Fe/H] ≤-2.61) stars in the Sextans dwarf spheroidal galaxy (dSph) and the non-local thermodynamic equilibrium (NLTE) abundances of, at least, seven chemical elements based on high-resolution UVES/VLT and HDS/Subaru spectra. For each sta…
Testing High-energy Emission Models for Blazars with X-Ray Polarimetry
Liodakis, Ioannis; Peirson, Abel L.; Romani, Roger W.
Both leptonic and hadronic emission processes may contribute to blazar jet emission; which dominates in blazars' high-energy emission component remains an open question. Some intermediate synchrotron peaked blazars transition from their low- to high-energy emission components in the X-ray band making them excellent laboratories to probe both compo…
Searching for TESS Photometric Variability of Possible JWST Spectrophotometric Standard Stars
Gordon, Karl D.; Hermes, J. J.; Fleming, Scott W. +7 more
We use data from the Transiting Exoplanet Survey Satellite (TESS) to search for, and set limits on, optical to near-infrared photometric variability of the well-vetted, candidate James Webb Space Telescope (JWST) spectrophotometric standards. Our search of 37 of these candidate standards has revealed measurable periodic variability in 15 stars. Th…