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A blazar candidate for the Fermi source 4FGL J1848.7-0129
Luque-Escamilla, Pedro L.; Martí, Josep; Combi, Jorge A. +2 more
The Fermi source 4FGL J1848.7-0129 has been historically related to the globular cluster GLIMPSE-C01 since its very first detection. Although this association is widely accepted, as it appears in the most recent Fermi catalogue, it deserves to be revisited given the multiwavelength evidences and the recent discovery of variable X-ray sources in th…
Analysis of integral field spectroscopy observations of the planetary nebula Hen 2-108 and its central star
Corradi, Romano L. M.; Akras, Stavros; Todt, Helge +3 more
The study of planetary nebulae provides important constraints for many aspects of stellar and Galactic evolution. Hen 2-108 is a poorly known planetary nebula with a slight elliptical morphology and a peculiar central star (CS), which has defied classification. In this work, we present the first detailed integral field spectroscopic study of the p…
Astrometric detection of binary asteroids
Ofek, Eran O.; Polishook, David; Segev, Noam
Binary asteroids probe thermal-radiation effects on the main-belt asteroids' evolution. We discuss the possibility of detecting binary minor planet systems by the astrometric wobble of the centre of light around the centre of mass. This method enables the exploration of the phase-space of binary asteroids, which is difficult to explore using commo…
Testing the Interaction between a Substellar Companion and a Debris Disk in the HR 2562 System
Duchêne, Gaspard; Oppenheimer, Rebecca; Rice, Malena +51 more
The HR 2562 system is a rare case where a brown dwarf companion resides in a cleared inner hole of a debris disk, offering invaluable opportunities to study the dynamical interaction between a substellar companion and a dusty disk. We present the first ALMA observation of the system as well as the continued Gemini Planet Imager monitoring of the c…
Statistical Analysis of the Probability of Interaction of Globular Clusters with Each Other and with the Galactic Center on the Cosmological Time Scale According to Gaia DR2 Data
Ishchenko, M.; Sobolenko, M.; Berczik, P. +1 more
This study is aimed at investigating the dynamic evolution of the orbits of stellar globular clusters (SGCs). To integrate the orbits backward in time, the authors use models of the time-varying potentials derived from cosmological simulations, which are closest to the potential of the Galaxy. This allows for estimating the probability of close pa…
The multizone chemical evolution of the Galactic bulge: predicting abundances for different radial zones
Mollá, M.; Cavichia, O.; Bazán, J. J.
Due to its proximity, the stellar populations of the Galactic bulge (GB) can be resolved and can be studied in detail. This allows tracing the bulge metallicity distribution function (MDF) for different spatial regions within the bulge, which may give us clues about the bulge formation and evolution scenarios. In this work, we developed a chemical…
A cross-type imaging electron spectrometer
Fu, SuiYan; Wang, YongFu; Zong, QiuGang +6 more
Magnetic field fluctuations in the shocked umbral chromosphere
Asensio Ramos, A.; González Manrique, S. J.; Felipe, T. +1 more
Context. Umbral chromospheric observations show the presence of magnetoacoustic shocks. Several recent studies have reported magnetic field fluctuations associated with these shock waves. The mechanism behind these periodic magnetic field changes is still an unresolved question.
Aims: We aim to study the properties and origin of magnetic fiel…
TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star
Vanderburg, Andrew; Latham, David W.; Cochran, William D. +40 more
We report the discovery of a hot (Teq ≈ 1055 K) planet in the small-planet radius valley that transits the Sun-like star TOI-733. It was discovered as part of the KESPRINT follow-up program of TESS planets carried out with the HARPS spectrograph. TESS photometry from sectors 9 and 36 yields an orbital period of {P{{orb}}} = 4…
Signatures of feedback in the spectacular extended emission region of NGC 5972
Koss, Michael; Sartori, Lia F.; Maksym, W. Peter +10 more
We present Chandra X-ray Observatory observations and Space Telescope Imaging Spectrograph spectra of NGC 5972, one of the 19 'Voorwerpjes' galaxies. This galaxy contains an extended emission-line region (EELR) and an arcsecond scale nuclear bubble. NGC 5972 is a faded active galactic nucleus (AGN), with EELR luminosity suggesting a 2.1 dex decrea…