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Source positions of an interplanetary type III radio burst and anisotropic radio-wave scattering
Maksimovic, Milan; Kontar, Eduard P.; Chen, Xingyao +7 more
Interplanetary solar radio type III bursts provide the means to remotely study and track energetic electrons propagating in the interplanetary medium. Due to the lack of direct radio source imaging, several methods have been developed to determine the source positions from space-based observations. Moreover, none of the methods consider the propag…
VISIONS: the VISTA Star Formation Atlas. I. Survey overview
Meingast, Stefan; Alves, João; Rottensteiner, Alena +37 more
VISIONS is an ESO public survey of five nearby (d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Australis, Lupus, Ophiuchus, and Orion. The survey was carried out with the Visible and Infrared Survey Telescope for Astronomy (VISTA), using the VISTA Infrared Camera …
Update of the INTEGRAL/IBIS active galactic nuclei catalogue: Deeper on the Galactic plane and wider beyond
Palazzi, E.; Masetti, N.; Bird, A. J. +7 more
In this work we have updated the list of active galactic nuclei (AGN) detected by INTEGRAL taking into account the new objects listed in the last published INTEGRAL/IBIS survey. We have collected 83 new AGN, increasing the number of INTEGRAL-detected active galaxies (436) by 19%. Half of these new additions are located behind the Galactic plane, a…
First detection of CHD2OH towards pre-stellar cores
Caselli, P.; Spezzano, S.; Lin, Y.
The inheritance of material across the star and planet formation process is traced by deuterium fractionation. We report here the first detection of doubly deuterated methanol towards pre-stellar cores. We study the deuterium fractionation of methanol, CH3OH, towards two starless and two pre-stellar cores. We derive a D/H ratio of 0.8-1…
Nitrogen fractionation in ammonia and its insights into nitrogen chemistry
Caselli, P.; Pineda, J. E.; Bizzocchi, L. +1 more
Context. Observations of the nitrogen isotopic ratio 14N/15N in the interstellar medium are becoming more frequent thanks to increased telescope capabilities. However, interpreting these data is still puzzling. In particular, measurements of 14N/15N in diazenylium have revealed high levels of anti-fracti…
Photometric determination of the mass accretion rates of pre-main-sequence stars. VIII. Recent star formation in NGC 299
De Marchi, G.; Vlasblom, M.
We studied the properties of the young stellar populations in the NGC 299 cluster in the Small Magellanic Cloud using observations obtained with the Hubble Space Telescope in the V, I, and Hα bands. We identified 250 stars with Hα excess exceeding 5σ and an equivalent width of the Hα emission line of at least 20 Å, which indicates that these stars…
Spectropolarimetry and spectral decomposition of high-accreting narrow-line Seyfert 1 galaxies
Czerny, Bożena; Martínez-Aldama, Mary Loli; Panda, Swayamtrupta +7 more
Context. Narrow-line Seyfert 1 (NLSy1) galaxies have been shown to have high Eddington ratios and relatively small black hole mass. The measurement of these black hole masses is based on the virial relation that is dependent on the distribution of the line-emitting gas and the viewing angle to the source. Spectropolarimetry enables us to probe the…
The ESO UVES/FEROS Large Programs of TESS OB pulsators. I. Global stellar parameters from high-resolution spectroscopy
Sana, Hugues; Bowman, Dominic M.; Aerts, Conny +7 more
Context. Modern stellar structure and evolution theory suffers from a lack of observational calibration for the interior physics of intermediate- and high-mass stars. This leads to discrepancies between theoretical predictions and observed phenomena that are mostly related to angular momentum and element transport. Analyses of large samples of mas…
Degree of stochastic asymmetry in the tidal tails of star clusters
Prusti, T.; Beccari, G.; Boffin, H. M. J. +4 more
Context. Tidal tails of star clusters are commonly understood to be populated symmetrically. Recently, the analysis of Gaia data revealed large asymmetries between the leading and trailing tidal tail arms of the four open star clusters Hyades, Praesepe, Coma Berenices, and NGC 752.
Aims: As the evaporation of stars from star clusters into the…
Chasing ICM cooling and AGN feedback from the macro to the meso scales in the galaxy cluster ZwCl 235
Gitti, M.; Brighenti, F.; Ubertosi, F.
Aims: We aim to investigate the interplay between the intracluster medium (ICM) and the active galactic nucleus (AGN) in ZwCl 235, a galaxy cluster with high X-ray flux, an extended central radio galaxy, and evidence of multiphase gas at its center.
Methods: Using archival data from the Chandra telescope, the Very Large Array Sky Survey …