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Vibrationally excited HC3N emission in NGC 1068: tracing the recent star formation in the starburst ring
Martín-Pintado, J.; García-Burillo, S.; González-Alfonso, E. +5 more
Using the ALMA data, we have studied the HC3N and continuum emission in the starburst pseudo-ring (SB pseudo-ring) and the circumnuclear disc (CND) of the SB/active galactic nucleus (AGN) composite galaxy NGC 1068. We have detected emission from vibrationally excited HC3N (HC3N*) only towards one star-forming regio…
APOGEE-2 Discovery of a Large Population of Relatively High-metallicity Globular Cluster Debris
Bizyaev, Dmitry; Pan, Kaike; Majewski, Steven R. +13 more
We report the discovery of a new, chemically distinct population of relatively high-metallicity ([Fe/H] > -0.7) red giant stars with super-solar [N/Fe] (≳+0.75) identified within the bulge, disk, and halo of the Milky Way. This sample of stars was observed during the second phase of the Apache Point Observatory Galactic Evolution Experiment (AP…
Large closed-field corona of WX Ursae Majoris evidenced from radio observations
Ray, T. P.; Vidotto, A. A.; Callingham, J. R. +5 more
The space-weather conditions that result from stellar winds significantly impact the habitability of exoplanets. The conditions can be calculated from first principles if the necessary boundary conditions are specified, namely the plasma density in the outer corona and the radial distance at which the plasma forces the closed magnetic field into a…
Canis Major OB1 stellar group contents revealed by Gaia
Mendes de Oliveira, C.; Borges Fernandes, M.; Bonatto, C. +15 more
Canis Major OB1 (CMa OB1) is a Galactic stellar association with a very intriguing star-formation scenario. There are more than two dozen known star clusters in its line of sight, but it is not clear which ones are physically associated with CMa OB1. We use a clustering code that employs five-dimensional data from the Gaia DR2 catalogue to identif…
HD 22496 b: The first ESPRESSO stand-alone planet discovery
Rebolo, R.; Pallé, E.; Zapatero Osorio, M. R. +32 more
Context. The ESPRESSO spectrograph is a new powerful tool developed to detect and characterize extrasolar planets. Its design allows an unprecedented radial velocity precision (down to a few tens of cm s−1) and long-term thermomechanical stability.
Aims: We present the first stand-alone detection of an extrasolar planet by blind ra…
The Blue Straggler Population of the Open Clusters Trumpler 5, Trumpler 20, and NGC 2477
Monaco, L.; Villanova, S.; Carraro, G. +3 more
We present a study based on Gaia DR2 of the population of blue straggler stars in the open clusters Trumpler 5, Trumpler 20, and NGC 2477. All candidates were selected according to their position in the color-magnitude diagram, their proper motion components, and their parallax. We also looked for yellow stragglers, i.e., possible evolved blue str…
Calibration of mid- to far-infrared spectral lines in galaxies
Spinoglio, Luigi; Mordini, Sabrina; Fernández-Ontiveros, Juan Antonio
Context. Mid- to far-infrared (IR) lines are suitable in the study of dust-obscured regions in galaxies because dust extinction strongly decreases with wavelength, and therefore IR spectroscopy allows us to explore the most hidden regions of galaxies, where heavily obscured star formation as well as accretion onto supermassive black holes at the n…
Outbursts and stellar properties of the classical Be star HD 6226
Gies, Douglas R.; Wang, Luqian; Richardson, Noel D. +58 more
The bright and understudied classical Be star HD 6226 has exhibited multiple outbursts in the last several years during which the star grew a viscous decretion disc. We analyse 659 optical spectra of the system collected from 2017 to 2020, along with a ultraviolet spectrum from the Hubble Space Telescope and high cadence photometry from both Trans…
The history of metal enrichment traced by X-ray observations of high-redshift galaxy clusters
Allen, Steven W.; Canning, Rebecca E. A.; McDonald, Michael +7 more
We present the analysis of deep X-ray observations of 10 massive galaxy clusters at redshifts 1.05 < z < 1.71, with the primary goal of measuring the metallicity of the intracluster medium (ICM) at intermediate radii, to better constrain models of the metal enrichment of the intergalactic medium. The targets were selected from X-ray and Suny…
Quiescent galaxies in a virialized cluster at redshift 2: evidence for accelerated size growth
Brammer, G.; Stanford, S. A.; Allen, S. W. +4 more
We present an analysis of the galaxy population in XLSSC 122, an X-ray-selected, virialized cluster at redshift z = 1.98. We utilize Hubble Space Telescope (HST)Wide Field Camera 3 (WFC3) photometry to characterize the activity and morphology of spectroscopically confirmed cluster members. The quiescent fraction is found to be $88^{+4}_{-20}$ per …