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Improving the open cluster census. I. Comparison of clustering algorithms applied to Gaia DR2 data
Reffert, Sabine; Hunt, Emily L.
Context. The census of open clusters in the Milky Way is in a never-before seen state of flux. Recent works have reported hundreds of new open clusters thanks to the incredible astrometric quality of the Gaia satellite, but other works have also reported that many open clusters discovered in the pre Gaia era may be associations.
Aims: We aim …
Deep Extragalactic VIsible Legacy Survey (DEVILS): SED fitting in the D10-COSMOS field and the evolution of the stellar mass function and SFR-M⋆ relation
Holwerda, Benne W.; Hopkins, Andrew M.; Driver, Simon P. +11 more
We present catalogues of stellar masses, star formation rates (SFRs), and ancillary stellar population parameters for galaxies spanning 0 < z < 9 from the Deep Extragalactic VIsible Legacy Survey (DEVILS). DEVILS is a deep spectroscopic redshift survey with very high completeness, covering several premier deep fields including COSMOS (D10). …
The ART-XC telescope on board the SRG observatory
Sunyaev, R.; Krivonos, R.; Sazonov, S. +59 more
Astronomical Roentgen Telescope - X-ray Concentrator (ART-XC) is the hard X-ray instrument with grazing incidence imaging optics on board the Spektr-Roentgen-Gamma (SRG) observatory. The SRG observatory is the flagship astrophysical mission of the Russian Federal Space Program, which was successively launched into orbit around the second Lagrangia…
Chemical enrichment and radial migration in the Galactic disc - the origin of the [αFe] double sequence
Bland-Hawthorn, Joss; Hayden, Michael R.; Sharma, Sanjib
The ([α/Fe], [Fe/H]) distribution of Milky Way stars shows at least two distinct sequences, which have traditionally been associated with the thin and thick disc components. The abundance distribution varies systematically with location R and |z| across the Galaxy. We reproduce this using an analytical chemodynamical model that includes the effect…
Detection of the Milky Way reflex motion due to the Large Magellanic Cloud infall
Peñarrubia, Jorge; Petersen, Michael S.
The Large Magellanic Cloud is the most massive satellite galaxy of the Milky Way, with an estimated mass exceeding a tenth of the mass of the Milky Way1-5. Just past its closest approach of about 50 kpc, and flying past the Milky Way at an astonishing speed of 327 km s−1 (ref. 6), the Large Magellanic Cloud can aff…
The GALAH survey: tracing the Galactic disc with open clusters
Baratella, M.; Freeman, K. C.; Cantat-Gaudin, T. +28 more
Open clusters are unique tracers of the history of our own Galaxy's disc. According to our membership analysis based on Gaia astrometry, out of the 226 potential clusters falling in the footprint of the GALactic Archaeology with HERMES (GALAH) survey or the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey, we find that 205 ha…
orvara: An Efficient Code to Fit Orbits Using Radial Velocity, Absolute, and/or Relative Astrometry
Dupuy, Trent J.; Bardalez Gagliuffi, Daniella C.; Brandt, Timothy D. +5 more
We present an open-source Python package, Orbits from Radial Velocity, Absolute, and/or Relative Astrometry (orvara), to fit Keplerian orbits to any combination of radial velocity, relative astrometry, and absolute astrometry data from the Hipparcos-Gaia Catalog of Accelerations. By combining these three data types, one can measure precise masses …
A Comparative Study of Atmospheric Chemistry with VULCAN
Heng, Kevin; Tsai, Shang-Min; Kitzmann, Daniel +4 more
We present an update of the open-source photochemical kinetics code VULCAN to include C-H-N-O-S networks and photochemistry. The additional new features are advection transport, condensation, various boundary conditions, and temperature-dependent UV cross sections. First, we validate our photochemical model for hot Jupiter atmospheres by performin…
An uncontaminated measurement of the escaping Lyman continuum at z 3
Steidel, Charles C.; Reddy, Naveen A.; Shapley, Alice +2 more
Observations of reionization-era analogues at z ~ 3 are a powerful tool for constraining reionization. Rest-ultraviolet observations are particularly useful, in which both direct and indirect tracers of ionizing-photon production and escape can be observed. We analyse a sample of 124 z ~ 3 galaxies from the Keck Lyman Continuum Spectroscopic Surve…
The DECam Local Volume Exploration Survey: Overview and First Data Release
Bechtol, K.; Zenteno, A.; Abbott, T. M. C. +69 more
The DECam Local Volume Exploration survey (DELVE) is a 126-night survey program on the 4 m Blanco Telescope at the Cerro Tololo Inter-American Observatory in Chile. DELVE seeks to understand the characteristics of faint satellite galaxies and other resolved stellar substructures over a range of environments in the Local Volume. DELVE will combine …