Search Publications
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 …
Cosmological implications of the anisotropy of ten galaxy cluster scaling relations
Lovisari, L.; Pacaud, F.; Ramos-Ceja, M. E. +5 more
The hypothesis that the late Universe is isotropic and homogeneous is adopted by most cosmological studies, including studies of galaxy clusters. The cosmic expansion rate H0 is thought to be spatially constant, while bulk flows are often presumed to be negligible compared to the Hubble expansion, even at local scales. The effects of bu…
The evolution of the galaxy stellar-mass function over the last 12 billion years from a combination of ground-based and HST surveys
Cullen, F.; McLure, R. J.; Dunlop, J. S. +3 more
We present a new determination of the galaxy stellar-mass function (GSMF) over the redshift interval 0.25 ≤ z ≤ 3.75, derived from a combination of ground-based and Hubble Space Telescope (HST) imaging surveys. Based on a near-IR-selected galaxy sample selected over a raw survey area of 3 deg2 and spanning ≥4 dex in stellar mass, we fit…
The LSST DESC DC2 Simulated Sky Survey
Aubourg, Éric; Wood-Vasey, W. Michael; Mandelbaum, Rachel +77 more
We describe the simulated sky survey underlying the second data challenge (DC2) carried out in preparation for analysis of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) by the LSST Dark Energy Science Collaboration (LSST DESC). Significant connections across multiple science domains will be a hallmark of LSST; the DC2 progra…
A highly magnetized and rapidly rotating white dwarf as small as the Moon
Kulkarni, S. R.; Duev, Dmitry A.; Burdge, Kevin B. +15 more
White dwarfs represent the last stage of evolution of stars with mass less than about eight times that of the Sun and, like other stars, are often found in binaries1,2. If the orbital period of the binary is short enough, energy losses from gravitational-wave radiation can shrink the orbit until the two white dwarfs come into contact an…