Search Publications
Tracking the variable jets of V404 Cygni during its 2015 outburst
Altamirano, D.; Bremer, M.; Russell, D. M. +14 more
We present multifrequency monitoring observations of the black hole X-ray binary V404 Cygni throughout its 2015 June outburst. Our data set includes radio and mm/sub-mm photometry, taken with the Karl G. Jansky Very Large Array, Arc-Minute MicroKelvin Imager Large Array, Sub-millimeter Array, James Clerk Maxwell Telescope, and the Northern Extende…
CHANG-ES. XIX. Galaxy NGC 4013: a diffusion-dominated radio halo with plane-parallel disk and vertical halo magnetic fields
Weżgowiec, M.; Dettmar, R. -J.; Beck, R. +9 more
Context. The radio continuum halos of edge-on spiral galaxies have diverse morphologies, with different magnetic field properties and cosmic ray (CR) transport processes into the halo.
Aims: Using the Continuum HAloes in Nearby Galaxies - an EVLA Survey (CHANG-ES) radio continuum data from the Karl G. Jansky Very Large Array (VLA) in two freq…
Albedos, Equilibrium Temperatures, and Surface Temperatures of Habitable Planets
Del Genio, Anthony D.; Guzewich, Scott D.; Way, Michael J. +8 more
The potential habitability of known exoplanets is often categorized by a nominal equilibrium temperature assuming a Bond albedo of either ∼0.3, similar to Earth, or 0. As an indicator of habitability, this leaves much to be desired, because albedos of other planets can be very different, and because surface temperature exceeds equilibrium temperat…
Revisiting the pulsational characteristics of the exoplanet host star β Pictoris
Reese, D. R.; Handler, G.; Wade, G. A. +21 more
Context. Exoplanet properties crucially depend on the parameters of their host stars: more accurate stellar parameters yield more accurate exoplanet characteristics. When the exoplanet host star shows pulsations, asteroseismology can be used for an improved description of the stellar parameters.
Aims: We aim to revisit the pulsational propert…
Observations of a pre-merger shock in colliding clusters of galaxies
Gu, Liyi; Mao, Junjie; Kaastra, Jelle S. +10 more
Clusters of galaxies are the largest known gravitationally bound structures in the Universe. When clusters collide, they create merger shocks on cosmological scales, which transform most of the kinetic energy carried by the cluster gaseous halos into heat1-3. Observations of merger shocks provide key information on the merger dynamics, …
Infrared Spectroscopy of Large, Low-Albedo Asteroids: Are Ceres and Themis Archetypes or Outliers?
Emery, Joshua P.; Rivkin, Andrew S.; Howell, Ellen S.
Low-albedo, hydrated objects dominate the list of the largest asteroids. These objects have varied spectral shapes in the 3-µm region, where diagnostic absorptions due to volatile species are found. Dawn's visit to Ceres has extended the view shaped by ground-based observing and shown that world to be a complex one, potentially still experie…
Hidden or missing outflows in highly obscured galaxy nuclei?
Veilleux, S.; Greve, T. R.; Gallagher, J. S. +19 more
Context. Understanding the nuclear growth and feedback processes in galaxies requires investigating their often obscured central regions. One way to do this is to use (sub)millimeter line emission from vibrationally excited HCN (HCN-vib), which is thought to trace warm and highly enshrouded galaxy nuclei. It has been suggested that the most intens…
Orbital and spectral analysis of the benchmark brown dwarf HD 4747B
Rouan, D.; Ségransan, D.; D'Orazi, V. +43 more
Context. The study of high-contrast imaged brown dwarfs and exoplanets depends strongly on evolutionary models. To estimate the mass of a directly imaged substellar object, its extracted photometry or spectrum is used and adjusted with model spectra together with the estimated age of the system. These models still need to be properly tested and co…
Physical properties of the X-ray gas as a dynamical diagnosis for galaxy clusters
Durret, F.; Lopes, P. A. A.; Laganá, T. F.
We analysed XMM-Newton EPIC data for 53 galaxy clusters. Through 2D spectral maps, we provide the most detailed and extended view of the spatial distribution of temperature (kT), pressure (P), entropy (S), and metallicity (Z) of galaxy clusters to date with the aim of correlating the dynamical state of the system to six cool-core (CC) diagnoses fr…
Comparing simulated 26Al maps to gamma-ray measurements
Krumholz, Mark R.; Diehl, Roland; Greiner, Jochen +4 more
Context. The diffuse gamma-ray emission of 26Al at 1.8 MeV reflects ongoing nucleosynthesis in the Milky Way and traces massive-star feedback in the interstellar medium due to its 1 Myr radioactive lifetime. The morphology and dynamics of the interstellar medium are investigated in astrophysics through 3D hydrodynamic simulations in fin…