Search Publications
VISION - Vienna survey in Orion. III. Young stellar objects in Orion A
Meingast, Stefan; Alves, João; Bouy, Hervé +14 more
We have extended and refined the existing young stellar object (YSO) catalogs for the Orion A molecular cloud, the closest massive star-forming region to Earth. This updated catalog is driven by the large spatial coverage (18.3 deg2, ∼950 pc2), seeing limited resolution (∼0.7″), and sensitivity (Ks < 19 mag) of …
Detection and characterisation of 54 massive companions with the SOPHIE spectrograph. Seven new brown dwarfs and constraints on the brown dwarf desert
Bouchy, F.; Deleuil, M.; Moutou, C. +35 more
Context. Brown dwarfs (BD) are substellar objects intermediate between planets and stars with masses of ~13-80 MJ. While isolated BDs are most likely produced by gravitational collapse in molecular clouds down to masses of a few MJ, a non-negligible fraction of low-mass companions might be formed through the planet-formation …
A Comparison of Flare Forecasting Methods. III. Systematic Behaviors of Operational Solar Flare Forecasting Systems
Leka, K. D.; Gallagher, Peter T.; Murray, Sophie A. +21 more
A workshop was recently held at Nagoya University (2017 October 31-November 2), sponsored by the Center for International Collaborative Research, at the Institute for Space-Earth Environmental Research, Nagoya University, Japan, to quantitatively compare the performance of today’s operational solar flare forecasting facilities. Building upon Paper…
Relationship between the Metallicity of the Circumgalactic Medium and Galaxy Orientation
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +4 more
We investigate the geometric distribution of gas metallicities in the circumgalactic medium (CGM) around 47, z < 0.7 galaxies from the “Multiphase Galaxy Halos” Survey. Using a combination of quasar spectra from Hubble Space Telescope (HST)/COS and from Keck/HIRES or Very Large Telescope/UVES, we measure column densities of, or determine limits…
Dimensionality, Coordinate System and Reference Frame for Analysis of In-Situ Space Plasma and Field Data
Wei, Y.; Zong, Q. -G.; Hasegawa, H. +11 more
In the analysis of in-situ space plasma and field data, an establishment of the coordinate system and the frame of reference, helps us greatly simplify a given problem and provides the framework that enables a clear understanding of physical processes by ordering the experimental data. For example, one of the most important tasks of space data ana…
A Diverse Array of Fluvial Depositional Systems in Arabia Terra: Evidence for mid-Noachian to Early Hesperian Rivers on Mars
Williams, Rebecca M. E.; Fawdon, Peter; Grindrod, Peter M. +4 more
Branching to sinuous ridges systems, hundreds of kilometers in length and comprising layered strata, are present across much of Arabia Terra, Mars. These ridges are interpreted as depositional fluvial channels, now preserved as inverted topography. Here we use high-resolution image and topographic data sets to investigate the morphology of these d…
Far-infrared Properties of the Bright, Gravitationally Lensed Quasar J0439+1634 at z = 6.5
Fan, Xiaohui; Keeton, Charles R.; Walter, Fabian +11 more
We present IRAM NOrthern Extended Millimeter Array, James Clerk Maxwell Telescope/Submillimetre Common-User Bolometer Array-2 and Very Large Array (VLA) observations of the most distant known gravitationally lensed quasar, J0439+1634 at z = 6.5. We detect strong dust emission, [C II] 158 µm, [C I] 369 µm, [O I] 146 µm, CO(6-5), C…
Gaia DR 2 and VLT/FLAMES search for new satellites of the LMC
Carrera, R.; Fritz, T. K.; Battaglia, G. +1 more
A wealth of tiny galactic systems populates the surroundings of the Milky Way. However, some of these objects might have originated as former satellites of the Magellanic Clouds, in particular of the Large Magellanic Cloud (LMC). Examples of the importance of understanding how many systems are genuine satellites of the Milky Way or the LMC are the…
New criteria for the selection of galaxy close pairs from cosmological simulations: evolution of the major and minor merger fraction in MUSE deep fields
Inami, H.; Steinmetz, M.; Richard, J. +8 more
It remains a challenge to assess the merger fraction of galaxies at different cosmic epochs in order to probe the evolution of their mass assembly. Using the ILLUSTRIS cosmological simulation project, we investigate the relation between the separation of galaxies in a pair, both in velocity and projected spatial separation space, and the probabili…
Time variation of Jupiter's internal magnetic field consistent with zonal wind advection
Bolton, S. J.; Connerney, J. E. P.; Cao, H. +3 more
Determination of the time dependency (secular variation) of a planet's magnetic field provides a window into understanding the dynamo responsible for generating its field. However, of the six Solar System planets with active dynamos, secular variation has been firmly established only for Earth. Here, we compare magnetic field observations of Jupit…