Search Publications
Galactic cirri in deep optical imaging
Trujillo, Ignacio; Román, Javier; Montes, Mireia
The ubiquitous presence of Galactic cirri in deep optical images represents a major obstacle to study the low surface brightness features of extragalactic sources. To address this issue, we have explored the optical properties of cirri using g, r, i, and z bands in the Sloan Digital Sky Survey (SDSS) Stripe82 region. Using state-of-the-art, custom…
Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions
Li, X.; Ukhorskiy, A. Y.; Fennell, J. F. +4 more
The past decade transformed our observational understanding of energetic particle processes in near-Earth space. An unprecedented suite of observational systems was in operation including the Van Allen Probes, Arase, Magnetospheric Multiscale, Time History of Events and Macroscale Interactions during Substorms, Cluster, GPS, GOES, and Los Alamos N…
Properties of the dense core population in Orion B as seen by the Herschel Gould Belt survey
White, G. J.; André, Ph.; Arzoumanian, D. +15 more
We present a detailed study of the Orion B molecular cloud complex (d ~ 400 pc), which was imaged with the PACS and SPIRE photometric cameras at wavelengths from 70 to 500 µm as part of the Herschel Gould Belt survey (HGBS). We release new high-resolution maps of column density and dust temperature for the whole complex, derived in the same …
Expected performances of the Characterising Exoplanet Satellite (CHEOPS). III. Data reduction pipeline: architecture and simulated performances
Guterman, P.; Deleuil, M.; Benz, W. +4 more
The CHaracterizing ExOPlanet Satellite (CHEOPS) is set to be launched in December 2019 and will detect and characterize small size exoplanets via ultra high precision photometry during transits. CHEOPS is designed as a follow-up telescope and therefore it will monitor a single target at a time. The scientific users will retrieve science-ready ligh…
Atmospheric Dynamics of Hot Giant Planets and Brown Dwarfs
Showman, Adam P.; Parmentier, Vivien; Tan, Xianyu
Groundbased and spacecraft telescopic observations, combined with an intensive modeling effort, have greatly enhanced our understanding of hot giant planets and brown dwarfs over the past ten years. Although these objects are all fluid, hydrogen worlds with stratified atmospheres overlying convective interiors, they exhibit an impressive diversity…
Very regular high-frequency pulsation modes in young intermediate-mass stars
Smalley, Barry; Li, Yaguang; Li, Gang +33 more
Asteroseismology probes the internal structures of stars by using their natural pulsation frequencies1. It relies on identifying sequences of pulsation modes that can be compared with theoretical models, which has been done successfully for many classes of pulsators, including low-mass solar-type stars2, red giants3
The dark matter interpretation of the 3.5-keV line is inconsistent with blank-sky observations
Safdi, Benjamin R.; Dessert, Christopher; Rodd, Nicholas L.
Observations of nearby galaxies and galaxy clusters have reported an unexpected x-ray emission line around 3.5 kilo-electron volts (keV). Proposals to explain this line include decaying dark matter—in particular, that the decay of sterile neutrinos with a mass around 7 keV could match the available data. If this interpretation is correct, the 3.5-…
A naked-eye triple system with a nonaccreting black hole in the inner binary
Rivinius, Th.; Baade, D.; Klement, R. +2 more
Several dozen optical echelle spectra demonstrate that
NIHAO-UHD: the properties of MW-like stellar discs in high-resolution cosmological simulations
Ostriker, Jeremiah P.; Buck, Tobias; Minchev, Ivan +3 more
Simulating thin and extended galactic discs has long been a challenge in computational astrophysics. We introduce the NIHAO-UHD suite of cosmological hydrodynamical simulations of Milky Way (MW) mass galaxies and study stellar disc properties such as stellar mass, size, and rotation velocity which agree well with observations of the MW and local g…
Quenching as a Contest between Galaxy Halos and Their Central Black Holes
Barro, Guillermo; Bell, Eric F.; Ferguson, Henry C. +27 more
Existing models of galaxy formation have not yet explained striking correlations between structure and star formation activity in galaxies, notably the sloped and moving boundaries that divide star-forming from quenched galaxies in key structural diagrams. This paper uses these and other relations to "reverse engineer" the quenching process for ce…