Search Publications
Inflationary freedom and cosmological neutrino constraints
de Putter, Roland; Linder, Eric V.; Mishra, Abhilash
The most stringent bounds on the absolute neutrino mass scale come from cosmological data. These bounds are made possible because massive relic neutrinos affect the expansion history of the universe and lead to a suppression of matter clustering on scales smaller than the associated free streaming length. However, the resulting effect on cosmologi…
Limits on a Gravitational Field Dependence of the Proton-Electron Mass Ratio from H2 in White Dwarf Stars
Barstow, M. A.; Bagdonaite, J.; Salumbides, E. J. +4 more
Spectra of molecular hydrogen (H2) are employed to search for a possible proton-to-electron mass ratio (µ) dependence on gravity. The Lyman transitions of H2, observed with the Hubble Space Telescope towards white dwarf stars that underwent a gravitational collapse, are compared to accurate laboratory spectra taking int…
The Atacama Cosmology Telescope: cross correlation with Planck maps
Hasselfield, Matthew; Bond, J. Richard; Devlin, Mark J. +26 more
We present the temperature power spectrum of the Cosmic Microwave Background obtained by cross-correlating maps from the Atacama Cosmology Telescope (ACT) at 148 and 218 GHz with maps from the Planck satellite at 143 and 217 GHz, in two overlapping regions covering 592 square degrees. We find excellent agreement between the two datasets at both fr…
Comprehensive analysis of glaciated martian crater Greg
Mangold, Nicolas; Forget, François; Berman, Daniel C. +2 more
The 66-km diameter martian crater, Greg, east of Hellas, hosts various distinctive features, including dendritic valleys filled with chevron-textured masses (south wall), and lobate tongues a few kilometers long (north wall). We analyze these features by various quantitative techniques to illuminate martian geologic and climatic history. Crater re…
Influence of interplanetary coronal mass ejections on the peak intensity of solar energetic particle events
Lario, D.; Karelitz, A.
We study whether the presence of coronal mass ejections (CMEs) in interplanetary space (ICMEs) affects the maximum intensity of solar energetic particle (SEP) events. We compute the maximum intensity of 175-315 keV electron and 9-15, 15-40, and 40-80 MeV proton fluxes measured during the prompt component of 147 western SEP events observed near Ear…
Glory revealed in disk-integrated photometry of Venus
Sánchez-Lavega, A.; Pérez-Hoyos, S.; García Muñoz, A.
Context. Reflected light from a spatially unresolved planet yields unique insight into the overall optical properties of the planet cover. Glories are optical phenomena caused by light that is backscattered within spherical droplets following a narrow distribution of sizes; they are well known on Earth as localised features above liquid clouds.
Feeding versus feedback in AGN from near-infrared IFU observations: the case of Mrk 766
Storchi-Bergmann, Thaisa; Riffel, Rogemar A.; Winge, Claudia +1 more
We have mapped the emission-line flux distributions and ratios as well as the gaseous kinematics of the inner 450 pc radius of the type 1 Seyfert galaxy Mrk 766 using integral field near-infrared J- and Kl-band spectra obtained with the Gemini Near Infrared Integral Field Spectrograph at a spatial resolution of 60 pc and velocity resolu…
Herschel-ATLAS/GAMA: SDSS cross-correlation induced by weak lensing
Danese, L.; González-Nuevo, J.; Scott, D. +25 more
We report a highly significant (>10σ) spatial correlation between galaxies with S350 µm ≥ 30 mJy detected in the equatorial fields of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) with estimated redshifts ≳ 1.5, and Sloan Digital Sky Survey (SDSS) or Galaxy And Mass Assembly (GAMA) galaxies at 0.2 ≤ z ≤ 0.6. …
The Solar Neighborhood. XXXI. Discovery of an Unusual Red+White Dwarf Binary at ~25 pc via Astrometry and UV Imaging
Gies, Douglas R.; Henry, Todd J.; Winters, Jennifer G. +4 more
We report the discovery of a nearby M5.0V dwarf at 24.6 pc, SCR 1848-6855, that is orbited by an unusual companion causing an astrometric perturbation of more than 200 mas. This is by far the largest perturbation found to date among more than 700 targets observed during our long-term astrometry/photometry program at the CTIO 0.9 m telescope. We pr…
Calibrating Data from the Hinode/X-Ray Telescope and Associated Uncertainties
Reeves, Katharine K.; McKenzie, David E.; Saar, Steven H. +2 more
The X-Ray Telescope (XRT) onboard the Hinode satellite, launched 23 September 2006 by the Japan Aerospace Exploration Agency (JAXA), is a joint mission of Japan, the United States, and the United Kingdom to study the solar corona. In particular, XRT was designed to study solar plasmas with temperatures between 1 and 10 MK with ≈ 1″ pixels (≈ 2″ re…