Search Publications
Changing the Bayesian prior: Absolute neutrino mass constraints in nonlocal gravity*
Dirian, Yves
Prior change is discussed in observational constraints studies of nonlocally modified gravity, where a model characterized by a modification of the form ∼m2R □-2R to the Einstein-Hilbert action was compared against the base Λ CDM one in a Bayesian way. It was found that the competing modified gravity model is significantly di…
Characterization of the Inner Disk around HD 141569 A from Keck/NIRC2 L-Band Vortex Coronagraphy
Matthews, Keith; Milli, Julien; Pinte, Christophe +22 more
HD 141569 A is a pre-main sequence B9.5 Ve star surrounded by a prominent and complex circumstellar disk, likely still in a transition stage from protoplanetary to debris disk phase. Here, we present a new image of the third inner disk component of HD 141569 A made in the L‧ band (3.8 µm) during the commissioning of the vector vortex coronag…
Gravitationally lensed quasars in Gaia: I. Resolving small-separation lenses
McMahon, Richard G.; Auger, Matthew W.; Koposov, Sergey E. +1 more
Gaia's exceptional resolution (FWHM ∼ 0.1 arcsec) allows identification and cataloguing of the multiple images of gravitationally lensed quasars. We investigate a sample of 49 known lensed quasars in the Sloan Digital Sky Survey (SDSS) footprint, with image separations less than 2 arcsec, and find that eight are detected with multiple components i…
New constraints on the disk characteristics and companion candidates around T Chamaeleontis with VLT/SPHERE
Pinte, C.; Ménard, F.; Ginski, C. +34 more
Context. The transition disk around the T Tauri star T Cha possesses a large gap, making it a prime target for high-resolution imaging in the context of planet formation.
Aims: We aim to find signs of disk evolutionary processes by studying the disk geometry and the dust grain properties at its surface, and to search for companion candidates.…
New Evidence for a Coronal Mass Ejection-driven High Frequency Type II Burst near the Sun
Kumari, Anshu; Ramesh, R.; Kathiravan, C. +1 more
We report observations of the high frequency type II radio burst (≈430-30 MHz) that occurred in the solar corona on 2015 November 4. The drift rate of the burst, estimated close to the start frequency of its fundamental component (≈215 MHz), is unusually high (≈2 MHz s-1). Our analysis shows that the estimated speed of the magnetohydrod…
The SLUGGS Survey: A Catalog of Over 4000 Globular Cluster Radial Velocities in 27 Nearby Early-type Galaxies
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +10 more
Here, we present positions and radial velocities for over 4000 globular clusters (GCs) in 27 nearby early-type galaxies from the SLUGGS survey. The SLUGGS survey is designed to be representative of elliptical and lenticular galaxies in the stellar mass range 10 < log {M}* /M ⊙ < 11.7. The data have been obtained over ma…
Blowout jets and impulsive eruptive flares in a bald-patch topology
Srivastava, A. K.; Mandrini, C. H.; Schmieder, B. +7 more
Context. A subclass of broad extreme ultraviolet (EUV) and X-ray jets, called blowout jets, have become a topic of research since they could be the link between standard collimated jets and coronal mass ejections (CMEs).
Aims: Our aim is to understand the origin of a series of broad jets, some of which are accompanied by flares and associated…
Turbulent Transport in a Three-dimensional Solar Wind
Bruno, R.; Zank, G. P.; Shiota, D. +3 more
Turbulence in the solar wind can play essential roles in the heating of coronal and solar wind plasma and the acceleration of the solar wind and energetic particles. Turbulence sources are not well understood and thought to be partly enhanced by interaction with the large-scale inhomogeneity of the solar wind and the interplanetary magnetic field …
A High Space Density of Luminous Lyman Alpha Emitters at z ∼ 6.5
Bagley, Micaela B.; Martin, Crystal L.; Garel, Thibault +16 more
We present the results of a systematic search for Lyα emitters (LAEs) at 6≲ z≲ 7.6 using the HST WFC3 Infrared Spectroscopic Parallel (WISP) Survey. Our total volume over this redshift range is ∼ 8× {10}5 Mpc3, comparable to many of the narrowband surveys despite their larger area coverage. We find two LAEs at z = 6.38 and 6.…
EGG: hatching a mock Universe from empirical prescriptions⋆
Elbaz, D.; Ferguson, H. C.; Okumura, K. +14 more
This paper introduces EGG, the Empirical Galaxy Generator, a tool designed within the ASTRODEEP collaboration to generate mock galaxy catalogs for deep fields with realistic fluxes and simple morphologies. The simulation procedure is based exclusively on empirical prescriptions - rather than first principles - to provide the most accurate match wi…