Search Publications
Missions
Journals
Publication Years
Low Frequency Waves at and Upstream of Collisionless Shocks
Wilson, L. B.
This chapter focuses on the range of low frequency electromagnetic modes observed at and upstream of collisionless shocks in the heliosphere. It discusses a specific class of whistler mode wave observed immediately upstream of collisionless shock ramps, called a whistler precursor. Though these modes have been (and are often) observed upstream of …
How the dark energy can reconcile Planck with local determination of the Hubble constant
Huang, Qing-Guo; Wang, Ke
We try to reconcile the tension between the local 2.4 % determination of Hubble constant and its global determination by Planck CMB data and BAO data through modeling the dark energy variously. We find that the chi-square is significantly reduced by
The Lyman continuum escape fraction of galaxies at z = 3.3 in the VUDS-LBC/COSMOS field
Maccagni, D.; Cimatti, A.; Ilbert, O. +52 more
Context. The ionizing Lyman continuum flux escaping from high-redshift galaxies into the intergalactic medium is a fundamental quantity to understand the physical processes involved in the reionization epoch. However, from an observational point of view, direct detections of HI ionizing photons at high redshifts are feasible for galaxies mainly in…
Predicting Coronal Mass Ejections Using Machine Learning Methods
Ilonidis, S.; Bobra, M. G.
Of all the activity observed on the Sun, two of the most energetic events are flares and coronal mass ejections (CMEs). Usually, solar active regions that produce large flares will also produce a CME, but this is not always true. Despite advances in numerical modeling, it is still unclear which circumstances will produce a CME. Therefore, it is wo…
A massive, quiescent, population II galaxy at a redshift of 2.1
Siana, Brian; van Dokkum, Pieter G.; Choi, Jieun +7 more
Unlike spiral galaxies such as the Milky Way, the majority of the stars in massive elliptical galaxies were formed in a short period early in the history of the Universe. The duration of this formation period can be measured using the ratio of magnesium to iron abundance ([Mg/Fe]) in spectra, which reflects the relative enrichment by core-collapse…
Compressive Coherent Structures at Ion Scales in the Slow Solar Wind
Maksimovic, M.; Alexandrova, O.; Kasper, J. C. +5 more
We present a study of magnetic field fluctuations in a slow solar wind stream, close to ion scales, where an increase of the level of magnetic compressibility is observed. Here, the nature of these compressive fluctuations is found to be characterized by coherent structures. Although previous studies have shown that current sheets can be considere…
Global seismology of the Sun
Basu, Sarbani
The seismic study of the Sun and other stars offers a unique window into the interior of these stars. Thanks to helioseismology, we know the structure of the Sun to admirable precision. In fact, our knowledge is good enough to use the Sun as a laboratory. We have also been able to study the dynamics of the Sun in great detail. Helioseismic data al…
The Most Luminous Heavily Obscured Quasars Have a High Merger Fraction: Morphological Study of WISE-selected Hot Dust-obscured Galaxies
Fang, Guanwen; Yang, Jun; Fan, Lulu +6 more
Previous studies have shown that Wide-field Infrared Survey Explorer-selected hyperluminous, hot dust-obscured galaxies (Hot DOGs) are powered by highly dust-obscured, possibly Compton-thick active galactic nuclei (AGNs). High obscuration provides us a good chance to study the host morphology of the most luminous AGNs directly. We analyze the host…
MUSE crowded field 3D spectroscopy of over 12 000 stars in the globular cluster NGC 6397. I. The first comprehensive HRD of a globular cluster
Bacon, Roland; Brinchmann, Jarle; Weilbacher, Peter M. +8 more
Aims: We demonstrate the high multiplex advantage of crowded field 3D spectroscopy with the new integral field spectrograph MUSE by means of a spectroscopic analysis of more than 12 000 individual stars in the globular cluster NGC 6397.
Methods: The stars are deblended with a point spread function fitting technique, using a photometric r…
The XXL Survey. XIII. Baryon content of the bright cluster sample
Smith, G. P.; Chiappetti, L.; Paltani, S. +20 more
Traditionally, galaxy clusters have been expected to retain all the material accreted since their formation epoch. For this reason, their matter content should be representative of the Universe as a whole, and thus their baryon fraction should be close to the Universal baryon fraction Ωb/ Ωm. We make use of the sample of the …