Cosmology constraints from shear peak statistics in Dark Energy Survey Science Verification data
T Kacprzak, D Kirk, O Friedrich, A Amara…�- Monthly Notices of�…, 2016 - academic.oup.com
Shear peak statistics has gained a lot of attention recently as a practical alternative to the
two-point statistics for constraining cosmological parameters. We perform a shear peak
statistics analysis of the Dark Energy Survey (DES) Science Verification (SV) data, using
weak gravitational lensing measurements from a 139 deg2 field. We measure the
abundance of peaks identified in aperture mass maps, as a function of their signal-to-noise
ratio, in the signal-to-noise range. To predict the peak counts as a function of cosmological�…
two-point statistics for constraining cosmological parameters. We perform a shear peak
statistics analysis of the Dark Energy Survey (DES) Science Verification (SV) data, using
weak gravitational lensing measurements from a 139 deg2 field. We measure the
abundance of peaks identified in aperture mass maps, as a function of their signal-to-noise
ratio, in the signal-to-noise range. To predict the peak counts as a function of cosmological�…
A study of the circumgalactic medium at z∼ 0.6 using damped Lyman α galaxies
H Rahmani, C P�roux, DA Turnshek…�- Monthly Notices of�…, 2016 - academic.oup.com
We present the study of a sample of nine quasi-stellar object fields, with damped Lyman α
(DLA) or sub-DLA systems at z∼ 0.6, observed with the X-Shooter spectrograph at the Very
Large Telescope. By suitably positioning the X-Shooter slit based on high spatial resolution
images of Hubble Space Telescope/Advanced Camera for Surveys we are able to detect
absorbing galaxies in seven out of nine fields (∼ 78 per cent success rate) at impact
parameters from 10 to 30 kpc. In five out of seven fields the absorbing galaxies are�…
(DLA) or sub-DLA systems at z∼ 0.6, observed with the X-Shooter spectrograph at the Very
Large Telescope. By suitably positioning the X-Shooter slit based on high spatial resolution
images of Hubble Space Telescope/Advanced Camera for Surveys we are able to detect
absorbing galaxies in seven out of nine fields (∼ 78 per cent success rate) at impact
parameters from 10 to 30 kpc. In five out of seven fields the absorbing galaxies are�…
Properties of the first-order Fermi acceleration in fast magnetic reconnection driven by turbulence in collisional magnetohydrodynamical flows
MV del Valle, EM de Gouveia Dal Pino…�- Monthly Notices of the�…, 2016 - academic.oup.com
Fast magnetic reconnection can occur in different astrophysical sources, producing flare-like
emission and particle acceleration. Currently, this process is being studied as an efficient
mechanism to accelerate particles via a first-order Fermi process. In this paper, we analyse
the acceleration rate and the energy distribution of test particles injected into three-
dimensional magnetohydrodynamical (MHD) domains with large-scale current sheets where
reconnection is made fast by the presence of turbulence. We study the dependence of the�…
emission and particle acceleration. Currently, this process is being studied as an efficient
mechanism to accelerate particles via a first-order Fermi process. In this paper, we analyse
the acceleration rate and the energy distribution of test particles injected into three-
dimensional magnetohydrodynamical (MHD) domains with large-scale current sheets where
reconnection is made fast by the presence of turbulence. We study the dependence of the�…