Search Publications
MUSE observations of the lensing cluster Abell 1689
Bina, D.; Pelló, R.; Richard, J. +14 more
Context. This paper presents the results obtained with the Multi Unit Spectroscopic Explorer (MUSE) for the core of the lensing cluster Abell 1689, as part of MUSE's commissioning at the ESO Very Large Telescope.
Aims: Integral-field observations with MUSE provide a unique view of the central 1 × 1 arcmin2 region at intermediate sp…
Martian ionosphere observed by Mars Express. 1. Influence of the crustal magnetic fields
Dubinin, E.; Fraenz, M.; Andrews, D. +1 more
The Bullet cluster at its best: weighing stars, gas, and dark matter
Kneib, J. -P.; Jullo, E.; Richard, J. +4 more
Aims: We present a new strong lensing mass reconstruction of the Bullet cluster (1E 0657-56) at z = 0.296, based on WFC3 and ACS HST imaging and VLT/FORS2 spectroscopy. The strong lensing constraints underwent substantial revision compared to previously published analysis, there are now 14 (six new and eight previously known) multiply-imaged …
A lucky imaging multiplicity study of exoplanet host stars - II
Avenhaus, H.; Ginski, C.; Mugrauer, M. +6 more
The vast majority of extrasolar planets are detected by indirect detection methods such as transit monitoring and radial velocity measurements. While these methods are very successful in detecting short-periodic planets, they are mostly blind to wide sub-stellar or even stellar companions on long orbits. In our study, we present high-resolution im…
Chemical abundances in the multiple sub-giant branch of 47 Tucanae: insights on its faint sub-giant branch component
Milone, A. P.; Marino, A. F.; Bedin, L. R. +8 more
The globular cluster 47 Tuc exhibits a complex sub-giant branch (SGB) with a faint-SGB comprising only about the 10 per cent of the cluster mass and a bright-SGB hosting at least two distinct populations. We present a spectroscopic analysis of 62 SGB stars including 21 faint-SGB stars. We thus provide the first chemical analysis of the intriguing …
The 80 Ms follow-up of the X-ray afterglow of GRB 130427A challenges the standard forward shock model
Troja, E.; Piro, L.; Page, M. J. +12 more
GRB 130427A was the brightest gamma-ray burst detected in the last 30 yr. With an equivalent isotropic energy output of 8.5 × 1053 erg and redshift z = 0.34, it uniquely combined very high energetics with a relative proximity to Earth. As a consequence, its X-ray afterglow has been detected by sensitive X-ray observatories such as XMM-N…
Discovery of an Inner Disk Component around HD 141569 A
Stark, Christopher C.; Weinberger, Alycia J.; Nesvold, Erika R. +20 more
We report the discovery of a scattering component around the HD 141569 A circumstellar debris system, interior to the previously known inner ring. The discovered inner disk component, obtained in broadband optical light with Hubble Space Telescope/Space Telescope Imaging Spectrograph coronagraphy, was imaged with an inner working angle of 0.″25, a…
A statistical study of plasmaspheric plumes and ionospheric outflows observed at the dayside magnetopause
Zhang, H.; Zong, Q. -G.; Rème, H. +3 more
We present a statistical study of plasmaspheric plumes and ionospheric outflows observed by the Cluster spacecraft near the dayside magnetopause. Plasmaspheric plumes are identified when the low-energy ions (<1 keV) with ∼90° pitch angle distributions are observed by the Cluster Ion Spectrometer/Hot Ion Analyzer instrument. The ionospheric outf…
The mass of the black hole in RE J1034+396
Hryniewicz, K.; Życki, P. T.; Czerny, B. +7 more
Context. The black hole mass measurement in active galaxies is a challenge, particularly in sources where the reverberation method cannot be applied.
Aims: We aim to determine the black hole mass in a very special object, RE J1034+396, one of the two active galactic nuclei (AGN) with quasi-periodic oscillations detected in X-rays, and a singl…
The Mysterious Case of the Solar Argon Abundance near Sunspots in Flares
Doschek, G. A.; Warren, H. P.
Recently we discussed an enhancement of the abundance of Ar xiv relative to Ca xiv near a sunspot during a flare, observed in spectra recorded by the Extreme-ultraviolet Imaging Spectrometer (EIS) on the Hinode spacecraft. The observed Ar xiv/Ca xiv ratio yields an argon/calcium abundance ratio seven times greater than expected from the photospher…