Search Publications
Plasma density structures at comet 67P/Churyumov-Gerasimenko
Nilsson, H.; Goetz, C.; Henri, P. +7 more
We present a Rosetta Plasma Consortium (RPC) case study based on four events in 2015 autumn at various radial distances, phase angles and local times, just after the perihelion of comet 67P/Churyumov-Gerasimenko. Pulse-like (high-amplitude, up to minutes in time) signatures are seen with several RPC instruments in the plasma density (with the LAng…
The impact of ELT distortions and instabilities on future astrometric observations
Massari, D.; Rodeghiero, G.; Pott, J. -U. +4 more
The paper discusses an assessment study about the impact of the distortions on the astrometric observations with the Extremely Large Telescope originated from the optics positioning errors and telescope instabilities. Optical simulations combined with Monte Carlo approach reproducing typical inferred opto-mechanical and dynamical instabilities sho…
Evolution of the UV upturn in cluster galaxies: Abell 1689
Bremer, M. N.; De Propris, R.; Phillipps, S. +1 more
We have measured the strength of the UV upturn for red sequence galaxies in the Abell 1689 cluster at z = 0.18, reaching to or below the L* level and therefore probing the general evolution of the upturn phenomenon. We find that the range of UV upturn strengths in the population as a whole has not declined over the past 2.2 Gyr. This is consistent…
A VLT/MUSE galaxy survey towards QSO Q1410: looking for a WHIM traced by BLAs in inter-cluster filaments
Prochaska, J. Xavier; Tejos, Nicolas; Barrientos, L. Felipe +7 more
Cosmological simulations predict that a significant fraction of the low-z baryon budget resides in large-scale filaments in the form of a diffuse plasma at temperatures T ∼ 105 - 107 K. However, direct observation of this so-called warm-hot intergalactic medium (WHIM) has been elusive. In the Λcold dark matter paradigm, galax…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - XIII. ACS/WFC parallel-field catalogues
Anderson, J.; Milone, A. P.; Bedin, L. R. +12 more
As part of the Hubble Space Telescope UV Legacy Survey of Galactic globular clusters, 110 parallel fields were observed with the Wide Field Channel of the Advanced Camera for Surveys, in the outskirts of 48 globular clusters, plus the open cluster NGC 6791. Totalling about 0.3 deg2 of observed sky, this is the largest homogeneous Hubble…
Spectroscopic orbits of nearby solar-type dwarfs - II.
Tokovinin, A.; Gorynya, N. A.
Several nearby solar-type dwarfs with variable radial velocity were monitored to find their spectroscopic orbits. First orbital elements of 15 binaries (HIP 12144, 17895, 27970, 32329, 38636, 39072, 40479, 43004, 73700, 79234, 84696, 92140, 88656, 104514, and 112222) are determined. The previously known orbits of HIP 5276, 21443, 28678, and 41214 …
On the detection of CO and mass-loss of bulge OH/IR stars
Blommaert, J. A. D. L.; Justtanont, K.; Decin, L. +1 more
We report on the successful search for CO (2-1) and (3-2) emission associated with OH/IR stars in the Galactic bulge. We observed a sample of eight extremely red asymptotic giant branch stars with the Atacama Pathfinder EXperiment telescope and detected seven. The sources were selected at a sufficiently high galactic latitude to avoid interference…
Broad absorption line symbiotic stars: highly ionized species in the fast outflow from MWC 560
Sokoloski, J. L.; Knigge, Christian; Lucy, Adrian B.
In symbiotic binaries, jets and disc winds may be integral to the physics of accretion on to white dwarfs from cool giants. The persistent outflow from symbiotic star MWC 560 (≡V694 Mon) is known to manifest as broad absorption lines (BALs), most prominently at the Balmer transitions. We report the detection of high-ionization BALs from C IV, Si I…
Constraining the nature of DG Tau A's thermal and non-thermal radio emission
Purser, S. J. D.; Ray, T. P.; Taylor, A. M. +3 more
DG Tau A, a class-II young stellar object (YSO), displays both thermal and non-thermal radio emission associated with its bipolar jet. To investigate the nature of this emission, we present sensitive (σ ∼ 2 {µ Jy} beam^{-1}), Karl G. Jansky Very Large Array (VLA) 6 and 10 GHz observations. Over 3.81 yr, no proper motion is observed towards t…
IGR J19294+1816: a new Be-X-ray binary revealed through infrared spectroscopy
Solano, E.; Torrejón, J. M.; Rodes-Roca, J. J. +2 more
The aim of this work is to characterize the counterpart to the INTErnational Gamma-Ray Astrophysics Laboratory high-mass X-ray binary candidate IGR J19294+1816 so as to establish its true nature. We obtained H-band spectra of the selected counterpart acquired with the Near Infrared Camera and Spectrograph instrument mounted on the Telescopio Nazio…