Search Publications
Hinode extreme-ultraviolet imaging spectrometer observations of a limb active region
Young, P. R.; Mason, H. E.; Del Zanna, G. +3 more
Aims: We investigate the electron density and temperature structure of a limb active region.
Methods: We have carried out a study of an active region close to the solar limb using observations from the Extreme-ultraviolet Imaging Spectrometer (EIS) and the X-ray telescope (XRT) on board Hinode. The electron density and temperature distri…
COSMOS weak-lensing constraints on modified gravity
Schrabback, T.; Tereno, I.; Semboloni, E.
The observed acceleration of the universe, explained through dark energy, could alternatively be explained through a modification of gravity that would also induce modifications in the evolution of cosmological perturbations. We use new weak lensing data from the COSMOS survey to test for deviations from general relativity (GR). The departure from…
Merging history of three bimodal clusters
Bourdin, H.; Mars, G.; Benoist, C. +5 more
We present a combined X-ray and optical analysis of three bimodal galaxy clusters selected as merging candidates at z ~ 0.1. These targets are part of MUSIC (MUlti-Wavelength Sample of Interacting Clusters), which is a general project designed to study the physics of merging clusters by means of multi-wavelength observations. Observations include …
Evidence for a current sheet forming in the wake of a coronal mass ejection from multi-viewpoint coronagraph observations
Patsourakos, S.; Vourlidas, A.
Context. Ray-like features observed by coronagraphs in the wake of coronal mass ejections (CMEs) are sometimes interpreted as the white light counterparts of current sheets (CSs) produced by the eruption. The 3D geometry of these ray-like features is largely unknown and its knowledge should clarify their association to the CS and place constraints…
Azimuthal variations of magnetic field strength and inclination on penumbral boundaries
Jurčák, J.
Aims: I try to determine the properties of the magnetic field on the inner and outer penumbral boundaries and find out if either magnetic field strength or inclination are constant there and if these plasma parameters depend on the sunspot area.
Methods: The spectropolarimetric data obtained with the Hinode satellite were analysed. Activ…
Multi-wavelength observations of the young binary system Haro 6-10: The case of misaligned discs
Wolf, S.; Henning, T.; Roccatagliata, V. +3 more
Context. We present a multi-wavelength, high-resolution observational survey of the young binary system Haro 6-10 (GV Tau, IRAS 04263+2426), which harbours one of the few known infrared companions.
Aims: The primary goal of this project is to determine the physical and geometrical properties of the circumstellar and circumbinary material in t…
Gravitational lensing and dynamics in SL2S J02140-0535: probing the mass out to large radius
Richard, J.; Cabanac, R.; Limousin, M. +3 more
Context. Studying the density profiles of galaxy groups offers an important insight into the formation and evolution of the structures in the universe, since galaxy groups bridge the gap between single galaxies and massive clusters.
Aims: We aim to probe the mass of
No quantum gravity signature from the farthest quasars
Della Valle, M.; Gilmozzi, R.; Tamburini, F. +1 more
Context. Strings and other alternative theories describing the quantum properties of space-time suggest that space-time could present a foamy structure and also that, in certain cases, quantum gravity (QG) may manifest at energies much below the Planck scale. One of the observable effects could be the degradation of the diffraction images of dista…
X-ray spectroscopy of MXB 1728-34 with XMM-Newton
Robba, N. R.; Dauser, T.; Wilms, J. +8 more
We analyzed an XMM-Newton observation of the low-mass X-ray binary and atoll source MXB 1728-34. The source was in a low-luminosity state during the XMM-Newton observation, corresponding to a bolometric X-ray luminosity of 5 × 1036 d5.1 kpc2 erg s-1. The 1-11 keV X-ray spectrum of the source, obtained co…
The low-mass initial mass function in the Orion nebula cluster based on HST/NICMOS III imaging
Robberto, M.; Andersen, M.; Meyer, M. R. +2 more
We present deep HST/NICMOS Camera 3 F110W and F160W imaging of a 26' × 33', corresponding to 3.1 pc × 3.8 pc, non-contiguous field towards the Orion nebula cluster (ONC). The main aim is to determine the ratio of low-mass stars to brown dwarfs for the cluster as a function of radius out to a radial distance of 1.5 pc. The sensitivity of the data o…