Search Publications
Classification and environmental properties of X-ray selected point-like sources in the XMM-LSS field
Chiappetti, L.; Salvato, M.; Pierre, M. +8 more
Context. The XMM-Large Scale Structure survey, covering an area of 11.1 sq. deg., contains more than 6000 X-ray point-like sources detected with the XMM-Newton to a flux of 3 × 10-15 erg s-1 cm-2 in the [0.5-2] keV band. The vast majority of these sources have optical (CFHTLS), infrared (SWIRE IRAC and MIPS), near-…
HST FUV C iv observations of the hot DG Tauri jet
Schmitt, J. H. M. M.; Güdel, M.; Eislöffel, J. +4 more
Protostellar jets are tightly connected to the accretion process and regulate the angular momentum balance of accreting star-disk systems. The DG Tau jet is one of the best-studied protostellar jets and contains plasma with temperatures ranging over three orders of magnitude within the innermost 50 AU of the jet. We present new Hubble Space Telesc…
Planck constraints on the effective neutrino number and the CMB power spectrum lensing amplitude
Di Valentino, Eleonora; Gerbino, Martina; Said, Najla
We present new constraints on the relativistic neutrino effective number Neff and on the cosmic microwave background power spectrum lensing amplitude AL from the recent Planck 2013 data release. Including observations of the cosmic microwave background large angular scale polarization from the Wilkinson microwave anisotropy p…
A statistical study of proton precipitation onto the Martian upper atmosphere: Mars Express observations
Barabash, S.; Nilsson, H.; Stenberg, G. +1 more
Due to the small size of the Martian magnetic pile-up region, especially at the subsolar point, heated protons with high enough energy can penetrate the induced magnetosphere boundary without being backscattered, i.e., they precipitate. We present a statistical study of the downgoing ~ keV proton fluxes measured in the Martian ionosphere by the An…
Warming up for Planck
Rosa, João G.; Bartrum, Sam; Berera, Arjun
The recent Planck results and future releases on the horizon present a key opportunity to address a fundamental question in inflationary cosmology of whether primordial density perturbations have a quantum or thermal origin, i.e. whether particle production may have significant effects during inflation. Warm inflation provides a natural arena to a…
Fast Extreme-ultraviolet Dimming Associated with a Coronal Jet Seen in Multi-wavelength and Stereoscopic Observations
Moon, Y. -J.; Innes, D. E.; Shibata, K. +3 more
We have investigated a coronal jet observed near the limb on 2010 June 27 by the Hinode/X-Ray Telescope (XRT), EUV Imaging Spectrograph (EIS), and Solar Optical Telescope (SOT), and by the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), and on the disk by STEREO-A/EUVI. From EUV (AIA and EIS) and soft X-ray (XRT) images we hav…
Polycyclic Aromatic Hydrocarbon Emission in the Proplyd HST10: What is the Mechanism behind Photoevaporation?
Kamp, I.; Carmona, A.; Pantin, E. +4 more
Proplyds are photodissociation-region-(PDR)-like cometary cocoons around young stars which are thought to originate through photoevaporation of the central protoplanetary disk by external UV radiation from the nearby OB stars. This Letter presents spatially resolved mid-infrared imaging and spectroscopy of the proplyd HST10 obtained with the Very …
Ultraviolet Observations of the Globular Cluster M10 from HST and GALEX: The BSS Population
O'Connell, R. W.; Dalessandro, E.; Beccari, G. +3 more
We present a combination of high-resolution Hubble Space Telescope and wide-field ground-based and Galaxy Evolution Explorer data of the Galactic globular cluster M10 (NGC 6254). By using this large data set, we determined the center of gravity of the cluster and we built its density profile from star counts over its entire radial extension. We fi…
Using Statistical Multivariable Models to Understand the Relationship Between Interplanetary Coronal Mass Ejecta and Magnetic Flux Ropes
Riley, P.; Richardson, I. G.
In-situ measurements of interplanetary coronal mass ejections (ICMEs) display a wide range of properties. A distinct subset, "magnetic clouds" (MCs), are readily identifiable by a smooth rotation in an enhanced magnetic field, together with an unusually low solar wind proton temperature. In this study, we analyze Ulysses spacecraft measurements to…
Asymmetries in Coronal Spectral Lines and Emission Measure Distribution
Tripathi, Durgesh; Klimchuk, James A.
It has previously been argued that (1) spicules do not provide enough pre-heated plasma to fill the corona, and (2) even if they did, additional heating would be required to keep the plasma hot as it expands upward. Here we address whether spicules play an important role by injecting plasma at cooler temperatures (<2 MK), which then gets heated…