Search Publications
Coupling Between Whistler Waves and Ion-Scale Solitary Waves: Cluster Measurements in the Magnetotail During a Substorm
Le Contel, O.; Cornilleau-Wehrlin, N.; Tenerani, A. +4 more
We present a new model of self-consistent coupling between low frequency, ion-scale coherent structures with high frequency whistler waves in order to interpret Cluster data. The idea relies on the possibility of trapping whistler waves by inhomogeneous external fields where they can be spatially confined and propagate for times much longer than t…
γ-rays from anisotropic inverse Compton e± pair cascades in microquasars: application to Cyg X-3
Bednarek, W.; Sitarek, J.
Microquasars are expected to emit high-energy γ-rays owing to their general similarities to γ-ray-emitting blazars (evidence of relativistic jets, non-thermal radio to X-ray emission). In fact, the first source of this type, Cyg X-3, has recently been unambiguously discovered by satellite telescopes. We study the features of the γ-ray radiation pr…
Spatial correlation of OH Meinel and O 2 infrared atmospheric nightglow emissions observed with VIRTIS-M on board Venus Express
Drossart, P.; Piccioni, G.; Gérard, J. -C. +1 more
We present the two-dimensional distribution of the O 2 a 1Δ-X 3Σ (0-0) band at 1.27 µm and the OH Δ v = 1 Meinel airglow measured simultaneously with the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on board Venus Express. We show that the two emissions present very similar spatial structures. A…
Building the cosmic distance scale: from Hipparcos to Gaia
Turon, Catherine; Luri, Xavier; Masana, Eduard
Hipparcos, the first ever experiment of global astrometry, was launched by ESA (European Space Agency) in 1989 and its results published in 1997 (Perryman et al. in Astron. Astrophys. 323:L49, 1997; Perryman & ESA (eds.) in The Hipparcos and Tycho catalogues, ESA SP-1200, 1997). A new reduction was later performed using an improved satellite a…
Identifying a new intermediate polar using XMM-Newton and INTEGRAL
Ramsay, Gavin; Wheatley, Peter J.; Middleton, Matthew J. +3 more
The bright X-ray source 2XMMi J180438.7-145647 is fortunate to have long baseline observations in INTEGRAL that complement observations taken by other missions. Optical spectroscopy of this object has suggested a distance of ∼7 kpc and an identification with a low-mass X-ray binary. We instead use the X-ray data from 0.3 to 40 keV to identify the …
Variations of the Muon Flux at Sea Level Associated with Interplanetary ICMEs and Corotating Interaction Regions
Miranda, P.; Ticona, R.; Velarde, A. +9 more
We present the results of an ongoing survey on the association between the muon flux variation at ground level (3 m above sea level) registered by the Tupi telescopes (Niteri-Brazil, 22fdg9S, 43fdg2W, 3 m) and the Earth-directed transient disturbances in the interplanetary medium propagating from the Sun (such as coronal mass ejections (CME), and …
Extended X-ray emission from non-thermal sources in the COSMOS field: a detailed study of a large radio galaxy at z= 1.168
Schinnerer, Eva; Koekemoer, Anton; Finoguenov, Alexis +5 more
X-ray selected galaxy group samples are usually generated by searching for extended X-ray sources that reflect the thermal radiation of the intragroup medium. On the other hand, large radio galaxies that regularly occupy galaxy groups also emit in the X-ray window, and their contribution to X-ray selected group samples is still not well understood…
Debris disks as seen by Herschel/DUNES
Magain, P.; Krivov, A. V.; Eiroa, C. +18 more
The far-infrared excesses produced by debris disks are common features of stellar systems. These disks are thought to contain solids ranging from micron-sized dust to planetesimals. Naturally, their formation and evolution are linked to those of potential planets. With this motivation, the Herschel open time key programme DUNES (DUst around NEarby…
H α counterparts of X-ray bright points in the solar atmosphere
Zhang, Ping; Fang, Cheng; Zhang, QingMin
X-ray bright points (XBPs) are small-scale brightenings in the solar corona. Their counterparts in the lower atmosphere, however, are poorly investigated. In this paper, we study the counterparts of XBPs in the upper chromosphere where the Hα line center is formed. The XBPs were observed by the X-ray Telescope (XRT) aboard the Hinode spacecraft du…
Latitudinal distribution of HDO abundance above Venus' clouds by ground-based 2.3 µm spectroscopy
Matsui, H.; Iwagami, N.; Hosouchi, M. +2 more
The abundance of HDO above the clouds in the dayside atmosphere of Venus was measured by ground-based 2.3 µm spectroscopy over 4 days. This is the first HDO observation above the clouds in this wavelength region corresponding to a new height region. The latitudinal distributions found show no clearly defined structure. The disk-averaged mixi…