Search Publications
The HST view of the innermost narrow line region
Marconi, Alessandro; Capetti, Alessandro; Baldi, Ranieri D. +2 more
We analyze the properties of the innermost narrow line region in a sample of low-luminosity AGN. We select 33 LINERs (bona fide AGN) and Seyfert galaxies from the optical spectroscopic Palomar survey observed by HST/STIS. We find that in LINERs the [ N II ] and [ O I ] lines are broader than the [ S II ] line and that the [ N II ] /[ S II ] flux r…
A sequence of flux transfer events potentially generated by different generation mechanisms
Fazakerley, A. N.; Fear, R. C.; Trattner, K. J. +2 more
Flux transfer events (FTEs) are magnetic structures generated by time-varying reconnection at the dayside magnetopause. Understanding their generation mechanism is important, because it is necessary in order to understand the global contribution of FTEs to the convection process. We present observations of several FTEs sequentially observed by Clu…
Kinetic models of sub-ion cylindrical magnetic hole
Artemyev, A. V.; Vasko, I. Y.; Yushkov, E. V. +1 more
Magnetic holes are magnetoplasma structures very similar to the classical θ-pinch. They are widely observed in the space plasma and identified by the substantial magnetic field depressions on scales from magnetohydrodynamic range to electron scales. In this paper, we develop the kinetic models of cylindrically symmetric magnetic holes with sub-ion…
Rosetta science operations in support of the Philae mission
Altobelli, Nicolas; Almeida, Miguel; Martin, Patrick +16 more
The international Rosetta mission was launched on 2nd March 2004 and after its ten year journey, arrived at its target destination of comet 67P/Churyumov-Gerasimenko, during 2014. Following the January 2014 exit from a two and half year hibernation period, Rosetta approached and arrived at the comet in August 2014. In November 2014, the Philae lan…
Electrical conductivity of the dusty plasma in the Enceladus plume
Yaroshenko, V. V.; Lühr, H.
The plasma conductivity is an important issue for understanding the magnetic field structure registered by Cassini in the Enceladus proximity. We have revise the conductivity mechanism to incorporate the plume nanograins as a new plasma species and take into account the relevant collisional processes including those accounting for the momentum exc…
Far-infrared and sub-millimetre imaging of HD 76582's circumstellar disc
Matthews, Brenda C.; Booth, Mark; Zuckerman, Ben +3 more
Debris discs, the tenuous rocky and icy remnants of planet formation, are believed to be evidence for planetary systems around other stars. The JCMT/SCUBA-2 debris disc legacy survey `SCUBA-2 Observations of Nearby Stars' (SONS) observed 100 nearby stars, amongst them HD 76582, for evidence of such material. Here, we present imaging observations b…
X-ray observations of a subhalo associated with the NGC 4839 group infalling toward the Coma cluster
Sato, Kosuke; Okabe, Nobuhiro; Matsushita, Kyoko +1 more
We report on Suzaku X-ray observations of the dark subhalo associated with the merging group of NGC 4839 in the Coma cluster. The X-ray image exhibits an elongated tail toward the southwest. The X-ray peak shifts approximately 1' away from the weak-lensing mass center toward the opposite direction of the Coma cluster center. We investigated the te…
Probing Saturn's tropospheric cloud with Cassini/VIMS
Fletcher, L. N.; Irwin, P. G. J.; Giles, R. S. +2 more
In its decade of operation the Cassini mission has allowed us to look deep into Saturn's atmosphere and investigate the processes occurring below its enshrouding haze. We use Visual and Infrared Mapping Spectrometer (VIMS) 4.6-5.2 µm data from early in the mission to investigate the location and properties of Saturn's cloud structure between…
Rosetta following a living comet
Ferri, Paolo; Accomazzo, Andrea; Hubault, Armelle +7 more
The International Rosetta Mission was launched on 2nd March 2004 on its 10 year journey to rendezvous with comet 67P Churyumov-Gerasimenko. Rosetta performed comet orbit insertion on the 6th of August 2014, after which it characterised the nucleus and orbited it at altitudes as low as a few kilometres. In November 2014 Rosetta delivered the lander…
Searching for molecular outflows in hyperluminous infrared galaxies
Sturm, E.; Veilleux, S.; Bauer, F. E. +5 more
We present constraints on the molecular outflows in a sample of five hyperluminous infrared galaxies using Herschel observations of the OH doublet at 119 µm. We have detected the OH doublet in three cases: one purely in emission and two purely in absorption. The observed emission profile has a significant blueshifted wing suggesting the poss…