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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…
Vortices in Saturn's Northern Hemisphere (2008-2015) observed by Cassini ISS
West, Robert A.; Porco, Carolyn C.; Baines, Kevin H. +12 more
We use observations from the Imaging Science Subsystem on Cassini to create maps of Saturn's Northern Hemisphere (NH) from 2008 to 2015, a time period including a seasonal transition (i.e., spring equinox in 2009) and the 2010 giant storm. The processed maps are used to investigate vortices in the NH during the period of 2008-2015. All recorded vo…
Quasi periodic oscillations in active galactic nuclei
Kara, E.; Fabian, A.; Middleton, M. +3 more
Quasi-periodic oscillations (QPOs) are coherent peaks of variability power observed in the X-ray power spectra (PSDs) of stellar mass X-ray binaries (XRBs). A scale invariance of the accretion process implies they should be present in the active galactic nuclei. The first robust detection was a ∼ 1 h periodicity in the Seyfert galaxy RE J1034+396 …
Lifecycle of a large-scale polar coronal pseudostreamer/cavity system
Auchère, Frédéric; Rachmeler, Laurel; Seaton, Daniel +1 more
We report on an exceptional large-scale coronal pseudostreamer/cavity system in the southern polar region of the solar corona that was visible for approximately a year starting in February 2014. It is unusual to see such a large closed-field structure embedded within the open polar coronal hole. We investigate this structure to document its format…
The H I supershell GS 118+01-44 and its role in the interstellar medium
Noriega-Crespo, A.; Cichowolski, S.; Arnal, E. M. +3 more
Aims: We carry out a multiwavelength study to characterize the H I supershell designated GS 118+01-44, and to analyse its possible origin.
Methods: A multiwavelength study has been carried out to study the supershell and its environs. We performed an analysis of the H I, CO, radio continuum, and infrared emission distributions.
Resu…
Physical properties of Galactic Planck cold cores revealed by the Hi-GAL survey
Testi, L.; Molinari, S.; Zahorecz, S. +3 more
Context. Previous studies of the initial conditions of massive star and star cluster formation have mainly targeted infrared-dark clouds (or IRDCs) toward the inner Galaxy. This is because IRDCs were first detected in absorption against the bright mid-infrared (IR) background of the inner Galaxy, requiring a favorable location to be observed. By s…
Van Allen Probes, THEMIS, GOES, and Cluster observations of EMIC waves, ULF pulsations, and an electron flux dropout
Green, J. C.; Santolík, O.; Carr, C. +9 more
We examined an electron flux dropout during the 12-14 November 2012 geomagnetic storm using observations from seven spacecraft: the two Van Allen Probes, Time History of Events and Macroscale Interactions during Substorms (THEMIS)-A (P5), Cluster 2, and Geostationary Operational Environmental Satellites (GOES) 13, 14, and 15. The electron fluxes f…