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Elusive AGN in the XMM-Newton bright serendipitous survey
Page, M. J.; Carrera, F. J.; Caccianiga, A. +3 more
Context: Optical follow-up of X-ray selected sources finds a significant fraction of “optically dull” sources characterized by optical spectra without obvious signature of AGN activity. In many cases, however, the presence of an AGN is inferred from other diagnostics (e.g. the X-ray properties). Understanding and accounting for this “elusiveness” …
Interstellar Dust in the Solar System
Altobelli, Nicolas; Krüger, Harald; Grün, Eberhard +1 more
The Ulysses spacecraft has been orbiting the Sun on a highly inclined ellipse almost perpendicular to the ecliptic plane (inclination 79°, perihelion distance 1.3 AU, aphelion distance 5.4 AU) since it encountered Jupiter in 1992. The in situ dust detector on board continuously measured interstellar dust grains with masses up to 10-13 k…
Hinode Observations of Horizontal Quiet Sun Magnetic Flux and the ``Hidden Turbulent Magnetic Flux''
Tsuneta, Saku; Shimizu, Toshifumi; Kubo, Masahito +10 more
We present observations of magnetic fields of the very quiet Sun near disk center using the Spectro-Polarimeter of the Solar Optical Telescope aboard the Hinode satellite. These observations reveal for the first time the ubiquitous presence of horizontal magnetic fields in the internetwork regions. The horizontal fields are spatially distinct from…
Solar Transition Region Features Observed with Hinode/EIS
Del Zanna, Giulio; Doschek, George A.; Hara, Hirohisa +3 more
Two types of solar active region feature prominent at transition region temperatures are identified in Hinode/EIS data of AR 10938 taken on 2007 January 20. The footpoints of 1 MK TRACE loops are shown to emit strongly in emission lines formed at log T = 5.4-5.8, allowing the temperature increase along the footpoints to be clearly seen. A density …
Magnetic field rotation analysis and the applications
Lucek, E.; Dunlop, M.; Liu, Z. X. +4 more
An analysis technique, termed MRA (magnetic rotation analysis), has been designed to probe three-dimensional magnetic field topology. It is based on estimating the gradient tensor of four-point measurements of the magnetic field which have been taken by the Cluster mission. The method first constructs the symmetrical magnetic rotation tensor and i…
X-Ray Study of Temperature and Abundance Profiles of the Cluster of Galaxies Abell 1060 with Suzaku
Ishida, Manabu; Sato, Kosuke; Fukazawa, Yasushi +14 more
We carried out observations of the central and 20' east offset regions of the cluster of galaxies Abell 1060 with Suzaku. Spatially resolved X-ray spectral analysis has revealed temperature and abundance profiles of Abell 1060 out to 27' ≃ 380 h70-1 kpc, which corresponds to ∼ 0.25 r180. Temperature decrease of the…
Young lava flows on the eastern flank of Ascraeus Mons: Rheological properties derived from High Resolution Stereo Camera (HRSC) images and Mars Orbiter Laser Altimeter (MOLA) data
Head, J. W.; Neukum, G.; Hiesinger, H.
We report on estimates of the rheological properties of late-stage lava flows on the eastern flank of Ascraeus Mons, Mars. From previous studies it is known that the dimensions of flows reflect rheological properties such as yield strength, effusion rates, and viscosity. Our estimates are based on new high-resolution images obtained by the High Re…
Surface composition of Hyperion
Sotin, C.; Brown, R. H.; Baines, K. H. +28 more
Hyperion, Saturn's eighth largest icy satellite, is a body of irregular shape in a state of chaotic rotation. The surface is segregated into two distinct units. A spatially dominant high-albedo unit having the strong signature of H2O ice contrasts with a unit that is about a factor of four lower in albedo and is found mostly in the bott…
Mass loading of Saturn's magnetosphere near Enceladus
Dougherty, Michele K.; Russell, Christopher T.; Khurana, Krishan K. +1 more
The Cassini spacecraft has made three close flybys of Enceladus. The magnetic field from the first flyby clearly showed that Enceladus acts as an obstacle to the magnetized flow resulting in field line draping. The second flyby confirmed the draping pattern but hinted that the effective source must be located below Enceladus and demonstrated that …
Rapid rotation of a sunspot associated with flares
Yan, X. L.; Qu, Z. Q.
Context: Active region NOAA 10424 observed on August 5, 2003 is studied in detail by using TRACE, SOHO/MDI, BBSO Hα monograph, and GOES data. This investigation focuses on the sunspot rotation and its relation with the eruptive phenomena by analyzing the magnetic configuration that the rotation results in.
Aims: It is shown that there is a clo…