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Monte Carlo simulations of the water vapor plumes on Enceladus
Toon, Owen B.; Esposito, Larry W.; Stewart, A. I. F. +2 more
Monte Carlo simulations are used to model the July 14, 2005 UVIS stellar occultation observations of the water vapor plumes on Enceladus. These simulations indicate that the observations can be best fit if the water molecules ejected along the Tiger Stripes in the South Polar region of Enceladus have a vertical surface velocity of 300-500 m/s at t…
Meridional variations of C 2H 2 and C 2H 6 in Jupiter's atmosphere from Cassini CIRS infrared spectra
Irwin, P. G. J.; Teanby, N. A.; Parrish, P. D. +12 more
Hydrocarbons such as acetylene (C 2H 2) and ethane (C 2H 6) are important tracers in Jupiter's atmosphere, constraining our models of the chemical and dynamical processes. However, our knowledge of the vertical and meridional variations of their abundances has remained sparse. During the flyby of the Cas…
The XMM-Newton serendipitous survey. III. The AXIS X-ray source counts and angular clustering
Bauer, F. E.; Ebrero, J.; Page, M. J. +14 more
Context: Recent results have revised upwards the total X-ray background (XRB) intensity below ~10 keV, therefore an accurate determination of the source counts is needed. There are also contradictory results on the clustering of X-ray selected sources.
Aims: We have studied the X-ray source counts in four energy bands: soft (0.5-2 keV), hard (…
The variable X-ray spectrum of Markarian 766. II. Time-resolved spectroscopy
Turner, T. J.; Kraemer, S. B.; Reeves, J. N. +1 more
Context: The variable X-ray spectra of AGN systematically show steep power-law high states and hard-spectrum low states. The hard, low state has previously been found to be a component with only weak variability. The origin of this component and the relative importance of effects such as absorption and relativistic blurring are currently not clear…
On the Evolution of Coronal Mass Ejections in the Interplanetary Medium
Webb, D. F.; Fry, C. D.; Howard, T. A. +1 more
Two coronal mass ejections (CMEs) are presented which were tracked through the LASCO field of view (FOV) within 30 Rsolar and later as interplanetary CMEs (ICMEs) through the SMEI FOV from 80 to 150 Rsolar. They were also associated with erupting filaments observed by EIT, providing information on trajectory of propagation. T…
Scaling relations and mass calibration of the X-ray luminous galaxy clusters at redshift ~0.2: XMM-Newton observations
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +4 more
We present the X-ray properties and scaling relations of a flux-limited morphology-unbiased sample of 12 X-ray luminous galaxy clusters at redshift around 0.2 based on XMM-Newton observations. The scaled radial profiles are characterized by a self-similar behavior at radii outside the cluster cores (>0.2 r500) for the temperature (T∝…
The Eruption from a Sigmoidal Solar Active Region on 2005 May 13
Liu, Chang; Wang, Haimin; Yurchyshyn, Vasyl +4 more
This paper presents a multiwavelength study of the M8.0 flare and its associated fast halo CME that originated from a bipolar NOAA AR 10759 on 2005 May 13. The source active region has a conspicuous sigmoid structure at the TRACE 171 Å channel as well as in the SXI soft X-ray images, and we mainly concern ourselves with the detailed process of the…
Hyperspectral imaging of convective CO2 ice clouds in the equatorial mesosphere of Mars
Bibring, J. -P.; Gondet, B.; Langevin, Y. +4 more
A unique feature of the Martian climate is the possibility for carbon dioxide, the main atmospheric constituent, to condense as ice. CO2 ice is usually detected as frost but is also known to exist as clouds. This paper presents the first unambiguous observation of CO2 ice clouds on Mars. These images were obtained by the visi…
Hinode Observations of a Vector Magnetic Field Change Associated with a Flare on 2006 December 13
Tsuneta, Saku; Shimizu, Toshifumi; Kubo, Masahito +10 more
Continuous observations of the flare productive active region 10930 were successfully carried out with the Solar Optical Telescope aboard the Hinode spacecraft during 2006 December 6 to 19. We focused on the evolution of photospheric magnetic fields in this active region, and the magnetic field properties at the site of the X3.4 class flare, using…
Arcfinder: an algorithm for the automatic detection of gravitational arcs
Seidel, G.; Bartelmann, M.
We present an efficient algorithm designed for and capable of detecting elongated, thin features such as lines and curves in astronomical images, and its application to the automatic detection of gravitational arcs. The algorithm is sufficiently robust to detect such features even if their surface brightness is near the pixel noise in the image, y…