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Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar source
Möstl, C.; Farrugia, C. J.; Temmer, M. +5 more
This paper compares properties of the source region with those inferred from satellite observations near Earth of the magnetic cloud which reached 1 AU on 20 November 2003. We use observations from space missions SOHO and TRACE together with ground-based data to study the magnetic structure of the active region NOAA 10501 containing a highly curve…
High precision X-ray log N - log S distributions: implications for the obscured AGN population
Treister, E.; Ebrero, J.; Page, M. J. +13 more
Context: Our knowledge of the properties of AGN, especially those of optical type-2 objects, is very incomplete. Because extragalactic source count distributions are dependent on the cosmological and statistical properties of AGN, they provide a direct method of investigating the underlying source populations.
Aims: We aim to constrain the ext…
An equatorial oscillation in Saturn's middle atmosphere
Strobel, D. F.; Flasar, F. M.; Bézard, B. +3 more
The middle atmospheres of planets are driven by a combination of radiative heating and cooling, mean meridional motions, and vertically propagating waves (which originate in the deep troposphere). It is very difficult to model these effects and, therefore, observations are essential to advancing our understanding of atmospheres. The equatorial str…
The Origin of the Intrinsic Scatter in the Relation Between Black Hole Mass and Bulge Luminosity for Nearby Active Galaxies
Ho, Luis C.; Barth, Aaron J.; Im, Myungshin +4 more
We investigate the origin of the intrinsic scatter in the correlation between black hole mass (MBH) and bulge luminosity (Lbul) in a sample of 45 massive, local (zlesssim 0.35) type 1 active galactic nuclei (AGNs). We derive MBH from published optical spectra assuming a spherical broad-line region, and Lbul
Determining Atmospheric Conditions at the Terminator of the Hot Jupiter HD 209458b
Sing, David K.; Ehrenreich, D.; Lecavelier des Etangs, A. +3 more
We present a theoretical model fit to the HST STIS optical transit transmission spectrum of HD 209458b. In our fit, we use the sodium absorption line profile along with the Rayleigh scattering by H2 to help determine the average temperature-pressure profile at the planetary terminator and infer the abundances of atomic and molecular spe…
Fluvial erosion and post-erosional processes on Titan
Sotin, Christophe; Barnes, Jason W.; Rodriguez, Sebastien +16 more
The surface of Titan has been revealed by Cassini observations in the infrared and radar wavelength ranges as well as locally by the Huygens lander instruments. Sand seas, recently discovered lakes, distinct landscapes and dendritic erosion patterns indicate dynamic surface processes. This study focus on erosional and depositional features that ca…
XMM-Newton observations of the supernova remnant IC 443. II. Evidence of stellar ejecta in the inner regions
Troja, E.; Miceli, M.; Bocchino, F. +1 more
Aims: We investigate the spatial distribution of the physical and chemical properties of the hot X-ray emitting plasma of the supernova remnant IC 443, to derive important constraints on its ionization stage, on the progenitor supernova explosion, on the age of the remnant, and its physical association with a close pulsar wind nebula.
Methods:…
XMM-Newton Observations of the Narrow-Line Seyfert 1 Galaxy Mrk 335 in a Historical Low X-Ray Flux State
Fabian, Andrew C.; Gallo, Luigi C.; Miniutti, Giovanni +5 more
We report the discovery of strong soft X-ray emission lines and a hard continuum above 2 keV in the narrow-line Seyfert 1 galaxy Mrk 335 during an extremely low X-ray flux state. Mrk 335 was observed for 22 ks by XMM-Newton in 2007 July as a Target of Opportunity to examine it in its X-ray low flux state, which was discovered with Swift. Long-term…
Saturn's magnetodisc current sheet
Russell, C. T.; Dougherty, M. K.; Khurana, K. K. +5 more
Pioneer 11 observations from the dawn flank of Saturn's magnetosphere provided evidence for a thin equatorial current sheet. Magnetometer data from the Cassini orbiter have also revealed the presence of this current sheet and shown it to be a consistent feature of the dawn flank. Arridge et al. (2007) recently investigated the stress balance in th…
The Hubble Space Telescope Advanced Camera for Surveys Coma Cluster Survey. I. Survey Objectives and Design
Ferguson, Henry C.; Mobasher, Bahram; Miller, Bryan W. +34 more
We describe the HST ACS Coma Cluster Treasury survey, a deep two-passband imaging survey of one of the nearest rich clusters of galaxies, the Coma Cluster (Abell 1656). The survey was designed to cover an area of 740 arcmin2 in regions of different density of both galaxies and intergalactic medium within the cluster. The ACS failure of …