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Induced magnetosphere and its outer boundary at Venus
Barabash, S.; Russell, C. T.; Wei, H. Y. +8 more
The induced magnetosphere at Venus consists of regions near the planet and its wake for which the magnetic pressure dominates all other pressure contributions. Initial Venus Express measurements indicate a well-defined outer boundary, the magnetopause, of the induced magnetosphere. This magnetopause acts as an obstacle to deflect the solar wind. A…
Characterizing the Near-UV Environment of M Dwarfs
Hawley, Suzanne L.; Johns-Krull, Christopher M.; Walkowicz, Lucianne M.
We report the results of our Hubble Space Telescope (HST) snapshot survey with the ACS HRC PR200L prism, designed to measure the near-UV emission in a sample of nearby M dwarfs. Thirty-three stars were observed, spanning the mass range from 0.1 to 0.6 solar masses (Teff ~ 2200-4000 K) where the UV energy distributions vary widely betwee…
High-Resolution Mapping of Flows in the Solar Interior: Fully Consistent OLA Inversion of Helioseismic Travel Times
Birch, A. C.; Gizon, L.; Jackiewicz, J.
To recover the flow information encoded in travel-time data of time - distance helioseismology, accurate forward modeling and a robust inversion of the travel times are required. We accomplish this using three-dimensional finite-frequency travel-time sensitivity kernels for flows along with a (2+1)-dimensional (2+1D) optimally localized averaging …
INTEGRAL discovery of non-thermal hard X-ray emission from the Ophiuchus cluster
Paltani, S.; Eckert, D.; Produit, N. +2 more
We present the results of deep observations of the Ophiuchus cluster of galaxies with INTEGRAL in the 3-80 keV band. We analyse 3 Ms of INTEGRAL data on the Ophiuchus cluster with the IBIS/ISGRI hard X-ray imager and the JEM-X X-ray monitor. In the X-ray band using JEM-X, we show that the source is extended, and that the morphology is compatible w…
High-latitude Earth's magnetopause outside the cusp: Cluster observations
RèMe, H.; Korth, A.; Büchner, J. +4 more
We investigated the ambient plasma and magnetic field conditions at high latitudes, as well as the macroparameters of the magnetopause. For this purpose we used Cluster spacecraft plasma and magnetic field data when all the interspacecraft distances were less than 300 km. We analyzed 154 magnetosheath-magnetosphere transitions which allow to disti…
INTEGRAL observations of the blazar Mrk 421 in outburst. Results of a multi-wavelength campaign
Lähteenmäki, A.; Ajello, M.; Horan, D. +15 more
Context: If one wants to understand the physics of blazars, better simultaneous observations are important at all wavelengths, so it was fortunate that a ToO observation of the TeV-emitting blazar Mrk 421 with INTEGRAL could be triggered in June 2006 by an increase in the RXTE count rate to more than 30 mCrab. The source was then observed with all…
Rotational Feature of Vega Revealed from Spectral Line Profiles
Takeda, Yoichi; Kawanomoto, Satoshi; Ohishi, Naoko
In order to establish Vega's absolute rotational velocity, ve, as distinct from the inclination angle, i, we conducted a detailed profile study on a large number (~200) of weak lines based on very high signal-to-noise ratio spectrum data, making use of the fact that the lines' characteristic shapes may contain information about rotation…
Giant outburst of EXO 2030+375: pulse-phase resolved analysis of INTEGRAL data
Klochkov, D.; Santangelo, A.; Ferrigno, C. +1 more
In June-September 2006 the Be/X-ray binary EXO 2030+375 experienced the second giant outburst since its discovery. The source was shown to have a complicated pulse-averaged X-ray spectral continuum with possible evidence of cyclotron absorption features. In this paper we present the first pulse-phase resolved analysis of the broad band X-ray spect…
Investigation of water vapor on Mars with PFS/SW of Mars Express
Lellouch, E.; Ignatiev, N. I.; Fouchet, T. +4 more
New insight into the seasonal, diurnal and spatial distribution of water vapor on Mars has been obtained from analyzing the spectra of the short-wavelength channel (SW) of the Planetary Fourier Spectrometer (PFS) onboard Mars Express. The processed dataset, recorded between January 2004 and April 2005, covers the seasons from L=331° of Mars Year 2…
Suzaku Wide-Band X-Ray Spectroscopy of the Seyfert2 AGN in NGC 4945
Done, Chris; Isobe, Naoki; Gandhi, Poshak +13 more
Suzaku observed a nearby Seyfert2 galaxy, NGC 4945, which hosts one of the brightest active galactic nuclei above 20keV. Combining data from the two detectors aboard Suzaku, the AGN intrinsic nuclear emission and its reprocessed signals were observed simultaneously. The intrinsic emission is highly obscured with an absorbing column of ∼5×1024…