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Observations of Titan’s Northern lakes at 5 µm: Implications for the organic cycle and geology
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +13 more
Since Titan entered Northern spring in August 2009, the North Pole has been illuminated allowing observations at optical wavelengths. On June 5, 2010 the Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini spacecraft observed the Northern Pole area with a pixel size from 3 to 7 km. Since, as we demonstrate, little of the solar flux…
Radio Imaging of Shock-accelerated Electrons Associated with an Erupting Plasmoid on 2010 November 3
Krucker, Säm; Lin, R. P.; Bain, H. M. +1 more
We present observations of a metric type II solar radio burst that occurred on the 3rd of November 2010 in association with an erupting plasmoid. The eruption was well observed by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory and the Reuven Ramaty High Energy Solar Spectroscopic Imager, while the burst occurred in …
X-ray spectral states and metallicity in the ultraluminous X-ray sources NGC 1313 X-1 and X-2
Pintore, Fabio; Zampieri, Luca
We present a systematic analysis of the X-ray spectra of NGC 1313 X-1 and NGC 1313 X-2, using three years of XMM-Newton observations. We fitted the continuum with a Comptonization model plus a multicolour blackbody disc, which describes the effects of an accretion disc plus a corona. We checked the consistency of this spectral model on the basis o…
Earth-based detection of Uranus' aurorae
André, N.; Dougherty, M. K.; Cecconi, B. +16 more
This study is based on multi-planet multi-wavelength observations of planetary aurorae throughout the heliosphere, acquired along the propagation path of a series of consecutive interplanetary shocks. The underlying motivation to track the shocks was to increase the probability of detection of auroral emissions at Uranus. Despite several Earth-bas…
On the Doppler Velocity of Emission Line Profiles Formed in the "Coronal Contraflow" that Is the Chromosphere-Corona Mass Cycle
De Pontieu, Bart; McIntosh, Scott W.; Tian, Hui +1 more
This analysis begins to explore the complex chromosphere-corona mass cycle using a blend of imaging and spectroscopic diagnostics. Single Gaussian fits (SGFs) to hot emission line profiles (formed above 1 MK) at the base of coronal loop structures indicate material blueshifts of 5-10 km s-1, while cool emission line profiles (formed bel…
An XMM-Newton Survey of the Soft X-Ray Background. II. An All-Sky Catalog of Diffuse O VII and O VIII Emission Intensities
Henley, David B.; Shelton, Robin L.
We present an all-sky catalog of diffuse O VII and O VIII line intensities, extracted from archival XMM-Newton observations. This catalog supersedes our previous catalog, which covered the sky between l = 120° and l = 240°. We attempted to reduce the contamination from near-Earth solar wind charge exchange (SWCX) emission by excluding times of hig…
Transmission Spectroscopy of Exoplanet XO-2b Observed with Hubble Space Telescope NICMOS
Crouzet, N.; Burke, C.; Long, D. +1 more
Spectroscopy during planetary transits is a powerful tool to probe exoplanet atmospheres. We present the near-infrared transit spectroscopy of XO-2b obtained with Hubble Space Telescope NICMOS. Uniquely for NICMOS transit spectroscopy, a companion star of similar properties to XO-2 is present in the field of view. We derive improved star and plane…
High-resolution Reddening Map in the Direction of the Stellar System Terzan 5
Dalessandro, Emanuele; Mucciarelli, Alessio; Ferraro, Francesco R. +7 more
We have used optical images acquired with the Hubble Space Telescope to construct the first high-resolution extinction map in the direction of Terzan 5, a peculiar stellar system in the inner bulge of our Galaxy. The map has a spatial resolution of 8'' × 8'', over a total field of view of 200'' × 200''. The absorption clouds show a patchy structur…
On the Weak-wind Problem in Massive Stars: X-Ray Spectra Reveal a Massive Hot Wind in µ Columbae
Hamaguchi, Kenji; Huenemoerder, David P.; Ignace, Richard +4 more
µ Columbae is a prototypical weak-wind O star for which we have obtained a high-resolution X-ray spectrum with the Chandra LETG/ACIS instrument and a low-resolution spectrum with Suzaku. This allows us, for the first time, to investigate the role of X-rays on the wind structure in a bona fide weak-wind system and to determine whether there a…
The Size Evolution of Passive Galaxies: Observations from the Wide-Field Camera 3 Early Release Science Program
Holtzman, J. A.; O'Connell, R. W.; Walker, A. R. +28 more
We present the size evolution of passively evolving galaxies at z ~ 2 identified in Wide-Field Camera 3 imaging from the Early Release Science program. Our sample was constructed using an analog to the passive BzK galaxy selection criterion, which isolates galaxies with little or no ongoing star formation at z >~ 1.5. We identify 30 galaxies in…