Search Publications
Auroral evidence of Io's control over the magnetosphere of Jupiter
Bonfond, B.; Clarke, J. T.; Gérard, J. -C. +5 more
Contrary to the case of the Earth, the main auroral oval on Jupiter is related to the breakdown of plasma corotation in the middle magnetosphere. Even if the root causes for the main auroral emissions are Io's volcanism and Jupiter's fast rotation, changes in the aurora could be attributed either to these internal factors or to fluctuations of the…
Inverse Compton X-Ray Emission from Supernovae with Compact Progenitors: Application to SN2011fe
Hurley, K.; Costa, E.; Fransson, C. +39 more
We present a generalized analytic formalism for the inverse Compton X-ray emission from hydrogen-poor supernovae and apply this framework to SN 2011fe using Swift X-Ray Telescope (XRT), UVOT, and Chandra observations. We characterize the optical properties of SN 2011fe in the Swift bands and find them to be broadly consistent with a "normal" SN Ia…
Saturn's icy satellites and rings investigated by Cassini-VIMS: III - Radial compositional variability
Brown, R. H.; Baines, K. H.; Buratti, B. J. +16 more
In the last few years Cassini-VIMS, the Visible and Infrared Mapping Spectrometer, returned to us a comprehensive view of the Saturn's icy satellites and rings. After having analyzed the satellites' spectral properties (Filacchione, G., Capaccioni, F., McCord, T.B., Coradini, A., Cerroni, P., Bellucci, G., Tosi, F., D'Aversa, E., Formisano, V., Br…
Hubble Space Telescope Hα imaging of star-forming galaxies at z ≃ 1-1.5: evolution in the size and luminosity of giant H II regions
Rigby, J. R.; Smail, Ian; Jones, T. +10 more
We present Hubble Space Telescope/Wide Field Camera 3 narrow-band imaging of the Hα emission in a sample of eight gravitationally lensed galaxies at z = 1-1.5. The magnification caused by the foreground clusters enables us to obtain a median source plane spatial resolution of 360 pc, as well as providing magnifications in flux ranging from ∼10× to…
What can We Learn about Solar Coronal Mass Ejections, Coronal Dimmings, and Extreme-ultraviolet Jets through Spectroscopic Observations?
He, Jiansen; Wang, Xin; McIntosh, Scott W. +2 more
Solar eruptions, particularly coronal mass ejections (CMEs) and extreme-ultraviolet (EUV) jets, have rarely been investigated with spectroscopic observations. We analyze several data sets obtained by the EUV Imaging Spectrometer on board Hinode and find various types of flows during CMEs and jet eruptions. CME-induced dimming regions are found to …
Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317
Auvergne, M.; Baudin, F.; Poretti, E. +14 more
Context. OB stars are important building blocks of the Universe, but we have only a limited sample of them well understood enough from an asteroseismological point of view to provide feedback on the current evolutionary models. Our study adds one special case to this sample, with more observational constraints than for most of these stars.
Ai…
SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy
Giroletti, M.; Stawarz, Ł.; Raiteri, C. M. +11 more
We report Fermi Large Area Telescope (LAT) observations of the radio-loud active galactic nucleus SBS 0846+513 (z = 0.5835), optically classified as a narrow-line Seyfert 1 galaxy, together with new and archival radio-to-X-ray data. The source was not active at γ-ray energies during the first two years of Fermi operation. A significant increase in…
Modelling Herschel observations of hot molecular gas emission from embedded low-mass protostars
Wolfire, M. G.; van Dishoeck, E. F.; Bruderer, S. +6 more
Aims: Young stars interact vigorously with their surroundings, as evident from the highly rotationally excited CO (up to Eu/k = 4000 K) and H2O emission (up to 600 K) detected by the Herschel Space Observatory in embedded low-mass protostars. Our aim is to construct a model that reproduces the observations quantitatively…
Hard-X-ray emission lines from the decay of 44Ti in the remnant of supernova 1987A
Tsygankov, S. S.; Lutovinov, A. A.; Grebenev, S. A. +1 more
It is assumed that the radioactive decay of 44Ti powers the infrared, optical and ultraviolet emission of supernova remnants after the complete decay of 56Co and 57Co (the isotopes that dominated the energy balance during the first three to four years after the explosion) until the beginning of active interaction o…
The radial distribution of galaxies in groups and clusters
Belokurov, V.; Koposov, S. E.; McGee, S. L. +2 more
We present a new catalogue of 55 121 groups and clusters centred on luminous red galaxies from Sloan Digital Sky Survey Data Release 7 in the redshift range 0.15 ≤z≤ 0.4. We provide halo mass (M500) estimates for each of these groups derived from a calibration between the optical richness of bright galaxies (Mr≤-20.5) within …