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Transiting exoplanets from the CoRoT space mission. IV. CoRoT-Exo-4b: a transiting planet in a 9.2 day synchronous orbit
Mazeh, T.; Aigrain, S.; Zucker, S. +32 more
CoRoT, the first space-based transit search, provides ultra-high-precision light curves with continuous time-sampling over periods of up to 5 months. This allows the detection of transiting planets with relatively long periods, and the simultaneous study of the host star's photometric variability. In this Letter, we report the discovery of the tra…
Identifying Current-Sheet-like Structures in the Solar Wind
Li, G.
In past years, measurements of the solar wind plasma have advanced our understanding of MHD turbulence tremendously. At small scales, the solar wind is believed to be ve`xry multifractal with nonlinear interactions causing an intermittent energy dissipation, leading to possible current-sheet structures. In this Letter, we propose a systematic data…
Evidence for temporal variability of Enceladus' gas jets: Modeling of Cassini observations
Dougherty, Michele K.; Saur, Joachim; Simon, Sven +5 more
Time variability of Enceladus' gas plume is deduced from a joint investigation of Cassini spacecraft magnetic field data obtained during the first three flybys E0, E1 and E2 and neutral density measurements during the E2 flyby with a model that describes Enceladus' plasma interaction with individual jets. We infer a total plume content of ~7 × 10<…
A Space Telescope Imaging Spectrograph Survey for O VI Absorption Systems at 0.12 < z lesssim 0.5. II. Physical Conditions of the Ionized Gas
Chen, Hsiao-Wen; Thom, C.
We present a complete catalog of 27 O VI absorbers at low redshift (0.12 < z < 0.5) from a blind survey of 16 QSO echelle spectra in the Hubble Space Telescoep Space Telescope Imaging Spectrograph data archive. These absorbers are identified based only on matching line profiles and the expected doublet ratio between the λλ1031, 1037 transiti…
Outburst of the 2 s Anomalous X-Ray Pulsar 1E 1547.0-5408
Camilo, F.; Ransom, S. M.; Gotthelf, E. V. +2 more
Following our discovery of radio pulsations from the newly recognized anomalous X-ray pulsar (AXP) 1E 1547.0-5408, we initiated X-ray monitoring with the Swift X-ray telescope and obtained a single target-of-opportunity observation with the Newton X-ray Multi-Mirror Mission (XMM-Newton). In comparison with its historic minimum flux of 3 × 10-…
Structure and Kinematics of Molecular Disks in Fast-Rotator Early-Type Galaxies
Cappellari, Michele; Bureau, Martin; Young, Lisa M.
We present interferometric observations resolving the CO emission in the four gas-rich lenticular galaxies NGC 3032, NGC 4150, NGC 4459, and NGC 4526, and we compare the CO distribution and kinematics to those of the stars and ionized gas. Counterrotation documents an external origin for the gas in at least one case (NGC 3032), and the comparisons…
Recent in-situ observations of magnetic reconnection in near-Earth space
Paschmann, Götz
The paper presents a brief review of recent in-situ observations of reconnection in space, with emphasis on results pertaining to the question of anti-parallel versus component reconnection, the implied spatial and temporal scales, the location of the reconnection sites, particle acceleration, reconnection rates, the dependence on plasma β, and th…
The supermassive black hole of FornaxA
Saglia, R. P.; Nowak, N.; Davies, R. I. +3 more
The radio galaxy FornaxA (NGC 1316) is a prominent merger remnant in the outskirts of the Fornax cluster. Its giant radio lobes suggest the presence of a powerful active galactic nuclei (AGN) and thus a central supermassive black hole (SMBH). FornaxA now seems to be in a transition state between active black hole growth and quiescence, as indicate…
Using Global Simulations to Relate the Three-Part Structure of Coronal Mass Ejections to In Situ Signatures
Riley, Pete; Mikić, Zoran; Lionello, Roberto +1 more
White-light observations of coronal mass ejections (CMEs) often show the classic "three-part" structure consisting of (1) a bright front; (2) a dark cavity; and (3) a bright, compact core. It has proven difficult to unambiguously associate these features with in situ measurements of interplanetary CMEs (ICMEs), in all but a few cases. In this stud…
On the geometry of broad emission region in quasars
Falomo, R.; Treves, A.; Decarli, R. +1 more
We study the geometry of the Hβ broad emission region by comparing the MBH values derived from Hβ through the virial relation with those obtained from the host galaxy luminosity in a sample of 36 low-redshift (z ~ 0.3) quasars. This comparison lets us infer the geometrical factor f needed to deproject the line-of-sight velocity componen…