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Polarimetry of the Protoplanetary Nebula AFGL 2688
Miroshnichenko, A. S.; Klochkova, V. G.; Panchuk, V. E. +1 more
Our spectroscopic (with resolution R=75 000) and spectropolarimetric (R=15 000) observations with the 6-m telescope of the Special Astrophysical Observatory have enabled us to distinguish photospheric and circumstellar features in the optical spectrum of the bipolar protoplanetary nebula AFGL 2688 for the first time. The linear polarization of the…
Large-scale structure in the ELAIS S1 Survey
Pozzi, F.; Vaccari, M.; Serjeant, S. +6 more
We present an analysis of the two-point angular correlation function of The European Large-Area Infrared Space Observatory (ELAIS) S1 survey. The survey covers 4 deg2 and contains 462 sources detected at 15 µm to a 5σ flux limit of 0.45 mJy. Using the 329 extragalactic sources not repeated in different observations, we detect a si…
Meteorological predictions for the Beagle 2 mission to Mars
Michaels, Timothy I.; Haberle, Robert M.; Rafkin, Scot C. Randell
A general circulation and mesoscale model are used to predict the weather at the Beagle 2 landing site. The afternoon high temperature predicted by the general circulation model varies from 237 to 243 K over the duration of the primary mission. The overnight low temperature is 193 K +/- 2 K. Near surface wind speeds remain below 15 ms-1…
Is the giant elliptical galaxy NGC 5018 a post-merger remnant?
Bressan, A.; Buson, L. M.; Burstein, D. +2 more
NGC 5018, one of the weakest UV emitters among giant ellipticals (gE) observed with IUE, appears to consist of an optical stellar population very similar to that of the compact, dwarf elliptical M 32, which is several magnitudes fainter in luminosity than NGC 5018 and whose stellar population is known to be ∼3 Gyr old. Here we show that the mid-UV…
New observations from Cassini and Ulysses of Jovian VLF radio emissions
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +2 more
Simultaneous observations of Jupiter's so-called reradiated VLF radio emission by the Cassini and Ulysses spacecraft confirm that the emission is radiated into all directions in a pulse or strobe light-like fashion. These observations rule out a source that corotates with the planet. Observations of the same VLF emission component during the Cassi…
Astrometric monitoring of the binary brown dwarf DENIS-P J1228.2-1547
Martín, E. L.; Bouy, H.; Brandner, W. +4 more
We present astrometric monitoring data of the binary brown dwarf DENIS-P J1228.2-1547. The data have been obtained with the Hubble Space Telescope over a time span of 5.5 yr, and confirm that DENIS-P J1228.2-1547 is indeed a common proper motion, i.e., physical, binary. The data cover about 1/8th of the binary orbit, indicating an orbital period o…
A Detailed Study of Opacity in the Upper Atmosphere of Proxima Centauri
Christian, D. J.; Mathioudakis, M.; Bloomfield, D. S. +2 more
We present far-UV and UV spectroscopic observations of Proxima Centauri obtained as part of our continued investigation into the optically thin approximation assumed for the transition regions of late-type stars. Significant opacity is found in the C III lines during both the quiescent and flaring states of Proxima Cen, with up to 70% of the expec…
Multiwavelength Properties of the X-Ray Sources in the Groth-Westphal Strip Field
Yamada, Toru; Griffiths, Richard E.; Sarajedini, Vicki +4 more
We summarize the multiwavelength properties of X-ray sources detected in the 80 ks XMM-Newton observation of the Groth-Westphal strip, a contiguous strip of 28 Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) images. Among the ~150 X-ray sources detected in the XMM-Newton field of view, 23 are within the WFPC2 fields. Ten spectroscopic…
Acceleration of electrons by interacting CMEs
Odstrcil, D.; Vandas, M.
There is growing observational evidence that interaction of coronal mass ejections (CMEs) near the Sun is a common phenomenon, particularly during the solar cycle's maximum years. Recently, we performed 2.5-D MHD simulations of the interaction between two magnetic flux ropes. The aim was to provide some qualitative picture of the shock-cloud and c…
Cluster observations of ELF/VLF signals generated by modulated heating of the lower ionosphere with the HAARP HF transmitter
Platino, M.; Canu, P.; Bell, T. +5 more
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