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MERLIN observations of Stephan's Quintet
Muxlow, T. W. B.; Garrington, S. T.; Xanthopoulos, E. +1 more
We present MERLIN L-band images of the compact galaxy group, Stephan's Quintet (SQ). The Seyfert 2 galaxy, NGC 7319, the brightest member of the compact group, is seen to have a triple radio structure typical of many extra-galactic radio sources that have a flat spectrum core and two steep spectrum lobes with hot spots. The two lobes are asymmetri…
The UV environment of the Beagle 2 landing site: detailed investigations and detection of atmospheric state
Zarnecki, John C.; Cockell, Charles S.; Patel, Manish R. +2 more
December 25th 2003 will see the Beagle 2 lander arrive at the surface of Mars in the Isidis region, allowing for the first time in situ measurements of ultraviolet (UV) flux directly from the surface of Mars through the use of a sensor designed as part of a miniaturised environmental package. The expected conditions the sensor will experience are …
The interaction of comet 153P/Ikeya-Zhang with interplanetary coronal mass ejections: Identification of fast ICME signatures
Brandt, John C.; Jones, Geraint H.
The active comet 153P/Ikeya-Zhang possessed a highly-variable plasma tail. Favorable circumstances allowed the identification of the impact of fast ICMEs with the comet. The impact produces a specific morphology including a characteristic scalloped appearance which suggests that the ICME magnetic field drapes around preexisting tail density enhanc…
Solar latitudinal distortions: From observations to theory
Lefebvre, S.; Rozelot, J. P.
Solar diameters have been measured from different ground-based instruments on different sites all around the world. There are values dating back to three centuries ago, but the revival of interest began in the 1970s when it was claimed that a temporal periodic modulation had been found. The interest of such measurements, pinpointed from only two d…
The Stellar Content of the Polar Rings in the Galaxies NGC 2685 and NGC 4650A
Tikhonov, N. A.; Galazutdinova, O. A.; Hagen-Thorn, V. A. +3 more
We present the results of stellar photometry of polar ring galaxies NGC 2685 and NGC 4650A, using the archival data obtained with the Hubble Space Telescope's Wide Field Planetary Camera 2. Polar rings of these galaxies were resolved into ~800 and ~430 stellar objects in the B, V, and IC bands, a considerable part of which are blue supe…
Soft X-ray heating of the solar chromosphere during the gradual phase of two solar flares
Heinzel, P.; Berlicki, A.
In this paper we perform an analysis of the energetics of the solar flaring chromosphere irradiated by soft X-rays (SXR) emitted from overlying hot flare loops. To study an expected SXR heating we used the observations of two solar flares obtained with the Multichannel Subtractive Double Pass (MSDP) spectrograph attached to the Large Coronagraph o…
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…