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Polar heating in Saturn's thermosphere
Müller-Wodarg, I. C. F.; Miller, S.; Smith, C. G. A. +1 more
A 3-D numerical global circulation model of the Kronian thermosphere has been used to investigate the influence of polar heating. The distributions of temperature and winds resulting from a general heat source in the polar regions are described. We show that both the total energy input and its vertical distribution are important to the resulting t…
Modeling the Energy Budget of Solar Wind Minor Ions: Implications for Temperatures and Abundances
Lie-Svendsen, Øystein; Esser, Ruth
The outflow of oxygen and silicon ions in the solar wind has been studied using a model that extends from the chromosphere into interplanetary space, with emphasis on understanding the energy budget of the minor ions. The model solves coupled gyrotropic transport equations, which account for temperature anisotropies and heat conduction, for all ch…
Simultaneous X-ray and optical spectroscopy of the Seyfert galaxy Mrk 993
Barcons, X.; Carrera, F. J.; Mateos, S. +2 more
We present the results of simultaneous XMM-Newton X-ray and 3.5 m/CAHA optical spectroscopic observations of the Seyfert galaxy Mrk 993. This galaxy exhibited in the past significant variations of its broad emission lines which classified it as Sy1, Sy1.5 and Sy1.9 in different epochs. In order to test the X-ray/optical consistency of the unified …
A Search for Substellar Companions around 15 Weak-Lined T Tauri Stars with the Planetary Camera 2 of the Hubble Space Telescope
Torres, Guillermo; Latham, David W.; Oppenheimer, Benjamin D. +2 more
To search for thermal emission from substellar companions, we have obtained Z-band images of 15 weak-lined T Tauri stars in the Taurus-Auriga and Ophiuchus star-forming regions using the Planetary Camera 2 on the Hubble Space Telescope. We found 18 faint nearby objects at separations larger than 4" but none at smaller separations. For 11 of these …
New insights into the dust properties of the Taurus molecular cloud TMC-2 and its surroundings
del Burgo, C.; Laureijs, R. J.
We present ISOPHOT observations at 120 and 200 µm of a 31 × 57 arcmin2 region, with optical extinction AV ranging between ~ 0.5 and 11 mag, that encloses the Taurus molecular cloud TMC-2. The far-infrared emission is separated into a warm and a cold component using the ISOPHOT data and IRAS measurements at 60 and 100 &m…
Mass Flows in a Disappearing Sunspot Plume
Brosius, Jeffrey W.
We observed a large sunspot in NOAA Active Region 9535 on 2001 July 12, 15, 17, and 19 with three instruments (CDS, EIT, and MDI) on board SOHO. EUV emission lines of O IV (formed at logarithmic temperature of 5.2), O V (5.4), Ne IV (5.2), Ne V (5.5), Ne VI (5.6), Ne VII (5.7), and Ca X (5.9) revealed a large bright plume within the sunspot penumb…
The soft X-ray counterpart of the newly discovered INTEGRAL source IGR J16195-4945
Mereghetti, S.; Sidoli, L.; Vercellone, S. +1 more
The INTEGRAL satellite, during its regular scanning observations of the Galactic plane, has discovered several new X-ray sources emitting above 20 keV. The nature of the great majority of them is still unknown. Here we report on the likely low energy counterpart, observed with ASCA in 1994 and 1997, of one of these sources, IGR J16195-4945. The AS…
The Ultraluminous X-Ray Source X-37 Is a Background Quasar in the Antennae Galaxies
Hayward, T. L.; Brandl, B. R.; Eikenberry, S. S. +8 more
In this Letter we report that a bright, X-ray source in the Antennae galaxies (NGC 4038/9), previously identified as an ultraluminous X-ray source (ULX), is in fact a background quasar. We identify an isolated infrared and optical counterpart within 0.3" +/- 0.5" of the X-ray source X-37. After acquiring an optical spectrum of its counterpart, we …
The Interaction of the Galactic Center Arches Cluster and the Thermal Filaments
Rubin, Robert H.; Colgan, Sean W. J.; Simpson, Janet P. +1 more
We present Infrared Space Observatory (ISO) measurements of the far-infrared (FIR) fine-structure lines [S IV] (10.5 µm), [S III] (33.5 µm), [O III] (51.8 and 88.4 µm), [N III] (57.3 µm), [N II] (121.9 µm), [O I] (63.2 and 145.5 µm), and [C II] (157.7 µm) at five positions on the thermal ``Arched'' Filamen…
The SDSS/XMM-Newton Quasar Sample. I. First Results
Elvis, Martin; Risaliti, Guido
We have searched in the XMM-Newton public archive for quasars in the Sloan Digital Sky Survey First Data Release and found 55 lying in the field of an XMM-Newton observation with exposure times >20 ks (as of 2004 August). The 35 quasars that yielded good X-ray spectra span redshifts from 0.5 to 2.5. The large collecting area of XMM-Newton allow…