Search Publications
Galaxy populations of double cluster RX J1053.7+5735 at z = 1.13
Hasinger, G.; Schmidt, M.; Hashimoto, Yasuhiro +2 more
We present a study of the galaxy population in the cluster RX J1053.7+5735, one of the most distant X-ray selected clusters of galaxies and one which also shows an unusual double-lobed X-ray morphology, indicative of a possible equal-mass cluster merger. The cluster was discovered during the ROSAT deep pointings in the direction of the Lockman Hol…
Astrophysical laser operating in the OI 8446-Åline in the Weigelt blobs of η Carinae
Johansson, S.; Letokhov, V. S.
Within the framework of a simple model of photophysical processes in the Weigelt blobs in the vicinity of the luminous blue variable (LBV) star η Carinae, we explain the presence of the fluorescent <OI> 8446-Åand forbidden [OI] 6300-Ålines as well as the absence of the allowed OI 7774-Åline in spectra recorded with the Hubble Space Telescope…
Resolving the Shocks in Radio Galaxy Nebulae: Hubble Space Telescope and Radio Imaging of 3C 171, 3C 277.3, and PKS 2250-41
Koekemoer, Anton M.; Baum, Stefi A.; O'Dea, Christopher P. +5 more
We present the results of Hubble Space Telescope (HST) WFPC2 medium-band and narrowband imaging and Very Large Array and MERLIN2 radio imaging of three powerful radio galaxies: 3C 171, 3C 277.3, and PKS 2250-41. We obtained images of the rest frame [O III] λ5007 and [O II] λ3727 line emission using the linear ramp filters on WFPC2. The correlation…
INTEGRAL observations of the Be/X-ray binary EXO 2030+375 during outburst
Connell, P.; Beckmann, V.; Blay, P. +4 more
We present a type-I outburst of the high-mass X-ray binary EXO 2030+375, detected during INTEGRAL's Performance and Verification phase in December 2002 (on-source time about 106 s). In addition, six more outbursts have been observed during INTEGRAL's Galactic Plane Scans. X-ray pulsations have been detected with a pulse period of 41.691…
Processes of equatorial thermal structure at Jupiter: An analysis of the Galileo temperature profile with a three-dimensional model
Waite, J. H.; Gladstone, G. R.; Bougher, S. W. +1 more
The Jupiter Thermospheric General Circulation Model (JTGCM) calculates the global dynamical structure of Jupiter's thermosphere self-consistently with its global thermal structure and composition. The main heat source that drives the thermospheric flow is high-latitude Joule heating. A secondary source of heating is the auroral process of particle…
Electron-scale sheets of whistlers close to the magnetopause
Lavraud, B.; André, M.; Stenberg, G. +6 more
Whistler emissions close to the magnetopause on the magnetospheric side are investigated using the four Cluster spacecraft. The waves are found to be generated in thin (electron-scale) sheets moving with the plasma drift velocity. A feature in the electron data coincides with the waves; hot magnetospheric electrons disappear for a few satellite sp…
Eclipsing binary statistics Theory and observation
Söderhjelm, S.; Dischler, J.
The expected distributions of eclipse-depth versus period for eclipsing binaries of different luminosities are derived from large-scale population synthesis experiments. Using the rapid Hurley et al. BSE binary evolution code, we have evolved several hundred million binaries, starting from various simple input distributions of masses and orbit-siz…
HST observations of the pulsating white dwarf GD 358
Kepler, S. O.; Winget, D. E.; Koester, D. +2 more
We used time-resolved ultraviolet spectroscopy obtained with the FOS and STIS spectrographs of the Hubble Space Telescope (HST), together with archival IUE observations to measure the effective temperature (Teff), surface gravity (log g) and distance (d) of the pulsating DB white dwarf GD 358 with unprecedented accuracy, and to show tha…
Dynamics of solar mesogranulation
Hanslmeier, A.; Hirzberger, J.; Pötzi, W. +2 more
Using a 45.5-h time series of photospheric flow fields generated from a set of high-resolution continuum images (SOHO/MDI) we analyze the dynamics of solar mesogranule features. The series was prepared applying a local correlation tracking algorithm with a 4.8´´ FWHM window. By computing 1-h running means in time steps of 10 min we generate 267 av…
Indirect calculation of the magnetic reconnection rate from flare loops
Ireland, J.; Walsh, R. W.; Noglik, J. B.
High time resolution Transition Region And Coronal Explorer (TRACE) 171 and 195 Å observations of the evolution of flare loops on 1999 March 18 have been investigated. Given the location of the magnetic loops on the northeast solar limb and the cadence of the TRACE observations (~50 s), an estimation of the footpoint velocity due to ongoing reconn…