Search Publications
X-rays from the jet in 3C 273 : Clues from the radio-optical spectra
Meisenheimer, K.; Jester, S.; Röser, H. -J. +1 more
Using new deep VLA and HST observations of the large-scale jet in 3C 273 matched to 0.3 arcsec resolution, we have detected excess near-ultraviolet emission (lambda 300 nm) above a synchrotron cutoff spectrum accounting for the emission from radio through optical (lambda lambda 3.6 cm-620 nm). This necessitates a two-component model for the emissi…
A conspicuous tangential alignment of galaxies in a STIS Parallel Shear Survey field: A new dark-lens candidate?
White, S. D. M.; Fosbury, R. A. E.; Schneider, P. +6 more
We report the serendipituous discovery of a conspicuous alignment of galaxies in a field obtained through the STIS Parallel Shear Survey. This project collects randomly distributed 50'' x 50'' fields to investigate the cosmic shear effect on this scale. Analyzing the parallel observations having the Seyfert galaxy NGC 625 as primary target, we rec…
Detection of solid ammonia, methanol, and methane with ISOPHOT.
Ábrahám, P.; Henning, Th.; Lemke, D. +4 more
We report on a search for the NH3 inversion band at 9.0 mu m, the CH4 band at 7.7 mu m, and the CH3OH band at 9.7 mu m in the spectra of 10 heavily obscured stellar objects taken with the spectrophotometer ISOPHOT-S aboard the Infrared Space Observatory (ISO). Four of them show indications of the NH3 inv…
OH/IR stars in the inner bulge detected by ISOGAL
Blommaert, J. A. D. L.; Ganesh, S.; Omont, A. +6 more
We present a study of known OH/IR stars in the inner bulge, observed by the ISOGAL survey at lambda = 6.8 mu m and lambda = 14.9 mu m. Bolometric corrections and luminosities are computed, based on near and mid-infrared data. The vast majority of the sources exhibit mass-loss rates in the range: 3 x 10-7 up to a few times 10-5
Hydrogen infrared recombination lines as a diagnostic tool for the geometry of the circumstellar material of hot stars
Waters, L. B. F. M.; de Koter, A.; Lenorzer, A.
We have analysed the infrared hydrogen recombination lines of a sample of well studied hot massive stars observed with the Infrared Space Observatory. Our sample contains stars from several classes of objects, whose circumstellar environment is believed to be dominated by an ionized stellar wind (the Luminous Blue Variables) or by a dense disk-lik…
XMM-Newton observation of a distant X-ray selected cluster of galaxies at z=1.26 with possible cluster interaction
Rosati, Piero; Hashimoto, Yasuhiro; Miyaji, Takamitsu +2 more
We report on the XMM-Newton observation of RX J1053.7+5735, one of the most distant (z = 1.26) X-ray selected clusters of galaxies, which also shows an unusual double-lobed X-ray morphology, indicative of possible cluster-cluster interaction. The cluster was discovered during our ROSAT deep pointings in the direction of the Lockman Hole. The XMM-N…
The ISO-LWS map of the Serpens cloud core. II. The line spectra
Liseau, R.; Larsson, B.; Men'shchikov, A. B.
We present spectrophotometric ISO imaging with the LWS and the CAM-CVF of the Serpens molecular cloud core. The LWS map is centred on the far infrared and submillimetre source FIRS 1/SMM 1 and its size is 8',x 8'. The fine structure line emission in [O I] 63 mu m and [C II] 157 mu m is extended on the arcminute scale and can …
Abundances of Planetary Nebula NGC 5315
Pottasch, S. R.; Beintema, D. A.; Feibelman, W. A. +2 more
The ISO and IUE spectra of the elliptical nebula
Multi wavelength investigation of the eruption of a sigmoidal quiescent filament
Delaboudinière, J. P.; Marqué, Ch.; Lantos, P.
We report the first observation of a filament eruption in the metric and decimetric range, where the behavior of the filament can be followed during the event via thermal radio emission diagnostics. The event, occurring on February 28th 2001, involved a quiescent filament in a sigmoid magnetic configuration, whose eruption is triggered by the birt…
BL Lac identification for the ultraluminous X-ray source observed in the direction of NGC 4698
Palazzi, E.; Cappi, M.; Martini, P. +11 more
We report the identification of the optical and radio counterparts of the ultraluminous X-ray (ULX) source XMMU J124825.9+083020 (NGC 4698-ULX1). The optical spectrum taken with the VLT yields a redshift of z=0.43, which implies that the ULX is not associated with the nearby galaxy NGC 4698. The spectral energy distribution calculated from the ava…