Search Publications
Lensed galaxies in Abell 370. I. Modeling the number counts and redshift distribution of background sources
Kneib, J. P.; Soucail, G.; Bézecourt, J. +1 more
We present new observations of the cluster-lens Abell 370: a deep HST/WFPC2 F675W image and ESO 3.6m spectroscopy of faint galaxies. These observations shed new light on the statistical properties of faint lensed galaxies. In particular, we spectroscopically confirm the multiple image nature of the B2-B3 gravitational pair (\cite{kneib93}), and de…
IUE observations of the high-velocity symbiotic star AG Draconis. III. A compendium of 17 years of UV monitoring, and comparison with optical and X-ray observations
Greiner, J.; González-Riestra, R.; Viotti, R. +1 more
We present the first extensive analysis of the ultraviolet observations with the IUE mission of the high velocity symbiotic system
The nature of strings in the nebula around eta Carinae
Weis, K.; Duschl, W. J.; Chu, Y. -H.
eta Carinae is one of the most extreme cases of a Luminous Blue Variable star. A bipolar nebula of 17('') size surrounds the central object. Even further out, a large amount of filamentary material extends to a distance of 30'' or about 0.3 pc. In this paper we present a detailed kinematic and morphological analysis of some outer filaments in this…
Microwave enhancement and variability in the elephant's trunk coronal hole: Comparison with SOHO observations
Thompson, B. J.; Gopalswamy, N.; Shibasaki, K. +2 more
We report on an investigation of the microwave enhancement and its variability in the elephant's trunk coronal hole observed during the Whole Sun Month campaign (August 10 to September 9, 1996). The microwave images from the Nobeyama radioheliograph were compared with magnetograms and EUV images obtained simultaneously by the Michelson Doppler ima…
Observations and a model for the infrared continuum of Centaurus A
Lutz, D.; Sturm, E.; Alexander, D. M. +4 more
We present ISOSWS, ISOPHOT_S and 8-13µm observations of Centaurus A which show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We find that, in a small nuclear aperture (~4arcsec, ~60pc), the spectral energy distribution is characteristic of emission from a starburst and dus…
Detection of widely distributed UIR band emission in the disk of NGC 891
Lemke, D.; Lehtinen, K.; Mattila, K.
The spectrum of the unidentified infrared (UIR) emission bands between 5.9 and 11.7 mu m has been observed for the first time in the disk of an external galaxy. We have used the low-resolution spectrometer of the ISOPHOT instrument aboard ISO. The UIR bands at 6.2, 7.7, 8.6, and 11.3 mu m have absolute intensities which are similar to the values o…
The Abundance of Interstellar Tin and Cadmium
Sofia, Ulysses J.; Meyer, David M.; Cardelli, Jason A.
We have determined the gas-phase interstellar abundance of the dominant ions of tin and cadmium (Sn II and Cd II) in the diffuse clouds toward 14 and 5 stars, respectively. Our measurements show that tin is exchanged between the gas and dust phases of the diffuse interstellar medium, while cadmium is not. The sight lines showing the highest gas-ph…
Faint source detection in ISOCAM images
Aussel, H.; Elbaz, D.; Cesarsky, C. +2 more
We present a tool adapted to the detection of faint mid-infrared sources within ISOCAM mosaics. This tool is based on a wavelet analysis which allows us to discriminate sources from cosmic ray impacts at the very limit of the instrument, four orders of magnitudes below IRAS. It is called PRETI for Pattern REcognition Technique for ISOCAM data, bec…
Detection of the O VI 103.2 NM line polarization by the SUMER spectrometer on the SOHO spacecraft
Raouafi, N. -E.; Lemaire, P.; Sahal-Bréchot, S.
The first detection of the O VI 103.2 nm line polarization has been performed in the corona by SUMER (Solar Ultraviolet Measurements of Emitted Radiation) on the SOHO (Solar Heliospheric Observatory). The polarization properties of the spectrometer was used to analyze the solar radiation in a coronal hole at about 270 arcsec above the south solar …
Streamer disconnection events observed with the LASCO coronagraph
Lamy, P. L.; Howard, R. A.; Sheeley, N. R., Jr. +2 more
We present Large Angle Spectrometric Coronagraph (LASCO) observations of two events that suggest magnetic disconnection in coronal streamers. During the 1-2 days preceding each event, successions of narrow looptops are seen rising slowly through the 2-6 RS field of view, forming a bright streamer stalk which continues to elongate with t…