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Jupiter's Polar Regions in the Ultraviolet as Imaged by HST/WFPC2: Auroral-Aligned Features and Zonal Motions
West, Robert A.; Ballester, Gilda E.; Crisp, David +16 more
Jupiter's polar regions are examined using ultraviolet (UV, 120-320 nm) images obtained with the Hubble Space Telescope Wide Field and Planetary Camera 2 over the period of 1994-1997. These images probe the stratospheric aerosols at pressures of a few tens of millibars. We discovered a UV-darkened segment in the polar shading just equatorward of t…
VLBI astrometry of the stellar image of U Herculis, amplified by the 1667 MHz OH maser
Baudry, A.; Vlemmings, W.; Beasley, A. J. +2 more
The OH 1667 MHz maser in the circumstellar shell around the Mira variable U Her has been observed with the NRAO Very Long Baseline Array (VLBA) at 6 epochs, spread over 4 years. Using phase referencing techniques the position of the most blue-shifted maser spot was monitored with respect to two extra-galactic radio sources. The absolute radio posi…
Detection of Planetary Transits of the Star HD 209458 in the Hipparcos Data Set
Jenkins, J.; Doyle, L.; Trilling, D. E. +2 more
A search of the Hipparcos satellite photometry data for the star HD 209458 reveals evidence for a planetary transit signature consistent with the planetary properties reported by Henry et al. and Charbonneau et al. and allows further refinement of the planet's orbital period. The long time baseline (about 2926 days or 830 periods) from the best Hi…
The hyperluminous infrared quasar 3C 318 and its implications for interpreting submm detections of high-redshift radio galaxies
Willott, Chris J.; Rawlings, Steve; Jarvis, Matt J.
We present near-infrared spectroscopy and imaging of the compact steep-spectrum radio source 3C 318, which shows it to be a quasar at redshift z=1.574 (the z=0.752 value previously reported is incorrect). 3C 318 is an IRAS, ISO and SCUBA source so its new redshift makes it the most intrinsically luminous far-infrared (FIR) source in the 3C catalog…
Extremely Red Objects from the Hubble Space Telescope NICMOS Parallel Imaging Survey
Teplitz, Harry I.; McCarthy, Patrick J.; Dressler, Alan +5 more
We present a catalog of extremely red objects (EROs) discovered using the Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer (NICMOS) parallel imaging database and ground-based optical follow-up observations. Within an area of 16 arcmin2, we detect 15 objects with R-F160W>5 and F160W<21.5. We have also obtai…
The ISO-LWS map of the Serpens cloud core. I. The SEDs of the IR/SMM sources
Olofsson, G.; Liseau, R.; White, G. J. +11 more
Iso-Lws mapping observations of the Serpens molecular cloud core are presented. The spectral range is 50 - 200 µ m and the map size is 8',x 8'. These observations suffer from severe source confusion at Fir wavelengths and we employ a Maximum Likelihood Method for the spectro-spatial deconvolution. The strong and fairly …
A study of interstellar Nai D absorption lines towards the Lupus molecular clouds
Crawford, I. A.
Intermediate-resolution (60000<=R<=120000) observations of interstellar Nai lines towards 29 stars in the general direction of the Lupus molecular clouds (330°<~l<~350° 0°<~b<~25°) are presented. Previously published spectra towards an additional seven stars are also included. Based on the Hipparcos distances to these stars, and …
The Absolute Abundance of Iron in the Solar Corona
Kundu, M. R.; White, S. M.; Thomas, R. J. +1 more
We present a measurement of the abundance of Fe relative to H in the solar corona using a technique that differs from previous spectroscopic and solar wind measurements. Our method combines EUV line data from the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliospheric Observatory with thermal bremsstrahlung radio data from the VLA. The…
On the propagation of Jovian electrons in the heliosphere: Transport modelling in 4-D phase space
Fichtner, Horst; Potgieter, Marius; Ferreira, Stefan +1 more
For about 25 years the Jovian magnetosphere is known to be a strong source of electrons with energies up to ∼30 MeV. Many in-situ observations have not only confirmed this finding originally made with the Pioneer 10 spacecraft, but have also revealed that the Jovian electrons appear to be present, at least close to the ecliptic plane, in the dista…
The cold dust concentrations in the colliding galaxies NGC 4038/39
Klaas, U.; Haas, M.; Xu, C. +2 more
SCUBA 450 and 850 mu m maps of the Antennae Galaxy resolve the nuclei of NGC 4038/39 and two prominent regions in the overlap area of the galaxy disks. They coincide excellently with bright emission peaks seen on 15 mu m, 6 cm and CO maps. ISOPHOT 60 and 100 mu m maps reveal that the overlap area and the NGC 4038 nucleus are also responsible for t…