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21 papers · 1 filter
Non-confirmation of reported HI clouds without optical counterparts in the Hercules Cluster
W. van Driel, K. O'Neil, V. Cayatte +8
21 cm HI line observations were made with the Arecibo Gregorian telescope of 9 HI clouds in the Hercules Cluster which were reported as tenative detections in a VLA HI study of the…
Constraints on dark energy and quintessence with a comoving standard ruler applied to 2dF quasars
Gary A. Mamon, Boud F. Roukema
Structures on very large scales (> 100 Mpc) have negligible peculiar motions, and are thus roughly fixed in comoving space. We looked for significant peaks at very large separation…
Polar Ring Galaxies and the Tully Fisher relation: implications for the dark halo shape
E. Iodice, M. Arnaboldi, F. Bournaud +4
We have investigated the Tully-Fisher relation for Polar Ring Galaxies (PRGs), based on near infrared, optical and HI data available for a sample of these peculiar objects. The tot…
BeppoSAX observation of the cluster Abell 970
G. B. Lima Neto, H. V. Capelato, L. Sodre +1
We report new results on the cluster of galaxies Abell 970 obtained from X-ray observation with BeppoSAX. Our analysis of the BeppoSAX MECS and LECS data in the range [0.15-10] keV…
VLT/UVES Abundances in Four Nearby Dwarf Spheroidal Galaxies: II. Implications for Understanding Galaxy Evolution
Eline Tolstoy, K. A. Venn, M. Shetrone +4
We have used UVES on VLT-UT2 to take spectra of 15 individual red giant stars in the centers of four nearby dwarf spheroidal galaxies: Sculptor, Fornax, Carina and Leo I. We measur…
VLT/UVES Abundances in Four Nearby Dwarf Spheroidal Galaxies: I. Nucleosynthesis and Abundance Ratios
M. Shetrone, K. A. Venn, E. Tolstoy +3
We have used UVES on VLT-UT2 to take spectra of 15 red giants in the Sculptor, Fornax, Carina and Leo I dwarf spheroidal galaxies. We measure the abundances of alpha, iron peak, s…