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50 papers · 1 filter
Making Damped Lyman Alpha Systems in Semi-Analytic Models
Ariyeh H. Maller, Rachel S. Somerville, Jason X. Prochaska +1
The velocity profiles of weak metal absorption lines can be used to observationally probe the kinematic state of gas in damped Lyman-alpha systems. Prochaska and Wolfe have argued…
RR Lyrae Variables in the Globular Cluster M55. The First Evidence for Non Radial Pulsations in RR Lyr Stars
A. Olech, J. Kaluzny, I. B. Thompson +3
We present the results of a photometric study of RR Lyrae variables in the field of the globular cluster M55. We have discovered nine new RR Lyrae stars, increasing the number of k…
Investigating the Metal Line Systems at Z=1.9 toward J2233-606 in the HDF-S
Jason X. Prochaska, Scott M. Burles
The combination of STIS and optical spectroscopy with STIS imaging of the field surrounding J2233-606 afford a unique opportunity to study the physical nature of the Quasar Absorpt…
The HST Key Project on the Extragalactic Distance Scale. XV. A Cepheid Distance to the Fornax Cluster and Its Implications
Barry F. Madore, Wendy L. Freedman, N. Silbermann +13
Using the Hubble Space Telescope (HST) 37 long-period Cepheid variables have been discovered in the Fornax Cluster spiral galaxy NGC 1365. The resulting V and I period-luminosity r…
Quasars and Ultraluminous Infrared Galaxies: At the Limit?
K. K. McLeod, G. H. Rieke, L. J. Storrie-Lombardi
We have detected the host galaxies of 16 nearby, radio-quiet quasars using images obtained with the Near-Infrared Camera and Multi-Object Spectrometer (NICMOS). We confirm that the…
A Polarization Study of Radio Galaxies and Quasars selected from the Molonglo Complete Sample
C. H. Ishwara-Chandra, D. J. Saikia, V. K. Kapahi +1
We present total-intensity and linear-polarization observations made with the Very Large Array at 20 and 6 cm of a representative sample of 42 radio galaxies and quasars selecte…