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255 papers · 1 filter
Evolution of the Ionizing Background and the Epoch of Reionization from the Spectra of z~6 Quasars
Xiaohui Fan, Vijay K. Narayanan, Michael A. Strauss +4
We study the process of cosmic reionization and estimate the ionizing background in the IGM using the Lyman series absorption in the spectra of the four quasars at 5.7<z<6.3 discov…
Luminosities of [O III] and Hydrogen Balmer lines in nova shells years and decades after outburst
Ronald A. Downes, Hilmar W. Duerbeck, Catherine E. Delahodde
The evolution of the luminosity of nova shells in the century following the nova outburst is studied for the lines H-alpha, H-beta, and [O III]. About 1200 flux measurements from 9…
Testing the line-driven disk wind model: time-resolved UV spectroscopy of IX Vel and V3885 Sgr
L. E. Hartley, J. E. Drew, K. S. Long +2
To confront the predictions of the most recent line-driven disk wind models with observational evidence, we have obtained HST STIS (1180--1700A) echelle spectra of the nova-like va…
Distant Cluster Hunting I: A Comparison Between the Optical and X-ray Luminosity Functions from an Optical/X-ray Survey
Megan Donahue, Jennifer Mack, Caleb Scharf +6
We present a comparison of X-ray and optical luminosities and luminosity functions of cluster candidates from a joint optical/X-ray survey, the ROSAT Optical X-Ray Survey. Complete…
Distant Cluster Hunting II: A comparison of X-ray and optical cluster detection techniques and catalogs from the ROX Survey
Megan Donahue, Caleb Scharf, Jennifer Mack +6
We present and analyze the optical and X-ray catalogs of moderate-redshift cluster candidates from the ROSAT Optical X-ray Survey, or ROXS. The survey covers 4.8 square degrees (23…
Abundances of Deuterium, Oxygen, and Nitrogen in the Local Interstellar Medium: Overview of First Results from the Far Ultraviolet Spectroscopic Explorer Mission
H. W. Moos, K. R. Sembach, A. Vidal-Madjar +33
Observations obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) have been used to determine the column densities of D I, O I, and N I along seven sight lines that prob…