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213 papers · 1 filter
The Formation of Star Clusters
Bradley C. Whitmore
The ability of HST to resolve objects ten times smaller than possible from the ground has rejuvenated the study of young star clusters. A recurrent morphological theme found in nea…
Long-term Optical Variability of Radio-Selected Quasars from the FIRST Survey
David J. Helfand, Remington P. S. Stone, Beth Willman +5
We have obtained single-epoch optical photometry for 201 quasars, taken from the FIRST Bright Quasar Survey, which span a wide range in radio loudness. Comparison with the magnitud…
Clustering Segregation With UV Luminosity in Lyman-Break Galaxies at z~3 and Its Implications
Mauro Giavalisco, Mark Dickinson
We report on the clustering properties of Lyman-break galaxies (LBGs) at z~3. The correlation length of flux-limited samples of LBGs depends on their rest-frame ultraviolet (UV) lu…
Ultraviolet Line Spectra of Metal-Poor Star-Forming Galaxies
Claus Leitherer, Joao Leao, Tim Heckman +3
We present synthetic ultraviolet spectra of metal-poor star-forming galaxies which were calculated with the Starburst99 package. A new spectral library was generated from HST obser…
Mining the Blazar Sky
Paolo Padovani, Paolo Giommi
We present the results of our methods to "mine" the blazar sky, i.e., select blazar candidates with very high efficiency. These are based on the cross-correlation between public ra…
The Deep X-ray Radio Blazar Survey (DXRBS). II. New Identifications
H. Landt, P. Padovani, E. Perlman +3
We have searched the archived, pointed ROSAT Position Sensitive Proportional Counter data for blazars by correlating the WGACAT X-ray database with several publicly available radio…