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Searches for Rare and New Types of Objects
S. G. Djorgovski, A. A. Mahabal, R. J. Brunner +4
Systematic exploration of the observable parameter space, covered by large digital sky surveys spanning a range of wavelengths, will be one of the primary modes of research with a…
Exploring the Multi-Wavelength, Low Surface Brightness Universe
R. J. Brunner, S. G. Djorgovski, R. R. Gal +2
Our current understanding of the low surface brightness universe is quite incomplete, not only in the optical, but also in other wavelength regimes. As a demonstration of the type…
Groups and clusters detection on DPOSS catalogs
E. Puddu, E. De Filippis, V. Strazzullo +5
We discuss the implementation and validation of a procedure aimed to detect groups and clusters of galaxies in DPOSS catalogs.
Mass-to-Light Ratios of Groups and Clusters of Galaxies
V. Hradecky, C. Jones, R. H. Donnelly +3
We constrain the mass-to-light ratios, gas mass fractions, baryon mass fractions and the ratios of total to luminous mass for a sample of eight nearby relaxed galaxy groups and clu…
The Palomar Abell Cluster Optical Survey I: Photometric Redshifts for 431 Abell Clusters
R. R. Gal, R. R de Carvalho, R. Brunner +2
This paper presents photometric redshifts for 431 Abell clusters imaged as part of the Palomar Abell Cluster Optical Survey (PACOS), of which 236 are new redshi fts. We have obtain…
Tests of the Accelerating Universe with Near-Infrared Observations of a High-Redshift Type Ia Supernova
Adam G. Riess, Alexei V. Filippenko, Michael C. Liu +25
We have measured the rest-frame B,V, and I-band light curves of a high-redshift type Ia supernova (SN Ia), SN 1999Q (z=0.46), using HST and ground-based near-infrared detectors. A…