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Discovery of a Clustered Quasar Pair at z ~ 5: Biased Peaks in Early Structure Formation
S. G. Djorgovski, D. Stern, A. Mahabal +1
We report a discovery of a quasar at z = 4.96 +- 0.03 within a few Mpc of the quasar SDSS 0338+0021 at z = 5.02 +- 0.02. The newly found quasar has the SDSS i and z magnitudes of ~…
Peculiar Broad Absorption Line Quasars found in DPOSS
Robert J. Brunner, Patrick B. Hall, S. George Djorgovski +10
With the recent release of large (i.e., > hundred million objects), well-calibrated photometric surveys, such as DPOSS, 2MASS, and SDSS, spectroscopic identification of important t…
A Molecular Einstein Ring: Imaging a Starburst Disk Surrounding a Quasi-Stellar Object
C. L. Carilli, G. F. Lewis, S. G. Djorgovski +4
Images of the CO 2-1 line emission, and the radio continuum emission, from the redshift 4.12 gravitationally lensed quasi-stellar object (QSO) PSS J2322+1944 reveal an Einstein rin…
A New Sample of Distant Compact Groups From DPOSS
A. Iovino, R. de Carvalho, R. Gal +4
We have identified eighty-four small, high density groups of galaxies out to z ~ 0.2 in a region of ~ 2000 square degrees around the north galactic pole using DPOSS (the Digitized…
A Limit on the Number of Isolated Neutron Stars Detected in the ROSAT Bright Source Catalog
Robert E. Rutledge, Derek W. Fox, Milan Bogosavljevic +1
The challenge in searching for non-radio-pulsing isolated neutron stars (INSs) is in excluding association with objects in the very large error boxes (~13", 1 sigma radius) typical…
Cosmological Uses of Gamma-Ray Bursts
S. G. Djorgovski, S. R. Kulkarni, D. A. Frail +12
Studies of the cosmic gamma-ray bursts (GRBs) and their host galaxies are starting to provide interesting or even unique new insights in observational cosmology. GRBs represent a n…