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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…
Multiple Collimated Outflows in the Proto-planetary Nebula GL 618
Susan R. Trammell, Robert W. Goodrich
We present narrow-band H-alpha, [S II], and [O I] Hubble Space Telescope images of the young planetary nebula GL 618. This object is a compact, bipolar nebula that is currently und…
Giant low surface brightness halos in distant radio galaxies: USS0828+193
M. Villar-Martin, J. Vernet, S. di Serego Alighieri +5
We present results on the spectroscopic study of the ionized gas in the high redshift radio galaxy USS0828+193 at z=2.57. Thanks to the high S/N of the emission lines in the Keck s…
J-Band Spectroscopy of the z = 5.74 BAL QSO SDSSp J104433.04-012502.2
R. W. Goodrich, R. Campbell, F. Chaffee +8
We use the NIRSPEC near-IR spectrometer on Keck II to obtain moderate resolution (R = 1540) spectroscopy that shows conclusively that the C IV emission line in the z = 5.74 quasar…
Beaming in Gamma-Ray Bursts: Evidence for a Standard Energy Reservoir
D. A. Frail, S. R. Kulkarni, R. Sari +11
Gamma-ray bursts (GRBs) are the most brilliant objects in the Universe but efforts to estimate the total energy released in the explosion -- a crucial physical quantity -- have bee…
FOS Observations of Four NLS1s
Robert W. Goodrich
Ultraviolet through optical spectroscopy of four NLS1s shows strong absorption features in the high-ionization UV resonance lines such as C IV, N V, and Si IV. Mg II is not absorbe…
Thomson Thick X-ray Absorption in a Broad Absorption Line Quasar PG0946+301
S. Mathur, P. J. Green, N. Arav +14
We present a deep ASCA observation of a Broad Absorption Line Quasar (BALQSO) PG0946+301. The source was clearly detected in one of the gas imaging spectrometers, but not in any ot…
Polarimetry and Unification of Low-Redshift Radio Galaxies
M. H. Cohen, P. M. Ogle, H. D. Tran +2
We have made high-quality measurements of the polarization spectra of 13 FR II radio galaxies and taken polarization images for 11 of these with the Keck telescopes. Seven of the e…
Polarized Narrow-Line Emission from the Nucleus of NGC 4258
A. J. Barth, H. D. Tran, M. S. Brotherton +5
The detection of polarized continuum and line emission from the nucleus of NGC 4258 by Wilkes et al. (1995) provides an intriguing application of the unified model of Seyfert nucle…
HST Imaging Polarimetry of the Gravitational Lens FSC10214+4724
Hien T. Nguyen, Peter R. Eisenhardt, Michael W. Werner +5
We present imaging polarimetry of the extremely luminous, redshift 2.3 IRAS source FSC10214+4724. The observations were obtained with HST's Faint Object Camera in the F437M filter,…
Below the Lyman Edge: UV Polarimetry of Quasars
Anuradha Koratkar, Robert Antonucci, Robert Goodrich +1
The Lyman edge at 912 Åis an important diagnostic region for studying quasi-stellar objects (QSOs). In particular, it reveals a great deal about the physical conditions within the…
Scattered Radiation from Obscured Quasars in Distant Radio Galaxies
Hien D. Tran, Marshall H. Cohen, Patrick M. Ogle +2
We present optical spectropolarimetric and imaging polarimetric observations of four high-redshift radio galaxies (HzRGs) obtained with the 10-m Keck I telescope. A broad Mg II emi…