Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of California, BerkeleyUS1.3k papers
- Goddard Space Flight CenterUS1.3k papers
- California Institute of TechnologyUS1.3k papers
- The Ohio State UniversityUS1.2k papers
- Centre National de la Recherche ScientifiqueFR1.1k papers
- Massachusetts Institute of TechnologyUS1.1k papers
- University of Maryland, College ParkUS1k papers
- Center for Astrophysics Harvard & SmithsonianUS975 papers
- Lawrence Berkeley National LaboratoryUS897 papers
- University of ChicagoUS889 papers
- University of WashingtonUS868 papers
- Yale UniversityUS848 papers
72 papers · 2 filters
ASCA Observations of GRO J1744-28
M. Nishiuchi, K. Koyama, Y. Maeda +7
We report the ASCA results of the bursting X-ray pulsar \gro, which was observed in February 1996 and March 1997. The source flux in the 2--10 keV band was erg/s…
Isophot Observations of Comet Hale-Bopp: Initial Data Reduction
E. Grün, S. B. Peschke, M. Stickel +17
Comet Hale-Bopp was observed five times with ISOPHOT, the photometer on board the Infrared Space Observatory (ISO). Each time broadband photometry was performed using 4 different d…
The Circumstellar Extinction of Planetary Nebulae
Robin Ciardullo, George H. Jacoby
We analyze the dependence of circumstellar extinction on core mass for the brightest planetary nebulae (PNe) in the Magellanic Clouds and M31. We show that in all three galaxies, a…
Chemical Abundances of Planetary Nebulae in the Bulge and Disk of M31
George H. Jacoby, Robin Ciardullo
We derive abundances and central star parameters for 15 planetary nebulae (PNe) in M31: 12 in the bulge and 3 in a disk field 14 kpc from the nucleus. No single abundance value cha…
Three contributions to Galaxy Dynamics: distant galaxy kinematics, mass, and M/L
M. A. Bershady, A. Jangren, D. R. Andersen +3
1) Rotation Curves and M/L Evolution for Galaxies to z=0.4, (Bershady, Haynes, Giovanelli, & Andersen) 2) Mass Estimates of Starbursting Galaxies: Line Widths versus Near-IR Lumino…
Distortion of Globular Clusters by Galactic Bulges
Holly K. Nordquist, Robert J. Klinger, Pablo Laguna +1
One of the external fields that influences the population of globular clusters is that due to galactic bulges. In extreme situations, perigalactic distances pc, globu…
Afterglows from Gamma-ray Bursts
P. Meszaros
The successful discovery of X-ray, optical and radio afterglows of gamma-ray bursts has significantly helped our understanding of these sources, and made possible the identificatio…
Optical and UV observations of a strong flare in the young, single K2-dwarf LQ Hya
D. Montes, S. H. Saar, A. Collier Cameron +1
We present high resolution optical echelle spectra and IUE observations during a strong flare on 1993 December 22 in the very active, young, rapidly rotating, single K2 dwarf LQ Hy…
The Post-Common Envelope and Pre-Cataclysmic Binary PG 1224+309
Jerome A. Orosz, Richard A. Wade, Jason J. B. Harlow +3
We have made extensive spectroscopic and photometric observations of PG 1224+309, a close binary containing a DA white dwarf primary and an M4+ secondary. The H alpha line is in em…
One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays
G. Matt, M. Guainazzi, R. Maiolino +11
The Circinus Galaxy has been observed, for the first time above 10 keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1--10 keV spectrum is apparent in…
X-ray Pulsations from the Central Source in Puppis A
G. G. Pavlov, V. E Zavlin, J. Truemper
There are several supernova remnants which contain unresolved X-ray sources close to their centers, presumably radio-quiet neutron stars. To prove that these objects are indeed neu…
Cosmic Rays and Neutrinos from Gamma Ray Bursts
Jorg P. Rachen, P. Meszaros
We review the hypothesis that the acceleration of protons at internal shocks in Gamma Ray Bursts (GRB) could be the origin of the ultra-high energy cosmic rays (UHECR) observed at…
ASCA Observations of Radio-Loud AGNs
Rita Sambruna, Michael Eracleous, Richard Mushotzky
We summarize the results of an X-ray spectroscopic survey of radio-loud AGNs observed with ASCA, using proprietary and archival data (public up to 1998 September). We briefly compa…
The ROSAT Deep Survey IV. A distant lensing cluster of galaxies with a bright arc
G. Hasinger, R. Giacconi, J. E. Gunn +7
An unusual double-lobed extended X-ray source (RX J105343+5735) is detected in the ROSAT ultra-deep HRI image of the Lockman Hole. The angular size of the source is 1.7 X 0.7 arcmi…
ASCA and contemporaneous ground-based observations of the BL Lacertae objects 1749+096 and 2200+420 (BL Lac)
Rita M. Sambruna, G. Ghisellini, Eric Hooper +3
We present ASCA observations of the radio-selected BL Lacertae objects 1749+096 (z=0.32) and 2200+420 (BL Lac, z=0.069) performed in 1995 Sept and Nov, respectively. The ASCA spect…
The Thermal X-ray Spectra of Cen X-4, Aql X-1, and 4U 1608-522 in Quiescence
R. E. Rutledge, L. Bildsten, E. F. Brown +2
We re-analyze the available X-ray spectral data of the type I bursting neutron star transients Aql X-1, Cen X-4, and 4U 1608-522 using realistic hydrogen atmosphere models. Previou…
Hydrodynamical Simulations of Gamma Ray-Bursts from Internal Shocks in Relativistic Fireballs
A. Panaitescu, P. Meszaros
We simulate the dynamics of the interaction between relativistically expanding spherically symmetric shells using a 1-dimensional hydrodynamic code and calculate spectra and light-…
Li I enhancement during a long-duration stellar flare
David Montes, Lawrence W. Ramsey
We report the possible detection of a Li I 6708 AA line enhancement during an unusual long-duration optical flare in the recently discovered, X-ray/EUV selected, chromospherically…
Using weak MgII lines to chart Low Surface Brightness Galaxies
V. Le Brun, C. W. Churchill
We report the detection, based on HST and Keck data, of two peculiar absorbers in the Ly-alpha forest of the quasar PKS 0454+039. These clouds, at redshifts z=0.6248 and 0.9315 res…
Simulations of LyαAbsorption from Low Surface Brightness Galaxies
Suzanne M. Linder
Using simulations of the low redshift galaxy population based upon galaxy observations, it is shown (Linder 1998) that the majority of Ly absorbers at low redshift could arise i…
Multiwavelength optical observations of the chromospherically active binary system MS Ser
J. Sanz-Forcada, D. Montes, M. J. Fernandez-Figueroa +2
We present here a continuation of our ongoing project of multiwavelength optical observations aimed at studying the chromosphere of active binary systems using the information prov…
A long-duration flare in the X-ray/EUV selected chromospherically active binary 2RE J0743+224
D. Montes, L. W. Ramsey
2RE J0743+224 (BD +23 1799) is a chromospherically active star selected by X-rays and EUV emission detected in the Einstein Slew Survey and ROSAT Wide Field Camara (WFC) all sky su…
Chromospheric activity of ROSAT discovered weak-lined T Tauri stars
D. Montes, L. W. Ramsey
We have started a high resolution optical observation program dedicated to the study of chromospheric activity in weak-lined T Tauri stars (WTTS) recently discovered by the ROSAT A…
The Sloan Digital Sky Survey Photometric Camera
J. Gunn, M. Carr, C. Rockosi +1
We have constructed a large format mosaic CCD camera for the Sloan Digital Sky Survey. The camera consists of two arrays, a photometric array which uses 30 2048 x 2048 SITe/Tektron…