Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2.5k papers
- University of MichiganUS2.2k papers
- Brookhaven National LaboratoryUS2.2k papers
- University of California, BerkeleyUS2k papers
- Stony Brook UniversityUS2k papers
- Iowa State UniversityUS1.9k papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR1.9k papers
- University of ChicagoUS1.9k papers
- University of WashingtonUS1.8k papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR1.8k papers
- The University of TokyoJP1.8k papers
- University of ArizonaUS1.8k papers
50 papers · 2 filters
The central engine of gamma-ray bursters
W. Kluzniak, M. Ruderman
GRBs are thought to arise in relativistic blast-wave shocks at distances of 10 to 1000 AU from the point where the explosive energy is initially released. To account for the observ…
Identification of the Periodic Hard X-Ray Transient GRO J1849-03 with the X-Ray Pulsar GS 1843-02 = X1845-024 - a New Be/X-Ray Binary
P. Soffitta, J. A. Tomsick, B. A. Harmon +5
We identify the periodic transient hard X-ray source GRO J1849-03 with the transient x-ray pulsar GS 1843-02 = X1845-024 based on the detection of x-ray outbursts from X1845-024 co…
BeppoSAX observations of Narrow-Line Seyfert 1 galaxies:I. Ton S 180
A. Comastri, F. Fiore, M. Guainazzi +10
We report on the first spectrum up to 10 keV of the bright narrow-line Seyfert 1 galaxy Ton S 180, obtained with the imaging instruments onboard BeppoSAX. This is the first observe…
Hubble Space Telescope Imaging of the Field of GRB970508
E. Pian, A. Fruchter, L. E. Bergeron +15
We report on Hubble Space Telescope observations of the optical transient discovered in the error box of GRB970508. The object was imaged on 1997 June 2 with the Space Telescope Im…
Theory and Statistics of Weak Lensing from Large-Scale Mass Inhomogeneities
Marc Kamionkowski, Arif Babul, Catherine M. Cress +1
Weak lensing by large-scale mass inhomogeneities in the Universe induces correlations in the observed ellipticities of distant sources. We first review the harmonic analysis and st…
A Multiwavelength Investigation of the Relationship Between 2CG135+1 and LSI+61o 303
M. S. Strickman, M. Tavani, M. J. Coe +5
We present the results of a multiwavelength monitoring campaign targeting the gamma-ray source 2CG 135+1 in an attempt to confirm the association of this object with the radio/Be/X…
Models for X-Ray Emission from Isolated Pulsars
F. Y. -H. Wang, M. Ruderman, J. P. Halpern +1
A model is proposed for the observed combination of power-law and thermal emission of keV X-rays from rotationally powered pulsars. For gamma-ray pulsars with accelerators very man…
Spectral Properties of the Prompt X-ray emission and Afterglow from the Gamma-Ray Burst of 28 February 1997
F. Frontera, E. Costa, L. Piro +18
We report high-energy spectral data of the prompt emission of GRB970228 and its X-ray afterglow. We establish that the nature of the X-ray afterglow emission is non-thermal and sim…
Probing Density Fluctuations using the FIRST Radio Survey
C. M. Cress, FIRST collaboration
We use results of angular clustering measurements in 3000 sq. deg's of the FIRST radio survey to infer information on spatial clustering. Measurements are compared with CDM-model p…
The Proper Motion of NGC 6522 in Baade's Window
Donald M. Terndrup, Piotr Popowski, Andrew Gould +2
We have detected seven stars with a common proper motion which are located within 2.5 arcminutes of the globular cluster NGC 6522 in the Baade's Window field of the Galactic bulge.…
Hubble Space Telescope Imaging of the Optical Transient Associated with GRB970508
Elena Pian, Andrew S. Fruchter, Louis E. Bergeron +15
We report on Hubble Space Telescope (HST) observations of the optical transient (OT) discovered in the error box of the gamma-ray burst GRB970508. The object was imaged on 1997 Jun…
Ly alpha Cloud Size Evolution and Shape from QSO Groups
Arlin Crotts
We present results from Keck HIRES, KPNO 4m/RC Spec and HST FOS spectra of a low-redshift, close QSO pair and a close, higher-redshift QSO triplet in order to explore the size evol…
Spectral Implications of Variability in GRB Fireballs
Ravi P. Pilla, Abraham Loeb
Cosmological -ray bursts originate from relativistic winds. Temporal fluctuations in the wind velocity can give rise to internal shocks which dissipate a significant fraction of…
Emission Spectra from Internal Shocks in Gamma-Ray-Burst Sources
Ravi Pilla, Abraham Loeb
Unsteady activity of gamma-ray burst sources leads to internal shocks in their emergent relativistic wind. We study the emission spectra from such shocks, assuming that they produc…
The First FIRST Gravitationally Lensed Quasar: FBQ 0951+2635
Paul L. Schechter, Michael D. Gregg, Robert H. Becker +2
The V=16.9 quasar FBQ 0951+2635 at redshift z=1.24 appears double on CCD exposures taken in subarcsecond seeing. The two objects are separated by 1.1" and differ in brightness by 0…
Kilo-hertz QPO and X-ray Bursts in 4U 1608-52 in Low Intensity State
W. Yu, S. N. Zhang, B . A. Harmon +8
We present the results from RXTE/PCA observations of 4U 1608-52 in its island state on March 15, 18 and 22 of 1996. Three type I X-ray bursts were detected in one RXTE orbit on Mar…
Kilo-hertz QPO in Island State of 4U1608-52 as Observed with RXTE/PCA
W. Yu, S. N. Zhang, B . A. Harmon +8
We report RXTE/PCA observations of 4U 1608-52 on March 15, 18 and 22 immediately after the outburst in early 1996. The persistent count rates ranged from 190 to 450 cps (1-60 keV).…
Long-Term Flux Monitoring of LSI +61 303 at 2.25 and 8.3 GHz
P. S. Ray, R. S. Foster, E. B. Waltman +2
LSI +61 303 is an exotic binary system consisting of a ~10 Msun B star and a compact object which is probably a neutron star. The system is associated with the interesting radio so…
Evidence for a late-time outburst of the X-ray afterglow of GB970508 from BeppoSAX
L. Piro, L. Amati, L. A. Antonelli +15
The gamma-ray burst GB970508 was observed simultaneously by the Gamma Ray Burst Monitor (GRBM) and one of the X-ray Wide Field Cameras (WFC) aboard BeppoSAX. The latter provided a…
Optical Light Curves of the Type Ia Supernovae 1990N and 1991T
P. Lira, Nicholas B. Suntzeff, M. M. Phillips +27
We present UBVRI light curves for the bright Type Ia supernovae SN 1990N in NGC 4639 and SN 1991T in NGC 4527 based on photometry gathered in the course of the Calan/Tololo superno…
An X-Ray Dip in the X-Ray Transient 4U 1630-47
J. A. Tomsick, I. Lapshov, P. Kaaret
An x-ray dip was observed during a 1996 Rossi X-Ray Timing Explorer observation of the recurrent x-ray transient 4U 1630-47. During the dip, the 2-60 keV x-ray flux drops by a fact…
Constraining Omega_0 With The Angular-Size Redshift Relation Of Double-Lobed Quasars In The FIRST Survey
Ari Buchalter, David J. Helfand, Robert H. Becker +1
In previous attempts to measure Omega_0 from the angular size-redshift (theta-z) relation of double-lobed radio sources, the observed data have been consistent with a static Euclid…
The Optical Polarization and Warm Absorber in IRAS 17020+4544
Karen M. Leighly, Laura E. Kay, Beverley J. Wills +2
We report the detection of ionized absorption in the ASCA spectrum of the narrow-line Seyfert 1 galaxy IRAS 17020+4544. Subsequent optical spectropolarimetry revealed high polariza…
Neutron star magnetic field evolution, crust movement and glitches
Malvin Ruderman, Tianhua Zhu, Kaiyou Chen
Spinning superfluid neutrons in the core of a neutron star interact strongly with co-existing superconducting protons. One consequence is that the outward(inward) motion of core su…