Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Harvard UniversityUS3.4k papers
- California Institute of TechnologyUS2.8k papers
- Centre National de la Recherche ScientifiqueFR2.4k papers
- University of California, BerkeleyUS2k papers
- Massachusetts Institute of TechnologyUS2k papers
- University of ArizonaUS1.9k papers
- Goddard Space Flight CenterUS1.6k papers
- Space Telescope Science InstituteUS1.6k papers
- Princeton UniversityUS1.5k papers
- Max Planck Institute for AstronomyDE1.4k papers
- Max Planck Institute for Extraterrestrial PhysicsDE1.4k papers
- University of MichiganUS1.3k papers
245 papers · 1 filter
The ROSAT Brightest Cluster Sample (BCS) - I. The compilation of the sample and the cluster log N-log S distribution
H. Ebeling, A. C. Edge, H. Böhringer +5
We present a 90 per cent flux-complete sample of the 201 X-ray brightest clusters of galaxies in the northern hemisphere (dec > 0 deg), at high Galactic latitudes (|b| > 20 deg), w…
Resonant Absorption in the AGN spectra emerging from photoionized gas: differences between steep and flat ionizing continua
Fabrizio Nicastro, Fabrizio Fiore, Giorgio Matt
We present photoionization models accounting for both photoelectric and resonant absorption. Resonance absorption lines from C, O, Ne, Mg, Si S and Fe between 0.1 and 10 keV are tr…
Dust Versus Cosmic Acceleration
Anthony N. Aguirre
Two groups have recently discovered a statistically significant deviation in the fluxes of high-redshift type Ia supernovae from the predictions of a Friedmann model with zero cosm…
High-precision calculations of dispersion coefficients, static dipole polarizabilities, and atom-wall interaction constants for alkali-metal atoms
A. Derevianko, W. R. Johnson, M. S. Safronova +1
The van der Waals coefficients for the alkali-metal atoms from Na to Fr interacting in their ground states, are calculated using relativistic ab initio methods. The accuracy of the…
A Mid-Infrared Imaging Survey of Proto-Planetary Nebula Candidates
Margaret Meixner, Toshiya Ueta, Aditya Dayal +6
We present the data from a mid-infrared imaging survey of 66 proto-planetary nebula candidates using two mid-IR cameras (MIRAC2 and Berkcam) at the NASA Infrared Telescope Facility…
Measurement of Hard Lags and Coherences in the X-Ray Flux of Accreting Neutron Stars and Comparison with Accreting Black Holes
Eric C. Ford, Michiel van der Klis, Mariano Mendez +2
Using the Rossi X-ray Timing Explorer we have measured lags of the 9 to 33 keV photons relative to the 2 to 9 keV photons in the timing noise between 0.01 and 100 Hz in the accreti…
The HST Key Project on the Extragalactic Distance Scale. XV. A Cepheid Distance to the Fornax Cluster and Its Implications
Barry F. Madore, Wendy L. Freedman, N. Silbermann +13
Using the Hubble Space Telescope (HST) 37 long-period Cepheid variables have been discovered in the Fornax Cluster spiral galaxy NGC 1365. The resulting V and I period-luminosity r…
Self-Organized States in Cellular Automata: Exact Solution
M. V. Medvedev, P. H. Diamond
The spatial structure, fluctuations as well as all state probabilities of self-organized (steady) states of cellular automata can be found (almost) exactly and {\em explicitly} fro…
Rotation periods of late-type stars in the young open cluster IC 2602
Sydney A. Barnes, Sabatino Sofia, Charles F. Prosser +1
We present the results of a monitoring campaign aimed at deriving rotation periods for a representative sample of stars in the young (30 Myr) open cluster IC 2602. Rotation periods…
Extended X-ray emission from the BL Lac object PKS 0521-365
M. J. Hardcastle, D. M. Worrall, M. Birkinshaw
Models that seek to unify BL Lacs and low-power radio galaxies predict that the two types of object should show similar isotropically emitted X-ray emission. Testing this is usuall…
On the Origin of the Hard X-Ray Background
T. Di Matteo, A. Esin, A. C. Fabian +1
Several models for the hard X-ray Background (XRB) suggest that it is due to the emission from heavily obscured AGN. Recent studies have revealed the presence of a new population o…
Mrk421: EUVE observations from 1994 to 1997
Ilaria Cagnoni, Antonella Fruscione, Iossif E. Papadakis
We present spectral and timing analysis of all the data collected by the Extreme Ultraviolet Explorer for the BL Lac object Mrk 421 from 1994 to 1997. During these years Mrk 421 ha…
Principles and Demonstrations of Quantum Information Processing by NMR Spectroscopy
T. F. Havel, S. S. Somaroo, C. -H. Tseng +1
This paper surveys our recent research on quantum information processing by nuclear magnetic resonance (NMR) spectroscopy. We begin with a geometric introduction to the NMR of an e…
Physics of the Merging Clusters Cygnus A, A3667, and A2065
M. Markevitch, C. L. Sarazin, A. Vikhlinin
We present ASCA gas temperature maps of the nearby merging galaxy clusters Cygnus A, A3667, and A2065. Cygnus A appears to have a particularly simple merger geometry that allows an…
An Asca Study of the Supernova Remnant G39.2-0.3
I. M. Harrus, P. O. Slane
We present the analysis of archival data from the Advanced Satellite for Cosmology and Astrophysics} (ASCA) of the supernova remnant (SNR) G39.2-0.3. G39.2-0.3 has been sometimes c…
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…
Thermal X-Ray Line Emission from Accreting Black Holes
Ramesh Narayan, John Raymond
We present model X-ray spectra of accreting black holes with advection-dominated accretion flows, paying attention to thermal emission lines from the hot plasma. We show that the A…
Models for High-Redshift Lyman Alpha Emitters
Zoltan Haiman, Marco Spaans
We present models for dusty high-redshift Lyman alpha emitting galaxies by combining the Press-Schechter formalism with a treatment of inhomogeneous dust distribution inside galaxi…
Empirical Constraints on the First Stars and Quasars
Zoltan Haiman, Avi Loeb
Empirical studies of the first generation of stars and quasars in the Universe will likely become feasible over the next decade. The Next Generation Space Telescope will provide di…
Group Identification in N-Body Simulations: SKID and DENMAX Versus Friends-of-Friends
M. Goetz, J. P. Huchra, R. H. Brandenberger
Three popular algorithms (FOF, DENMAX, and SKID) to identify halos in cosmological N-body simulations are compared with each other and with the predicted mass function from Press-S…
Intrinsic Size and Shape of Sgr A*: 3.6 AU by <1 AU
K. Y. Lo, Z. -Q. Shen, J. -H. Zhao +1
By means of near-simultaneous multi-wavelength VLBA measurements, we determine for the first time the intrinsic size of Sgr A* to be 3.6 AU by <1 AU with the major axis oriented es…
Imaging Circumstellar Debris Disks
Ray Jayawardhana
I briefly review recent developments in the study of circumstellar debris disks, particularly at infrared and sub-millimeter wavelengths, and discuss possible avenues of research f…
Kinematic Effects of Tidal Interaction on Galaxy Rotation Curves
Elizabeth J. Barton, Benjamin C. Bromley, Margaret J. Geller
We use self-consistent N-body models, in conjunction with models of test particles moving in galaxy potentials, to explore the initial effects of interactions on the rotation curve…
Coexisting conical bipolar and equatorial outflows from a high-mass protostar
L. J. Greenhill, C. R. Gwinn, C. Schwartz +2
The BN/KL region in the Orion molecular cloud is an archetype in the study of the formation of stars much more massive than the Sun. This region contains luminous young stars and p…