14.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Goddard Space Flight CenterUS361 papers
- Marshall Space Flight CenterUS357 papers
- Centre National de la Recherche ScientifiqueFR280 papers
- Max Planck Institute for Extraterrestrial PhysicsDE240 papers
- University of Maryland, College ParkUS239 papers
- Universities Space Research AssociationUS214 papers
- Stanford UniversityUS212 papers
- National Institute for AstrophysicsIT196 papers
- University of Rome Tor VergataIT184 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR179 papers
- University of PaduaIT178 papers
- Istituto Nazionale di Fisica Nucleare, Roma Tor VergataIT175 papers
24 papers · 2 filters
A Single Intrinsic Luminosity Function for Both Type-I and Type-II Active Galactic Nuclei
Shuang Nan Zhang
The luminous electromagnetic emission from distant active galactic nuclei (AGNs) including quasars is believed to be powered by accretion onto super-massive black holes (SMBHs). In…
Study the X-ray Dust Scattering Halos with Chandra Observations of Cygnus X-3 and Cygnus X-1
Jingen Xiang, Shuang Nan Zhang, Yangsen Yao
We improve the method proposed by Yao \emph{et al} (2003) to resolve the X-ray dust scattering halos of point sources. Using this method we re-analyze the Cygnus X-1 data observed…
On the absence of gravitational lensing of the cosmic microwave background
Richard Lieu, Jonathan P. D. Mittaz
The magnification of distant sources by mass clumps at lower () redshifts is calculated analytically. The clumps are initially assumed to be galaxy group isothermal spher…
Average magnification effect of clumping of matter
T. W. B. Kibble, Richard Lieu
The aim of this paper is to re-examine the question of the average magnification in a universe with some inhomogeneously distributed matter. We present an analytic proof, valid und…
INTEGRAL and XMM-Newton Observations of GRB040106
L. Moran, S. Mereghetti, D. Gotz +10
On January 6th 2004, the IBAS burst alert system triggered the 8th gamma-ray burst (GRB) to be located by the INTEGRAL satellite. The position was determined and publicly distribut…
Particle Acceleration, Magnetic Field Generation, and Emission in Relativistic Shocks
K. -I. Nishikawa, P. Hardee, C. B. Hededal +4
Shock acceleration is an ubiquitous phenomenon in astrophysical plasmas. Plasma waves and their associated instabilities (e.g., Buneman, Weibel and other two-stream instabilities)…
Determination Of Electron Flux Spectra In A Solar Flare With An Augmented Regularization Method: Application To Rhessi Data
E. P. Kontar, A. G. Emslie, M. Piana +2
Kontar et al. (2004) have shown how to recover mean source electron spectra in solar flares through a physical constraint regularization analysis of the bremsstrahlung photon spect…
Generalized Regularization Techniques With Constraints For The Analysis Of Solar Bremsstrahlung X-Ray Spectra
E. P. Kontar, M. Piana, A. M. Massone +2
Hard X-ray spectra in solar flares provide knowledge of the electron spectrum that results from acceleration and propagation in the solar atmosphere. However, the inference of the…
WHIM emission and the cluster soft excess: a model comparison
J. Mittaz, R. Lieu, R. Cen +1
The confirmation of the cluster soft excess (CSE) by XMM-Newton has rekindled interest as to its origin. The recent detections of CSE emission at large cluster radii together with…
Particle Acceleration and Magnetic Field Generation in Electron-Positron Relativistic Shocks
K. -I. Nishikawa, P. Hardee, G. Richardson +3
Shock acceleration is an ubiquitous phenomenon in astrophysical plasmas. Plasma waves and their associated instabilities (e.g., Buneman, Weibel and other two-stream instabilities)…
Are the WMAP angular magnification measurements consistent with an inhomogeneous critical density Universe?
R. Lieu, J. P. D. Mittaz
The propagation of light through a Universe of (a) isothermal mass spheres amidst (b) a homogeneous matter component, is considered. We demonstrate by an analytical proof that as l…
Shot cutoff timescales in different spectral states of Cygnus X-1
Hua Feng, Shuang-Nan Zhang, Ti-Pei Li
We investigate the shot cutoff timescale evolutions during different spectral states in the black hole binary Cygnus X-1 with the recently proposed w spectral analysis technique. F…
The GLAST Burst Monitor
Andreas von Kienlin, Charles A. Meegan, Giselher G. Lichti +14
The next large NASA mission in the field of gamma-ray astronomy, GLAST, is scheduled for launch in 2007. Aside from the main instrument LAT (Large-Area Telescope), a gamma-ray tele…
Revealing the X-ray emission processes of old rotation-powered pulsars: XMM-Newton Observations of PSR B0950+08,PSR B0823+26 and PSR J2043+2740
Werner Becker, Martin C. Weisskopf, Allyn F. Tennant +4
We have completed part of a program to study the X-ray emission properties of old rotation-powered pulsars with XMM-Newton in order to probe and identify the origin of their X-radi…
Radio pulsars as progenitors of AXPs and SGRs: magnetic field evolution through pulsar glitches
J. R. Lin, S. N. Zhang
Glitches are common phenomena in pulsars. After each glitch, there is usually a permanent increase in the pulsar's spin-down rate. Therefore a pulsar's present spin-down rate may b…
The Burst and Transient Source Experiment (BATSE) Earth Occultation Catalog of Low-Energy Gamma-Ray Sources
B. A. Harmon, C. A. Wilson, G. J. Fishman +10
The Burst and Transient Source Experiment (BATSE), aboard the Compton Gamma Ray Observatory (CGRO), provided a record of the low-energy gamma-ray sky (20-1000 keV) between 1991 Apr…
Warm gas in the outskirts of galaxy clusters -- The cluster soft excess phenomenon
M. Bonamente, R. Lieu, J. P. D. Mittaz
The cluster soft excess emission indicates the presence of large amounts of warm gas (T ~ 10^6 K) in the neighborhood of galaxy clusters. Among the clusters that display this pheno…
X-ray triple rings around the M87 jets in the central Virgo cluster
Hua Feng, Shuang-Nan Zhang, Yu-Qing Lou +1
The Chandra X-ray data of the central Virgo cluster are re-examined to reveal a triple-ring structure around the galaxy M87, reminiscent of the spectacular triple-ring pattern of t…
XMM-Newton Spectra of Intermediate-Mass Black Hole Candidates: Application of a Monte-Carlo Simulated Model
Q. Daniel Wang, Yangsen Yao, Wakako Fukui +2
We present a systematic spectral analysis of six ultraluminous X-ray sources (NGC1313 X-1/X-2, IC342 X-1, HoIX X-1, NGC5408 X-1 and NGC3628 X-1) observed with XMM-Newton Observator…
XMM-Newton spectra of hard spectrum Rosat AGN: X-ray absorption and optical reddening
F. J. Carrera, M. J. Page, J. P. D. Mittaz
We present the XMM-Newton spectra of three low-redshift intermediate Seyferts (one Sy1.5, and two Sy1.8), from our survey of hard spectrum Rosat sources. The three AGN are well fit…
A General Relativistic Magnetohydrodynamics Simulation of Jet Formation
K. -I. Nishikawa, G. Richardson, S. Koide +4
We have performed a fully three-dimensional general relativistic magnetohydrodynamic (GRMHD) simulation of jet formation from a thin accretion disk around a Schwarzschild black hol…
Markov Chain Monte Carlo joint analysis of Chandra X-ray imaging spectroscopy and Sunyaev-Zeldovich Effect data
Massimiliano Bonamente, Marshall K. Joy, John E. Carlstrom +2
X-ray and Sunyaev-Zeldovich Effect data can be combined to determine the distance to galaxy clusters. High-resolution X-ray data are now available from the Chandra Observatory, whi…
Diagnostics of Neutron Star and Black Hole X-Ray Binaries with X-Ray Shot Widths
H. Feng, T. P. Li, S. N. Zhang
A statistic w, the differential coefficient of the mean absolute difference of an observed lightcurve, is proposed for timescale analysis of shot widths. The shortest width of rand…
A spectrophotometric study of RW Trianguli
Paul J. Groot, Rene G. M. Rutten, Jan van Paradijs
On the basis of spectrophotometric observations we reconstruct the accretion disk of the eclipsing novalike cataclysmic variable RW Tri in the wavelength region 3600-7000 A. We fin…