Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Chinese Academy of SciencesCN5.9k papers
- University of Chinese Academy of SciencesCN2.2k papers
- Peking UniversityCN1.2k papers
- Centre National de la Recherche ScientifiqueFR759 papers
- Yunnan ObservatoriesCN679 papers
- Shanghai Astronomical ObservatoryCN633 papers
- Beijing Normal UniversityCN629 papers
- Purple Mountain ObservatoryCN616 papers
- Tsinghua UniversityCN578 papers
- Kavli Institute for Theoretical SciencesCN552 papers
- Nanjing UniversityCN462 papers
- Center for Astrophysics Harvard & SmithsonianUS455 papers
39 papers · 2 filters
Baryon Distribution in Galaxy Clusters as a Result of Sedimentation of Helium Nuclei
Bo Qin, Xiang-Ping Wu
Heavy particles in galaxy clusters tend to be more centrally concentrated than light ones according to the Boltzmann distribution. An estimate of the drift velocity suggests that i…
Chemical composition of 90 F and G disk dwarfs
Y. Q. Chen, P. E. Nissen, G. Zhao +2
High resolution, high S/N spectra have been obtained for a sample of 90 F and G main-sequence disk stars covering the metallicity range -1.0 < [Fe/H] < +0.1, and have been analysed…
Sc and Mn abundances in disk and metal-rich halo stars
P. E. Nissen, Y. Q. Chen, W. J. Schuster +1
Sc and Mn abundances are determined for 119 F and G main-sequence stars with -1.4 < [Fe/H] < +0.1, representing stars from the thin disk, the thick disk and the halo. The results i…
The evolution of beamed GRB afterglow: non-relativistic case
D. M. Wei, T. Lu
There has been increasing evidence that at least some GRBs are emission beamed. The beamed GRB afterglow evolution has been discussed by several authors in the ultra-relativistic c…
Correlation Between the Halo Concentration (c) and the Virial Mass (Mvir) Determined from X-ray Clusters
Xiang-Ping Wu, Yan-Jie Xue
Numerical simulations of structure formation have suggested that there exists a good correlation between the halo concentration c (or the characteristic density delta_c) and the vi…
Stellar Populations in Blue Compact Galaxies
X. Kong, F. Z. Cheng
Blue compact galaxies (BCGs) are compact galaxies that are dominated by intense star formation. Comparing the observational properties with the predictions of stellar population sy…
ASCA/ROSAT Observations of PKS 2316-423: Spectral Properties of a Low Luminosity Intermediate-type BL Lac Object
S. -J. Xue, Y. -H. Zhang
We present the analysis of archival data from ROSAT and ASCA of a serendipitous source PKS 2316-423. According to its featureless non-thermal radio/optical continuum, the object ha…
An inverse Compton scattering (ICS) model of pulsar emission: III. polarization
R. X. Xu, J. F. Liu, J. L. Han +1
Qiao and his collaborators recently proposed an inverse Compton Scattering (ICS) model to explain radio emission of pulsars. In this paper, we investigate the polarization properti…
Period Measurement of AGB Stars in the Outer Galactic Disk
Jun-ichi Nakashima, B. W. Jiang, Shuji Deguchi +2
Light variation of the 47 AGB star candidates in the outer Galactic disk has been monitored at I-band for 5 years. Periods were determined well for 18 of them and less reliably for…
Virialization of Galaxy Clusters and Beyond
Wen Xu, Li-Zhi Fang, Xiang-Ping Wu
Using samples of structures identified by a multi-scale decomposition from numerical simulation, we analyze the scale-dependence of the virialization of clusters. We find that beyo…
The Star Formation Histories of Two Northern LMC Fields
A. E. Dolphin
Ground-based UBV photometry of two fields in the northern disk of the LMC are presented. A distance modulus of (m-M)_0 = 18.41 +/- 0.04 and an extinction of A_V = 0.30 +/- 0.05 has…
DQ Herculis in Profile: Whole Earth Telescope Observations and Smoothed Particle Hydrodynamics Simulations
M. A. Wood, the XCov 15 Team
DQ Herculis was the Summer 1997 WET northern-hemisphere primary target. The O-C phase diagram of the 71-s signal reveals out-of-eclipse phase variations resulting from the self ecl…
The broad Fe K line profile in NGC 4151
Junxian. Wang, Youyuan. Zhou, Tinggui. Wang
We present an analysis of the Fe K line profile of NGC 4151 by using long ASCA observation data obtained in May 1995. The unprecedented good data quality, which is much better in t…
Constraints on the Asymptotic Baryon Fractions of Galaxy Clusters at Large Radii
Xiang-Ping Wu, Yan-Jie Xue
While X-ray measurements have so far revealed an increase in the volume-averaged baryon fractions of galaxy clusters with cluster radii , should asymptotically…
Breaking Degeneracy of Dark Matter Models by the Scale-Scale Correlations of Galaxies
Long-long Feng, Zu-Gan Deng, Li-Zhi Fang
Recently, scale-scale correlations have been detected in the distributions of quasar's Ly absorption lines and the maps of cosmic temperature fluctuations. In this paper, we inv…
Optical Spectral Signatures of Dusty Starburst Galaxies
B. M. Poggianti, H. Wu
We analyse the optical spectral properties of the complete sample of Very Luminous Infrared Galaxies presented by Wu et al. (1998a,b) and we find a high fraction (~50 %) of spectra…
Electric Character of Strange Stars
R. X. Xu, G. J. Qiao
Using the Thomas-Fermi model, we investigated the electric characteristics of a static non-magnetized strange star without crust in this paper. The exact solutions of electron numb…
Can the jet steepen the light curves of GRB afterglow?
D. M. Wei, T. Lu
Beaming of relativistic ejecta in GRBs has been postulated by many authors in order to reduce the total GRB energy, thus it is very important to look for the observational evidence…
Helium abundance in the most metal-deficient blue compact galaxies: I Zw 18 and SBS 0335-052
Y. I. Izotov, F. H. Chaffee, C. B. Foltz +3
We present high-quality spectroscopic observations of the two most-metal deficient blue compact galaxies known, I Zw 18 and SBS 0335-052 to determine the helium abundance. The unde…
PSR 0943+10: a bare strange star?
R. X. Xu, G. J, . Qiao +1
Recent work by Rankin & Deshpande strongly suggests that there exist strong ``micro-storms'' rotating around the magnetic axis of the 1.1s pulsar PSR 0943+10. Such a feature hints…
The Risetime of Nearby Type Ia Supernovae
Adam G. Riess, Alexei V. Filippenko, Weidong Li +7
We present calibrated photometric measurements of the earliest detections of nearby type Ia supernovae (SNe Ia). The set of ~30 new, unfiltered CCD observations delineate the early…
Helical motions in the jet of blazar 1156+295
X. Y. Hong, D. R. Jiang, L. I. Gurvits +3
The blazar 1156+295 was observed by VLBA and EVN + MERLIN at 5 GHz in June 1996 and February 1997 respectively. The results show that the jet of the source has structural oscillati…
A Possible Energy Mechanism for Cosmological Gamma-ray Bursts
K. S. Cheng, Y. Lu
We suggest that an extreme Kerr black hole with a mass , a dimensionless angular momentum and a marginal stable orbital radius $r_{ms}\sim 3r_s\sim 10^{…
The young age of the extremely metal-deficient blue compact dwarf galaxy SBS 1415+437
T. X. Thuan, Y. I. Izotov, C. B. Foltz
We use Multiple Mirror Telescope (MMT) spectrophotometry and Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) spectra and Wide Field and Planetary Camera 2 (WFPC2) V an…