43 citations · 173 across the 15 of their papers we have counts for
15 papers
A Chandra Survey of Milky Way Globular Clusters -- IV. Periodic X-ray sources
Tong Bao, Zhiyuan Li, Zhongqun Cheng +1
We present a systematic search for periodic X-ray sources in 10 Galactic globular clusters (GCs) utilizing deep archival Chandra observations. By applying the Gregory-Loredo algori…
A Fermi-LAT Study of Globular Cluster Dynamical Evolution in the Milky Way: Millisecond Pulsars as the Probe
Li Feng, Zhongqun Cheng, Wei Wang +2
Using archival {\it Fermi}-LAT data with a time span of years, we study the population of Millisecond Pulsars (MSPs) in Globular Clusters (GlCs) and investigate their depe…
Periodic X-ray sources in the Massive Globular Cluster 47 Tucanae: Evidence for Dynamically Formed Cataclysmic Variables
Tong Bao, Zhiyuan Li, Zhongqun Cheng
We present a systematic study of periodic X-ray sources in the massive globular cluster 47 Tuc, utilizing deep archival Chandra observations that resolve the cluster core and recen…
A Chandra Survey of Milky Way Globular Clusters. III. Searching for X-ray Signature of Intermediate-mass Black Holes
Zhao Su, Zhiyuan Li, Meicun Hou +2
Globular clusters (GCs) are thought to harbor the long-sought population of intermediate-mass black holes (IMBHs). We present a systematic search for a putative IMBH in 81 Milky Wa…
Discovery of Galaxy Clusters and a Head-Tail Radio Galaxy in the Direction of Globular Cluster NGC 6752
Zhongqun Cheng, Xiaohui Sun, Wei Wang +1
We report the discovery of CXOU J191100-595621 and CXOU J191012-595619, two galaxy clusters serendipitously detected in the direction of globular cluster NGC 6752, based on archiva…
Exploring the Mass Segregation Effect of X-ray Sources in Globular Clusters. IV. Evidence of Black Hole Burning in Centauri
Zhongqun Cheng, Zhiyuan Li, Wei Wang +2
Using X-ray sources as sensitive probes of stellar dynamical interactions in globular clusters (GCs), we study the mass segregation and binary burning processes in Cen. We show…
Testing Comptonization as the origin of the continuum in nonmagnetic Cataclysmic Variables. The photon index of X-ray emission
T. Maiolino, L. Titarchuk, F. D'Amico +4
X-ray spectra of nonmagnetic cataclysmic variables (nmCVs) in the ~ 0.315 keV energy band have been described either by one or several optically thin thermal plasma components,…
Exploring the Mass Segregation Effect of X-ray Sources in Globular Clusters. III. Signs of Binary Disruption in M28
Zhongqun Cheng, Huijun Mu, Zhiyuan Li +3
Using archival {\it Chandra} observations with a total effective exposure of 323 ks, we derive an updated catalog of point sources in the bulge globular cluster M28. The catalog co…
Exploring the Mass Segregation Effect of X-ray Sources in Globular Clusters. II. The Case of Terzan 5
Zhongqun Cheng, Zhiyuan Li, Taotao Fang +2
Using archival {\it Chandra} observations with a total effective exposure of 734 ks, we derive an updated catalog of point sources in the massive globular cluster Terzan 5. Our cat…
Massive White Dwarfs in the Galactic Center: A Chandra X-ray Spectroscopy of Cataclysmic Variables
Xiao-jie Xu, Zhiyuan Li, Zhenlin Zhu +3
Previous X-ray observations toward the Nuclear Star Cluster (NSC) at the Galactic center have discovered thousands of point sources, most of which were believed to be cataclysmic v…
Exploring the Mass Segregation Effect of X-ray Sources in Globular Clusters: The Case of 47 Tucanae
Zhongqun Cheng, Zhiyuan Li, Xiangdong Li +2
Using archival {\it Chandra} observations with a total exposure of 510 ks, we present an updated catalog of point sources for Globular Cluster 47 Tucanae. Our study covers an area…
A Chandra Survey of Milky Way Globular Clusters II: Testing the Hills-Heggie Law
Zhongqun Cheng, Zhiyuan Li, Xiaojie Xu +3
Binary-single and binary-binary encounters play a pivotal role in the evolution of star clusters, as they may lead to the disruption or hardening of binaries, a novel prediction of…
A {\it Chandra} Survey of Milky Way Globular Clusters I: Emissivity and Abundance of Weak X-ray Sources
Zhongqun Cheng, Zhiyuan Li, Xiaojie Xu +1
Based on archival {\it Chandra} data, we have carried out an X-ray survey of 69, or nearly half the known population of, Milky Way globular clusters (GCs), focusing on weak X-ray s…
On the Spin Period Distribution in Be/X-ray Binaries
Z. -Q. Cheng, Y. Shao, X. -D. Li
There is a remarkable correlation between the spin periods of the accreting neutron stars in Be/X-ray binaries (BeXBs) and their orbital periods . Recently Knigge et al. (2011) sho…
Violation of a Bell inequality in two-dimensional spin-orbit hypoentangled subspaces
Lixiang Chen, Xiancong Lu, Zhongqun Cheng
Based on spin-orbit coupling induced by q-plates, we present a feasible experimental proposal for preparing two-dimensional spatially inhomogeneous polarizations of light. We furth…