47 citations · 224 across the 22 of their papers we have counts for
23 papers
Revealing the Physical Driver of the Baldwin Effect: Gas Density in the Broad-Line Region
Wen-Qiang Liang, Zhi-Fu Chen, Rui-Jing Lu +8
The Baldwin effect --- the inverse correlation between the equivalent width of emission lines and the continuum luminosity in active galactic nuclei (AGNs) --- has been known for n…
Synchrotron Circular Polarization in Gamma-Ray Burst Prompt Optical Emission: Relativistic Thermal Electron Contribution
Kangfa Cheng, Jirong Mao, Xiaohong Zhao +4
Synchrotron circular polarization of a non-thermal power-law electron distribution in gamma-ray bursts (GRBs) has been studied. However, some numerical simulations have shown that…
The infrared traced star formation rates of associated absorption lines quasars
Zhe-Geng Chen, Rui-Jing Lu, Zhi-Fu Chen +4
Some optically selected quasars exhibit Mg II assoicated absorption lines (AALs), and its origin remains unclear. In this paper, we compile a sample of 1769 quasars, with or withou…
The Detection Rate of Associated \mgii\ Absorption Lines in Quasars Depends on Their Radio Emission
Chen ZF, Luis C. Ho
In active galactic nuclei, jet-driven feedback plays a significant role in influencing the properties of gas within their host galaxy and the circumgalactic medium. By combining ob…
Narrow [O III] emission lines as a potential proxy for the evolutionary stage of quasars
Zhi-fu Chen, Zhe-Geng Chen, Xing-long Peng +1
Radio spectral shape of quasars can provide insight into the ages of quasars. We have compiled data for 1804 quasars with from the Sloan Digital Sky Survey (SDSS). Add…
Synchrotron polarization of a hybrid distribution of relativistic thermal and nonthermal electrons in GRB prompt emission
Kangfa Cheng, Jirong Mao, Xiaohong Zhao +4
Synchrotron polarization of relativistic nonthermal electrons in gamma-ray bursts (GRBs) has been widely studied. However, recent numerical simulations of relativistic shocks and m…
The Transition from Galaxy-wide Gas Inflow to Outflow in Quasar Host Galaxies
Zhicheng He, Zhifu Chen, Guilin Liu +8
Galactic-wide outflows driven by active galactic nuclei (AGNs) is a routinely invoked feedback mechanism in galaxy evolution models. Hitherto, the interplay among the interstellar…
The polarization-angle flip in GRB prompt emission
Kangfa Cheng, Xiaohong Zhao, Jirong Mao +1
Aims. We aim to provide an explanation for the PA rotation in GRBs and find the physical conditions that lead to the rotation by 90 degrees in the toroidal magnetic-field (MF) mode…
The Study of Circumgalactic Medium with Quasar Pairs
Zhi-Fu Chen, Huan-Chang Qin, Jin-Ting Cai +4
We have collected 10025 foreground-background quasar pairs with projected distances kpc from the large quasar catalog of the SDSS DR16Q. We investigate the properties of…
Evidence for the connection between star formation rate and evolutionary phases of quasars
Zhifu Chen, Zhicheng He, Luis C. Ho +5
Both theory and observations suggest that outflows driven by an active central supermassive black hole (SMBH) has a feedback effect on shaping the global properties of the host gal…
The detections of inflowing gas from narrow absorption lines at the parsec scale
Zhi-Fu Chen, Minfeng Gu, Zhicheng He +4
Inflows at the dusty torus and smaller scales is crucial to investigate the process of supermassive black hole accretion. However, only few cases of inflowing gas at small scales h…
The correlated variations of C IV narrow absorption lines and quasar continuum
Zhi-Fu Chen, Ting-Ting Pang, Bing He +1
We assemble 207 variable quasars from the Sloan Digital Sky Survey, all with at least 3 observations, to analyze C IV narrow absorption doublets, and obtain 328 C IV narrow absorpt…
The associated absorption features in quasar spectra of the Sload Digital Sky survey .I. \MgII\ absorption doublets
Chen Zhi-Fu, Huang Wei-Rong, Pang Ting-Ting +5
Using the SDSS spectra of quasars included in the DR7Q or DR12Q catalogs, we search for Mg II narrow absorption doublets in the spectra data around Mg II emission lines. We obtain…
Collective properties of quasar narrow associated absorption lines
Chen Zhi-Fu, Pan Da-Sheng
This paper statistically investigates the properties of C IV and Mg II narrow absorption lines (NALs) to look for velocity cuts that can well constrain quasar-associated NALs. The…
Narrow C IV absorption doublets on quasar spectra of the Baryon Oscillation Spectroscopic Survey
Chen Zhi-fu, Gu Qiu-sheng, Zhou Luwenjia +1
In this paper, we extend our works of Papers I and II, which are assigned to systematically survey \CIVab\ narrow absorption lines (NALs) with \zabs\zem\ on quasar spectra of…
Narrow absorption lines with two observations of Sloan Digital Sky Survey
Zhi-Fu Chen, Qiu-Sheng Gu, Yan-Mei Chen +1
We assemble 3524 quasars from Sloan Digital Sky Survey (SDSS) with repeated observations to search for variations of narrow C IV1548,1551 and Mg II2796,2803 absorption doublets in…
Catalog of narrow C IV absorption lines in BOSS (II): for quasars with zem > 2.4
Zhi-Fu Chen, Yi-Ping Qin, Ming Qin +2
As the second work in a series of papers aiming to detect absorption systems in the quasar spectra of the Baryon Oscillation Spectroscopic Survey, we continue the analysis of Paper…
Catalog of narrow absorption lines in BOSS (I): for quasars with
Zhi-Fu Chen, Yi-Ping Qin, Cai-Juan Pan +3
We have assembled absorption systems by visually identifying absorption doublets in the quasar spectra of the Baryon Oscillation Spectroscopic Survey (BOSS)…
Roles of the kinetic and dynamic mechanisms in the relation
Yi-Ping Qin, Zhi-Fu Chen
The relation is a well-known relation in gamma-ray bursts. Its implication remains unclear. We propose to investigate the underlying mechanisms of this relation by cons…
Statistical classification of gamma-ray bursts based on the Amati relation
Yi-Ping Qin, Zhi-Fu Chen
Gamma-ray bursts (GRBs) are believed to belong to two classes and they are conventionally divided according to their durations. This classification scheme is not satisfied due to t…
The disappearance of a narrow Mg II absorption system in quasar SDSS J165501.31+260517.4
Zhi-Fu Chen, Yi-Ping Qin, Min-Feng Gu
In this letter, we present for the first time, the discovery of the disappearance of a narrow Mg II absorption system from the spectra of quasar SDSS J165501.31…
Disappearance of a narrow Mg II absorption system with a measured velocity up to
Zhi-Fu Chen, Yi-Ping Qin
Quasar J152645.61+193006.7 () was observed by the Sloan Digital Sky Survey (SDSS) on 2006 May 31, and again on 2011 April 9. The time interval of the SDSS two obs…
Emergences of C IV narrow absorption troughs in the quasar SDSS J095254.10+021932.8
Zhi-Fu Chen, Mu-Sheng Li, Wei-Rong Huang +2
In this paper, we report on two C IV narrow absorption systems emerging from the spectrum of the quasar SDSS J095254.10 +021932.8, which are located at and $z_…