Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Chen, Zhi‐Fu"'
Autor:
Chen, Zhi-Fu, Qin, Huan-Chang, Cai, Jin-Ting, Zhou, Yu-Tao, Chen, Zhe-Geng, Pang, Ting-Ting, Wang, Zhi-Wen
We have collected 10025 foreground-background quasar pairs with projected distances $d_p<500$ kpc from the large quasar catalog of the SDSS DR16Q. We investigate the properties of the Mg II absorption lines with $W_r>0.15$ \AA\ around foreground quas
Externí odkaz:
http://arxiv.org/abs/2302.12492
Publikováno v:
A&A 659, A103 (2022)
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 have been reported through redshifted broad absorption lines so far. He
Externí odkaz:
http://arxiv.org/abs/2112.07189
Publikováno v:
Published by ApJS, 2018, ApJS, 236, 39
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 absorption line systems. We find that 19 out of 328 C IV narrow absorption li
Externí odkaz:
http://arxiv.org/abs/1806.02016
Akademický článek
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Publikováno v:
2015,MNRAS,450,3904-3919
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 spectral regions shortward of 7000 Ang at the observed frame, which co
Externí odkaz:
http://arxiv.org/abs/1509.05899
Publikováno v:
2014, ApJS, 215, 12
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 I by expanding the quasar sample to those quasars with zem>2.4. This
Externí odkaz:
http://arxiv.org/abs/1412.3943
Publikováno v:
2014,ApJS,210,7
We have assembled absorption systems by visually identifying $C~IV\lambda\lambda1548,1551$ absorption doublets in the quasar spectra of the Baryon Oscillation Spectroscopic Survey (BOSS) one by one. This paper is the first of the series work. In this
Externí odkaz:
http://arxiv.org/abs/1312.5413
Autor:
Qin, Yi-Ping, Chen, Zhi-Fu
Publikováno v:
2013,ApJ,767,2
The $L_p - E_p$ 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 considering the corresponding kinetic and dynamic mechanisms separately. I
Externí odkaz:
http://arxiv.org/abs/1312.5110
In this letter, we present for the first time, the discovery of the disappearance of a narrow Mg II $\lambda\lambda2796,2803$ absorption system from the spectra of quasar SDSS J165501.31+260517.4 ($z_{\rm e}=1.8671$). This absorber is located at $z_{
Externí odkaz:
http://arxiv.org/abs/1311.4710
Autor:
Qin, Yi-Ping, Chen, Zhi-Fu
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 the fact that duration distributions of the two classes are heavily ove
Externí odkaz:
http://arxiv.org/abs/1311.4713