Zobrazeno 1 - 10
of 106
pro vyhledávání: '"Zhi-Fu Chen"'
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 277 (2024)
Radio spectral shape of quasars can provide insight into the ages of quasars. We have compiled data for 1804 quasars with z ≲ 1 from the Sloan Digital Sky Survey (SDSS). Additionally, these quasars were also mapped by the Low-Frequency Array at 144
Externí odkaz:
https://doaj.org/article/6b21445620b447dbb1e51f4e89f1a031
Publikováno v:
The Astrophysical Journal, Vol 963, Iss 1, p 3 (2024)
It is commonly accepted that outflows from the central regions of quasars play a substantial role in regulating the global properties of the host galaxy. These outflows are typically detected through blueshifted absorption lines. However, the questio
Externí odkaz:
https://doaj.org/article/46632e9aa928497b80d9a76cfb3effeb
Autor:
Zhi-Fu, Chen, Wei-Rong, Huang, Ting-Ting, Pang, Hong-Yan, Huang, Da-Sheng, Pan, Min, Yao, Wei-Jing, Nong, Mei-Mei, Lu
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 17,316 Mg II doublets, within the redshift range of 0.3299<= z_abs <=
Externí odkaz:
http://arxiv.org/abs/1801.07998
Publikováno v:
2018,ApJS,234,16
Using the quasars with z_em < 0.9 from the Baryon Oscillation Spectroscopic Survey, we measure the spectral characteristics, including continuum and emission lines, around the Hbeta and Halpha spectral regions, which are lacking in Quasar Data Releas
Externí odkaz:
http://arxiv.org/abs/1801.07907
Autor:
Zhi-Fu, Chen, Da-Sheng, Pan
Publikováno v:
2017,ApJ,848,79
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 coverage fraction (f_c) is defined as the ratio between the number of
Externí odkaz:
http://arxiv.org/abs/1801.07429
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$\ll$\zem\ on quasar spectra of the Baryon Oscillation Spectroscopic Survey (BOSS), to collect \CIV\ N
Externí odkaz:
http://arxiv.org/abs/1608.07095
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 264, Iss 2, p 52 (2023)
This paper provides the compilations of properties of the quasars newly obtained by the Sloan Digital Sky Survey (SDSS) during the fourth stage (SDSS-IV). The catalog is available on the journal's website. We have measured the main properties of emis
Externí odkaz:
https://doaj.org/article/62c05a1cf64d4e4098058ec73b8b3c38
Autor:
Zhi-Fu Chen, Huan-Chang Qin, Jin-Ting Cai, Yu-Tao Zhou, Zhe-Geng Chen, Ting-Ting Pang, Zhi-Wen Wang, Kang-Fa Cheng
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 265, Iss 2, p 46 (2023)
We have collected 10,025 foreground–background quasar pairs with projected distances d _p < 500 kpc from the large quasar catalog of the Sloan Digital Sky Survey DR16Q. We investigate the properties of the Mg ii absorption lines with W _r > 0.15 Å
Externí odkaz:
https://doaj.org/article/ccda1f36f4d349ecb9181be364281fc0
Autor:
Jin-Tao Zou, Hai-Ming Jing, Yue Yuan, Lang-Huan Lei, Zhi-Fu Chen, Qiang Gou, Qing-Shan Xiong, Xiao-Li Zhang, Zhuo Zhao, Xiao-Kai Zhang, Hao Zeng, Quan-Ming Zou, Jin-Yong Zhang
Publikováno v:
PLoS Pathogens, Vol 17, Iss 7, p e1009752 (2021)
Highly immunogenic exotoxins are used as carrier proteins because they efficiently improve the immunogenicity of polysaccharides. However, their efficiency with protein antigens remains unclear. In the current study, the candidate antigen PA0833 from
Externí odkaz:
https://doaj.org/article/ed48bfb67a2d44089ceaab1838503c02
Autor:
Zhi-Fu Chen, Huan-Chang Qin, Jin-Ting Cai, Yu-Tao Zhou, Zhe-Geng Chen, Ting-Ting Pang, Zhi-Wen Wang, Kang-Fa Cheng
We have collected 10025 foreground-background quasar pairs with projected distances $d_p0.15$ Å around foreground quasars, including both the LOS (line-of-sights of foreground quasars) and transverse (TRA, perpendicular to the LOS) absorptions. Both
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b46de784615183936338b5266f348a2