Zobrazeno 1 - 10
of 82
pro vyhledávání: '"Jiang-He Yang"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 7, Pp 1-11 (2024)
Abstract In this paper, we extend Chandrasekhar’s method of calculating rotating black holes into f(R) theory. We show that the solution with constant Ricci scalar always exists in a general f(R) gravity and derive the Kerr and Kerr-Ads metric by u
Externí odkaz:
https://doaj.org/article/3836485377a74cc0b10f43323be4ee47
Autor:
Jun-Hui Fan, Ke-Yin Chen, Hu-Bing Xiao, Wen-Xin Yang, Jing-Chao Liang, Guo-Hai Chen, Jiang-He Yang, Yu-Hai Yuan, De-Xiang Wu
Publikováno v:
Universe, Vol 8, Iss 8, p 436 (2022)
In this work, the support vector machine (SVM) method is adopted to separate BL Lacertae objects (BL Lacs) and flat spectrum radio quasars (FSRQs) in the plots of the photon spectrum index against the photon flux, αph∼logF, those of the photon spe
Externí odkaz:
https://doaj.org/article/8dc7abb1b7f646558957e62c007d213d
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 33, Iss 2, Pp 105-108 (2016)
In this work, based on our previous calculations of spectral energy distributions for a sample of Fermi blazars (Fan et al. 2015a), we calculated the radio loudness and performed correlation analyses. Our analysis results show that radio loudness i
Externí odkaz:
https://doaj.org/article/46091538fa644004b76a1b4f097753ae
Publikováno v:
Astrophysics and Space Science. 367
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b221af38bceea68fa94cac21c1caac75
https://doi.org/10.1007/s10509-022-04124-8
https://doi.org/10.1007/s10509-022-04124-8
Autor:
Wen-Xin Yang, Hu-Bing Xiao, Hong-Guang Wang, Jiang-He Yang, Zhi-Yuan Pei, De-Xiang Wu, Yu-Hai Yuan, Jun-Hui Fan
Publikováno v:
Research in Astronomy and Astrophysics. 22:085002
In this work, the γ-ray photon flux, photon spectral index (α ph), variability index ( log V . I . ), and the synchrotron peak frequency ( log ν p ) are compiled for 851 common blazars from the 3FGL and 4FGL catalogs and Fan et al. to investigate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b725b0880e6298d52b8731fb1ac8b1d6
https://doi.org/10.1088/1674-4527/ac712c
https://doi.org/10.1088/1674-4527/ac712c
A two-component model of radio emission has been used to explain some radio observational properties of Active Galactic Nuclei (AGNs) and, in particular, of blazars. In this work, we extend the two-component idea to the $\gamma$-ray emission and assu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e55afed528201bddc36c8e33b3a8b950
http://arxiv.org/abs/2009.06624
http://arxiv.org/abs/2009.06624
Publikováno v:
Science China Physics, Mechanics & Astronomy. 63
We present a sample of 4388 AGNs with available radio core-dominance parameters—defined as the ratio of the core flux densities to the extended ones, R = Score/Sext.—which includes 630 Fermi-detected AGNs from the fourth source catalog (4FGL) of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e45781c03c176a86df6062d7ef288017
https://doi.org/10.1007/s11433-019-1454-6
https://doi.org/10.1007/s11433-019-1454-6
Autor:
Jun-Hui Fan, Denise Costantin, Zhiyuan Pei, Jiang-He Yang, Yu-Tao Zhang, Yi Liu, Yu-Hai Yuan, Jun Tao, Hu-Bing Xiao, Wenxin Yang, L. X. Zhang
Publikováno v:
Science China Physics, Mechanics & Astronomy. 62
Active galactic nuclei (AGNs) have been attracting research attention due to their special observable properties. Specifically, a majority of AGNs are detected by Fermi-LAT missions, but not by Fermi-LAT, which raises the question of weather any diff
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4cf0794484f946068079652d5ef3fbc7
https://doi.org/10.1007/s11433-018-9371-x
https://doi.org/10.1007/s11433-018-9371-x
Active galactic nuclei (AGNs) can be divided into two major classes, namely radio-loud and radio-quiet AGNs. A small subset of the radio-loud AGNs is called blazars, which are believed to be unified with Fanaroff-Riley type I and type II (FRI&II) rad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8af8f8fa57cb684cb0257eb23df90edd
Autor:
J. T. Zhu, S. L. He, Minfeng Gu, J. T. Cai, W. X. Yang, Jiang-He Yang, Y. H. Yuan, Yi Liu, M. G. Nikolashvili, G. Y. Luo, Xiang Liu, O. M. Kurtanidze, S. O. Kurtanidze, Jun-Hui Fan, L. X. Zhang
Publikováno v:
The Astrophysical Journal Supplement Series. 253:10
In this work, we present 8523 pairs of R-band optical photometry observations for the quasar 3C 454.3 made during the period of 2006 October–2018 February on the 70 cm meniscus telescope at Abastumani Observatory, Georgia, to study its intraday var
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc5ac197e1fb28336a7de2a362077ce9
https://doi.org/10.3847/1538-4365/abd32d
https://doi.org/10.3847/1538-4365/abd32d