Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Zunli Yuan"'
Autor:
Weimin Yi, P. B. Hall, Zunli Yuan, W. N. Brandt, D. P. Schneider, Zhicheng He, Jin-Ming Bai, Xue-Bing Wu
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 271, Iss 2, p 61 (2024)
We present an observational study of wind acceleration based on four low-ionization broad absorption line (BAL) quasars (J0136, J1238, J1259, and J1344). J0136 and J1344 (group 1) are radio-quiet and show large BAL-velocity shifts as opposed to stabl
Externí odkaz:
https://doaj.org/article/c8ec677cb0184ede941daca03461909b
Autor:
Fen Song, Zunli Yuan, Yan Li, Xuchao Wu, Adriano Pietrinferni, Helen Poon, Tao Wu, Jundan Nie, Hanfeng Song, Cheng Han, Ye Yang, Yuxuan Li, Xingming Bai
Publikováno v:
Astrophysics and Space Science. 367
In this paper, we obtain two improved Amati correlations of the Gamma-Ray burst (GRB) data via a powerful statistical tool called copula. After calibrating, with the low-redshift GRB data, the improved Amati correlations based on a fiducial $\Lambda$
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1286842b1ffd95ce4390251d410138c
We construct a three-dimensional and redshift-evolutionary X-ray and ultraviolet ($L_X-L_{UV}$) luminosity relation for quasars from the powerful statistic tool called copula, and find that the constructed $L_X-L_{UV}$ relation from copula is more vi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::997aa7d03453fda473bb6dd5e2cc157b
Publikováno v:
The Astrophysical Journal. 935:7
An improved Amati correlation was constructed in (ApJ 931 (2022) 50) by us recently. In this paper, we further study constraints on the $\Lambda$CDM and $w$CDM models from the gamma ray bursts (GRBs) standardized with the standard and improved Amati
Publikováno v:
The Astrophysical Journal Supplement Series. 260:10
We propose a generalization of our previous KDE (kernel density estimation) method for estimating luminosity functions (LFs). This new upgrade further extend the application scope of our KDE method, making it a very flexible approach which is suitabl
Publikováno v:
The Astrophysical Journal Supplement Series. 248:1
We propose a flexible method for estimating luminosity functions (LFs) based on kernel density estimation (KDE), the most popular nonparametric density estimation approach developed in modern statistics, to overcome issues surrounding binning of LFs.
Using the Markov chain Monte Carlo method to study the physical properties of GeV–TeV BL Lac objects
Publikováno v:
Publications of the Astronomical Society of Japan. 70
We fit the spectral energy distributions (SEDs) of 46 GeV - TeV BL Lac objects in the frame of leptonic one-zone synchrotron self-Compton (SSC) model and investigate the physical properties of these objects. We use the Markov Chain Monte Carlo (MCMC)
Publikováno v:
Yuan, Z, Wang, J, Worrall, D M, Zhang, B-B & Mao, J 2018, ' Determining the Core Radio Luminosity Function of Radio AGNs via Copula ', Astrophysical Journal Supplement Series, vol. 239, no. 2, 33 . https://doi.org/10.3847/1538-4365/aaed3b
The radio luminosity functions (RLFs) of active galactic nuclei (AGNs) are traditionally measured based on total emission, which doesn't reflect the current activity of the central black hole. The increasing interest in compact radio cores of AGNs re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c075c0771a07615a92cf42a26b5d7cbc
Following previous work, we further confirm that the cosmic evolution of steep-spectrum radio-loud AGNs (active galactic nuclei) can be reproduced by a simple combination of density evolution (DE) and luminosity evolution (LE). This mixture evolution
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8b717d8e086d672b01357bbe17f7421
http://arxiv.org/abs/1708.03087
http://arxiv.org/abs/1708.03087