Zobrazeno 1 - 10
of 3 649
pro vyhledávání: '"cai, zhen"'
Autor:
Chen, Shi-Jiang, Wang, Jun-Xian, Kang, Jia-Lai, Kang, Wen-Yong, Sou, Hao, Liu, Teng, Cai, Zhen-Yi, Su, Zhen-Bo
A core sample of 59 unobscured type 1 AGNs with simultaneous XMM-Newton X-ray and UV observations is compiled from archive to probe the nature of soft X-ray excess (SE). In the first paper of this series, our focus centers on scrutinizing the spectra
Externí odkaz:
http://arxiv.org/abs/2412.11178
Autor:
Cai, Zhen-Yi
Publikováno v:
2024, Universe, 10, 431
Leveraging the photometric data of the Sloan Digital Sky Survey and the Galaxy Evolution Explorer (GALEX), we construct mean/median spectral energy distributions (SEDs) for unique bright quasars in redshift bins of 0.2 and up to $z \simeq 3$, after t
Externí odkaz:
http://arxiv.org/abs/2411.13208
Autor:
Su, Zhen-Bo, Cai, Zhen-Yi, Wang, Jun-Xian, Wang, Tinggui, Xue, Yongquan, Cai, Min-Xuan, Fan, Lulu, Guo, Hengxiao, He, Zhicheng, He, Zizhao, Hu, Xu-Fan, Jiang, Ji-an, Jiang, Ning, Kang, Wen-Yong, Lei, Lei, Liu, Guilin, Liu, Teng, Liu, Zhengyan, Sheng, Zhenfeng, Sun, Mouyuan, Zhao, Wen
The inter-band lags among the optical broad-band continua of active galactic nuclei (AGNs) have been intensively explored over the past decade. However, the nature of the lags remains under debate. Here utilizing two distinct scenarios for AGN variab
Externí odkaz:
http://arxiv.org/abs/2410.10100
The elemental abundances of stars reflect the complex enrichment history of the galaxy. To explore and explain the metal enrichment history of the cosmic environment near our solar system, we study the evolution of $^{56} \mathrm{Fe}$ abundance over
Externí odkaz:
http://arxiv.org/abs/2409.02040
Autor:
Zhou, Shuying, Sun, Mouyuan, Feng, Hai-Cheng, Li, Sha-Sha, Xue, Yongquan, Wang, Jun-Xian, Cai, Zhen-Yi, Bai, Jin-Ming, Li, Danyang, Guo, Hengxiao, Liu, H. T., Lu, Kai-Xing, Mao, Jirong, Marculewicz, Marcin, Wang, Jian-Guo
Resolving the inner structures of active galactic nuclei (AGNs) provides the "standard ruler" to measure the parallax distances of the Universe and a powerful way to weigh supermassive black holes (SMBHs). Thanks to time-domain observations, it is po
Externí odkaz:
http://arxiv.org/abs/2408.11292
We present the timing analysis of 10 archived \XMM observations with an exposure of $>40$ ks of Markarian 421. Mrk 421 is the brightest high-frequency-peaked BL Lac object (HBL) emitting in X-rays produced by electrons accelerated in the innermost re
Externí odkaz:
http://arxiv.org/abs/2406.16291
Autor:
Kang, Wen-Yong, Wang, Jun-Xian, Cai, Zhen-Yi, Wang, Hao-Chen, Ren, Wen-Ke, Liao, Mai, Yuan, Feng, Zdziarski, Andrzej, Cao, Xinwu
Quasars are generally divided into jetted radio-loud and non-jetted radio-quiet ones, but why only 10% quasars are radio loud has been puzzling for decades. Other than jet-induced-phenomena, black hole mass, or Eddington ratio, prominent difference b
Externí odkaz:
http://arxiv.org/abs/2406.13169
Marking the Pace: A Blockchain-Enhanced Privacy-Traceable Strategy for Federated Recommender Systems
Federated recommender systems have been crucially enhanced through data sharing and continuous model updates, attributed to the pervasive connectivity and distributed computing capabilities of Internet of Things (IoT) devices. Given the sensitivity o
Externí odkaz:
http://arxiv.org/abs/2406.04702
Autor:
Zuo, Wenwen, Guo, Hengxiao, Sun, Jingbo, Yuan, Qi, Lira, Paulina, Gu, Minfeng, Edwards, Philip G., Gupta, Alok C., Kishore, Shubham, Stevens, Jamie, An, Tao, Cai, Zhen-Yi, Feng, Haicheng, Ho, Luis C., Ilić, Dragana, Kovačević, Andjelka B., Li, ShaSha, Mezcua, Mar, Popović, Luka Č., Sun, Mouyuan, Tripathi, Tushar, U., Vivian, Vince, Oliver, Wang, Jianguo, Wang, Junxian, Wang, Shu, Wu, Xuebing, Zheng, Zhenya
Publikováno v:
ApJ (2024) 974:288
To investigate the short-term variability and determine the size of the optical continuum emitting region of intermediate-mass black holes (IMBHs), we carried out high-cadence, multiband photometric monitoring of a Seyfert 1 galaxy J0249-0815 across
Externí odkaz:
http://arxiv.org/abs/2405.11750
Publikováno v:
2024, ApJ, 969, 78
Variability of active galactic nuclei (AGNs) has long been servicing as an essential avenue of exploring the accretion physics of black hole (BH). There are two commonly used methods for analyzing AGN variability. First, the AGN variability, characte
Externí odkaz:
http://arxiv.org/abs/2405.02584