Zobrazeno 1 - 10
of 458
pro vyhledávání: '"Li, Sha-Sha"'
Autor:
Li, Sha-Sha, Feng, Hai-Cheng, Liu, H. T., Bai, J. M., Ji, Xiang, Cheng, Cheng, Lu, Kai-Xing, Wang, Jian-Guo, Li, Rui
Broad emission lines of active galactic nuclei (AGNs) originate from the broad-line region (BLR), consisting of dense gas clouds in orbit around an accreting supermassive black hole. Understanding the geometry and kinematics of the region is crucial
Externí odkaz:
http://arxiv.org/abs/2407.05414
Autor:
Feng, Hai-Cheng, Li, Rui, Napolitano, Nicola R., Li, Sha-Sha, Bai, J. M., Li, Ran, Liu, H. T., Lu, Kai-Xing, Radovich, Mario, Shan, Huan-Yuan, Wang, Jian-Guo, Xi, Wen-Zhe, Xie, Ling-Hua, Zhang, Yang-Wei
We present a novel multimodal neural network for classifying astronomical sources in multiband ground-based observations, from optical to near infrared, to separate sources in stars, galaxies and quasars. Our approach combines a convolutional neural
Externí odkaz:
http://arxiv.org/abs/2406.03797
Autor:
Xi, Wen-Zhe, Lu, Kai-Xing, Feng, Hai-Cheng, Li, Sha-Sha, Bai, Jin-Ming, Zhou, Rui-Lei, Liu, Hong-Tao, Wang, Jian-Guo
Publikováno v:
Res.Astron.Astrophys.23(2023)125021
Long-term spectroscopic monitoring campaigns on active galactic nuclei (AGNs) provide a wealth of information about its interior structure and kinematics. However, a number of the observations suffer from the contamination of second-order spectra (SO
Externí odkaz:
http://arxiv.org/abs/2401.11970
Publikováno v:
2024, ApJ, 963, 30
Under the hypothesis of gravitational redshift induced by the central supermassive black hole, and based on line widths and shifts of redward shifted H$\beta$ and H$\alpha$ broad emission lines for more than 8000 SDSS DR7 AGNs, we measure the virial
Externí odkaz:
http://arxiv.org/abs/2401.02612
Autor:
Khatu, Viraja C., Gallagher, Sarah C., Horne, Keith, Cackett, Edward M., Hu, Chen, Du, Pu, Wang, Jian-Min, Bian, Wei-Hao, Bai, Jin-Ming, Chen, Yong-Jie, Hall, Patrick, Jiang, Bo-Wei, Li, Sha-Sha, Li, Yan-Rong, Pasquini, Sofia, Songsheng, Yu-Yang, Wang, Chan, Xiao, Ming, Yu, Zhe
Measuring broad emission-line widths in active galactic nuclei (AGN) is not straightforward owing to the complex nature of flux variability in these systems. Line-width measurements become especially challenging when signal-to-noise is low, profiles
Externí odkaz:
http://arxiv.org/abs/2303.15618
Autor:
Lu, Kai-Xing, Bai, Jin-Ming, Wang, Jian-Min, Hu, Chen, Li, Yan-Rong, Du, Pu, Xiao, Ming, Feng, Hai-Cheng, Li, Sha-Sha, Wang, Jian-Guo, Zhang, Zhi-Xiang, Huang, Ying-Ke
NGC 5548 is one of the active galactic nuclei (AGN) selected for our long-term spectroscopic monitoring with the Lijiang 2.4~m telescope, aiming at investigating the origin and evolution of the broad-line regions (BLRs), accurately measuring the mass
Externí odkaz:
http://arxiv.org/abs/2209.10853
Autor:
Li, Sha-Sha, Feng, Hai-Cheng, Liu, H. T., Bai, J. M., Li, Rui, Lu, Kai-Xing, Wang, Jian-Guo, Huang, Ying-Ke, Zhang, Zhi-Xiang
Changing-look active galactic nucleus NGC~4151, which has attracted a lot of attention, is undergoing the second dramatic outburst stage in its evolutionary history. To investigate the geometry and kinematics of the broad-line region (BLR), and measu
Externí odkaz:
http://arxiv.org/abs/2208.02966
Autor:
Bao, Dong-Wei, Brotherton, Michael S., Du, Pu, McLane, Jacob N., Zastrocky, T. E., Olson, Kianna A., Fang, Feng-Na, Zhai, Shuo, Huang, Zheng-Peng, Wang, Kai, Zhao, Bi-Xuan, Li, Sha-Sha, Yang, Sen, Chen, Yong-Jie, Liu, Jun-Rong, Yao, Zhu-Heng, Peng, Yue-Chang, Guo, Wei-Jian, Songsheng, Yu-Yang, Li, Yan-Rong, Jiang, Bo-Wei, Kasper, David H., Chick, William T., Nguyen, My L., Maithil, Jaya, Kobulnicky, H. A., Dale, D. A., Hand, Derek, Adelman, C., Carter, Z., Murphree, A. M., Oeur, M., Schonsberg, S., Roth, T., Winkler, Hartmut, Marziani, Paola, D'Onofrio, Mauro, Hu, Chen, Xiao, Ming, Xue, Suijian, Czerny, Bożena, Aceituno, Jesús, Ho, Luis C., Bai, Jin-Ming, Wang, Jian-Min
In this third paper of the series reporting on the reverberation mapping (RM) campaign of active galactic nuclei with asymmetric H$\beta$ emission-line profiles, we present results for 15 Palomar-Green (PG) quasars using spectra obtained between the
Externí odkaz:
http://arxiv.org/abs/2207.00297
Publikováno v:
2022, ApJ, 928, 60
Under the hypothesis of gravitational redshift induced by the central supermassive black hole, and based on line widths and shifts of redward shifted H$\beta$ and Fe ii broad emission lines for a sample of 1973 $z<0.8$ SDSS DR5 quasars, we measured t
Externí odkaz:
http://arxiv.org/abs/2202.08949
Autor:
Huang, Ying-Ke, Fang, Yue-Dong, Lu, Kai-Xing, Zhang, Zhi-Xiang, Liu, Ji-Lin, Li, Sha-sha, Luo, Bao-Rui, Lin, Qin, Huo, Zhuo-Xi
Measuring the quasar distance through joint analysis of spectroastrometry (SA) and reverberation mapping (RM) observations is a new method for driving the development of cosmology. In this paper, we carry out detailed simulation and analysis to study
Externí odkaz:
http://arxiv.org/abs/2112.14069