Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Feng, Hai-Cheng"'
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:
Cheng, Cheng, Xu, Cong Kevin, Appleton, P. N., Duc, P. -A., Tang, N. -Y., Dai, Y. S., Huang, J. -S., Lisenfeld, U., Renaud, F., He, Chuan, Feng, Hai-Cheng
We carried out deep mapping observations of the atomic hydrogen (HI) 21 cm line emission in a field centered on the famous galaxy group Stephan's Quintet (SQ), using the Five-hundred-meter Aperture Spherical Telescope (FAST) equipped with the 19-Beam
Externí odkaz:
http://arxiv.org/abs/2306.11231
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
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:
Lu, Kai-Xing, Wang, Jian-Guo, Zhang, Zhi-Xiang, Huang, Ying-Ke, Xu, Liang, Xin, Yu-Xin, Yu, Xiao-Guang, Ding, Xu, Wang, De-Qing, Feng, Hai-Cheng
We present the results from a spectroscopic monitoring campaign to obtain reverberation-mapping measurements and investigate the broad-line region kinematics for active galactic nuclei (AGN) of Mrk~817 and NGC~7469. This campaign was undertaken with
Externí odkaz:
http://arxiv.org/abs/2106.10589
Autor:
Lu, Kai-Xing, Zhang, Zhi-Xiang, Huang, Ying-Ke, Ren, An-Bing, Xu, Liang, Feng, Hai-Cheng, Xin, Yu-Xin, Ding, Xu, Yu, Xiao-Guang, Bai, Jin-Ming
Observing a telluric standard star for correcting the telluric absorption lines of spectrum will take a significant amount of precious telescope time, especially in the long-term spectral monitoring project. Beyond that, it's difficult to select a su
Externí odkaz:
http://arxiv.org/abs/2103.08136