Zobrazeno 1 - 10
of 41 604
pro vyhledávání: '"AGNs"'
The geometry and kinematics of the broad-line region (BLR) in AGNs are still unclear, which is crucial for studying the physics and evolution of supermassive black holes (SMBHs) and AGNs. The broad-line profile provides valuable information on BLR ge
Externí odkaz:
http://arxiv.org/abs/2412.18146
Autor:
Zhu, Li-tao, Wang, Zhongxiang, Devanand, P. U., Gupta, Alok C., Dogra, Karan, Li, Jie, Zhang, Ju-Jia, Ji, Shun-hao, Sun, Si-si
We develop a simple method to search for changing-look (CL) active galactic nucleus (AGN) candidates, and conduct a test run. In this method, optical variations of AGNs are monitored and CL-AGNs may appear to have a pattern of being bluer when in bri
Externí odkaz:
http://arxiv.org/abs/2412.12420
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:
Uematsu, Ryosuke, Ueda, Yoshihiro, Alexander, David M., Swinbank, A. M., Smail, Ian, Andonie, Carolina, Chen, Chian-Chou, Dudzeviciute, Ugne, Ikarashi, Soh, Kohno, Kotaro, Matsuda, Yuichi, Puglisi, Annagrazia, Umehata, Hideki, Wang, Wei-Hao
We investigate the properties of active galactic nuclei (AGNs) in the brightest submillimeter galaxies (SMGs) in the COSMOS field. We utilize the bright sample of ALMA/SCUBA-2 COSMOS Survey (AS2COSMOS), which consists of 260 SMGs with $S_{\mathrm{870
Externí odkaz:
http://arxiv.org/abs/2412.09737
The James Webb Space Telescope (JWST) observations enable the exploration of active galactic nuclei (AGNs) with broad-line emission in the early universe. Despite their clear radiative and morphological signatures of AGNs in rest-frame optical bands,
Externí odkaz:
http://arxiv.org/abs/2412.03653
We present a systematic search for radio active galactic nuclei (AGNs) in dwarf galaxies using recent observations taken by the Very Large Array Sky Survey (VLASS). To select these objects, we first establish a criterion to identify radio-excess AGNs
Externí odkaz:
http://arxiv.org/abs/2411.14535
Understanding the UV/Optical Variability of AGNs through Quasi-Periodic Large-scale Magnetic Dynamos
Autor:
Zhou, Hongzhe, Lai, Dong
The UV/optical light curves observed in active galactic nuclei (AGNs) are well-characterized by damped random walk (DRW) process, with the damping time $\tau_d$ exhibiting correlations with both the black hole mass ($M_{BH}$) and the photon wavelengt
Externí odkaz:
http://arxiv.org/abs/2411.12953
We used random forest algorithms to classify all objects in a large portion of the sky, using optical light curves obtained, or built from images provided, by the Zwicky Transient Facility (ZTF). We compare different selection sets based on alerts or
Externí odkaz:
http://arxiv.org/abs/2412.14298
Autor:
Fahey, Matthew J., Garland, Izzy. L., Simmons, Brooke. D., Keel, William C., Shanahan, Jesse, Coil, Alison, Glikman, Eilat, Lintott, Chris J., Masters, Karen L., Moran, Ed, Smethurst, Rebecca J., Géron, Tobias, Thorne, Matthew R.
Active galactic nucleus (AGN) growth in disk-dominated, merger-free galaxies is poorly understood, largely due to the difficulty in disentangling the AGN emission from that of the host galaxy. By carefully separating this emission, we examine the dif
Externí odkaz:
http://arxiv.org/abs/2410.22404
Autor:
Wang, Shu, Woo, Jong-Hak, Gallo, Elena, Son, Donghoon, Yang, Qian, Jin, Junjie, Guo, Hengxiao, Kong, Minzhi
We report the discovery of eight new recurrent changing-look (CL) active galactic nuclei (AGNs), including seven re-brightening turn-off AGNs and one fading turn-on AGN. These systems are valuable for placing constraints on the duration of dim and br
Externí odkaz:
http://arxiv.org/abs/2410.15587