Zobrazeno 1 - 10
of 2 589
pro vyhledávání: '"Wu, JianFeng"'
Autor:
Wang, Shouzhi, Wu, Zhongzu, Zhang, Bo, Sotnikova, Yu., Mufakharov, T., Shen, Zhiqiang, Chen, Yongjun, Wu, Jianfeng
We present the results of our observations using the Giant Meterwave Radio Telescope (GMRT) to investigate the radio continuum and OH line emission of 10 OHM candidates from the Arecibo Legacy Fast ALFA (ALFALFA) survey. Among these candidates, we ha
Externí odkaz:
http://arxiv.org/abs/2403.03815
Autor:
Zuo, Zihao, Zhu, Shifu, Brandt, W. N., Garmire, Gordon P., Vito, F., Wu, Jianfeng, Xue, Yongquan
Highly radio-loud quasars (HRLQs; $\log R>2.5$) at $z\gtrsim 4$ show apparent enhanced X-ray emission compared to matched HRLQs at lower redshifts, perhaps due to a redshift-dependent fractional contribution to the X-ray luminosity from inverse-Compt
Externí odkaz:
http://arxiv.org/abs/2402.17828
Autor:
Wu, Jiancheng, Wu, Qingwen, Jin, Chichuan, Wu, Jianfeng, Lei, Weihua, Cao, Xinwu, Fan, Xiao, Lei, Xiangli, Wang, Mengye, Xue, Hanrui, Lyu, Bing
Weak-line quasars (WLQs) are a notable group of active galactic nuclei (AGNs) that show unusually weak UV lines even though their optical-UV continuum shapes are similar to those of typical quasars. The physical mechanism for WLQs is an unsolved puzz
Externí odkaz:
http://arxiv.org/abs/2402.10414
Autor:
Liu, Junhui, Wu, Jianfeng
X-ray emission is an important tracer of stellar magnetic activity. We carried out a systematic correlation analysis for the X-ray luminosity $\log L_{\rm X}$, bolometric luminosity $\log L_{\rm bol}$, and X-ray activity level $\log(L_{\textrm{X}}$/$
Externí odkaz:
http://arxiv.org/abs/2402.00640
We use LCOGT observations (MJD $59434-59600$) with a total exposure time of $\simeq 50$ hours and a median cadence of $0.5$ days to measure the inter-band time delays (with respect to $u$) in the $g$, $r$, and $i$ continua of a highly variable AGN, 6
Externí odkaz:
http://arxiv.org/abs/2401.12524
Autonomous vehicles are exposed to various weather during operation, which is likely to trigger the performance limitations of the perception system, leading to the safety of the intended functionality (SOTIF) problems. To efficiently generate data f
Externí odkaz:
http://arxiv.org/abs/2309.02964
The widely adopted ``lamppost'' thermal reprocessing model, in which the variable UV/optical emission is a result of the accretion disk reprocessing of the highly fluctuating X-ray emission, can be tested by measuring inter-band time lags in quasars
Externí odkaz:
http://arxiv.org/abs/2308.11310
We report the discovery of three HI absorbers toward low-power radio active galactic nuclei (AGNs) in a pilot HI absorption survey with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Compared to past studies, FAST observations have
Externí odkaz:
http://arxiv.org/abs/2306.01050
Autor:
Zhang, Shiwu, Cai, Zheng, Xu, Dandan, Shimakawa, Rhythm, Battaia, Fabrizio Arrigoni, Prochaska, Jason Xavier, Cen, Renyue, Zheng, Zheng, Wu, Yunjing, Li, Qiong, Dou, Liming, Wu, Jianfeng, Zabludoff, Ann, Fan, Xiaohui, Ai, Yanli, Golden-Marx, Emmet Gabriel, Li, Miao, Lu, Youjun, Ma, Xiangcheng, Wang, Sen, Wang, Ran, Yuan, Feng
Stars form in galaxies, from gas that has been accreted from the intergalactic medium. Simulations have shown that recycling of gas-the reaccretion of gas that was previously ejected from a galaxy-could sustain star formation in the early Universe. W
Externí odkaz:
http://arxiv.org/abs/2305.02344
Autor:
Ha, Trung, Dix, Cooper, Matthews, Brandon M., Shemmer, Ohad, Brotherton, Michael S., Myers, Adam, Richards, Gordon T., Maithil, Jaya, Anderson, Scott F., Brandt, W. N., Diamond-Stanic, Aleksandar M., Fan, Xiaohui, Gallagher, Sarah C., Green, Richard F., Lira, Paulina, Luo, Bin, Netzer, Hagai, Plotkin, Richard, Runnoe, Jessie C., Schneider, Donald P., Strauss, Michael A., Trakhtenbrot, Benny, Wu, Jianfeng
Weak emission-line quasars (WLQs) are a subset of Type 1 quasars that exhibit extremely weak Ly$\alpha +$N V $\lambda$1240 and/or C IV $\lambda$1549 emission lines. We investigate the relationship between emission-line properties and accretion rate f
Externí odkaz:
http://arxiv.org/abs/2304.04783