Zobrazeno 1 - 10
of 72
pro vyhledávání: '"Shu, Fengchun"'
Autor:
Xu, Shuangjing, Jung, Taehyun, Zhang, Bo, Xu, Ming Hui, Byun, Do-Young, He, Xuan, Sakai, Nobuyuki, Titov, Oleg, Shu, Fengchun, Kim, Hyo-Ryoung, Cho, Jungho, Yoo, Sung-Moon, Choi, Byung-Kyu, Lee, Woo Kyoung, Sun, Yan, Mai, Xiaofeng, Wang, Guangli
Extending geodetic and astrometric Very Long Baseline Interferometry (VLBI) observations from traditional centimeter wavebands to millimeter wavebands offers numerous scientific potentials and benefits. However, it was considered quite challenging du
Externí odkaz:
http://arxiv.org/abs/2409.07309
Autor:
Zhang, Jingdong, Zhang, Bo, Xu, Shuangjing, Liu, Niu, Chen, Wen, Ding, Hao, Jiang, Pengfei, Sun, Yan, Wang, Jinqing, Cui, Lang, Wen, Shiming, Mai, Xiaofeng, Li, Jinling, Shu, Fengchun, Huang, Yidan
The Gaia celestial reference frame (Gaia-CRF) will benefit from a close assessment with independent methods, such as Very Long Baseline Interferometry (VLBI) measurements of radio stars at bright magnitudes. However, obtaining full astrometric parame
Externí odkaz:
http://arxiv.org/abs/2403.04141
Autor:
Jiang, Pengfei, Cui, Lang, Liu, Xiang, Zhang, Bo, Huang, Yongfeng, Cao, Hongmin, An, Tao, Yang, Jun, Shu, Fengchun, Tan, Guiping, Yuan, Jianping
LAMOST J024048.51+195226.9 (J0240+1952) was recently identified as the second AE Aquarii (AE Aqr)-type cataclysmic variable, possessing the fastest known rotating white dwarf. We performed a Very Long Baseline Interferometry (VLBI) observation of J02
Externí odkaz:
http://arxiv.org/abs/2312.00307
Autor:
Chen, Wen, Zhang, Bo, Zhang, Jingdong, Yang, Jun, Xu, Shuangjing, Sun, Yan, Mai, Xiaofeng, Shu, Fengchun, Wang, Min
To accurately link the radio and optical Celestial Reference Frames (CRFs) at optical bright end, i.e., with Gaia G band magnitude < 13, increasing number and improving sky distribution of radio stars with accurate astrometric parameters from both Ve
Externí odkaz:
http://arxiv.org/abs/2304.10886
Autor:
Titov, Oleg, Frey, Sandor, Melnikov, Alexei, Shu, Fengchun, Xia, Bo, Gonzalez, Javier, Tercero, Belen, Gurvits, Leonid, de Witt, Aletha, McCallum, Jamie, Kharinov, Mikhail, Zimovsky, Vladimir, Krezinger, Mate
Publikováno v:
The Astronomical Journal, Vol. 165, id. 69 (2023)
Radio-loud quasars at high redshift (z > 4) are rare objects in the Universe and rarely observed with Very Long Baseline Interferometry (VLBI). But some of them have flux density sufficiently high for monitoring of their apparent position. The instab
Externí odkaz:
http://arxiv.org/abs/2302.12957
Autor:
Jiang, Pengfei, Cui, Lang, Yang, Jun, Zhang, Bo, Xu, Shuangjing, Shu, Fengchun, Jiang, Wu, Chen, Wen, Li, Guanghui, Xia, Bo, Weston, Stuart, Gulyaev, Sergei, Cao, Hongmin, Liu, Xiang, An, Tao
AR Scorpii (AR Sco), the only-known radio-pulsing white dwarf binary, shows unusual pulsating emission at the radio, infrared, optical and ultraviolet bands. To determine its astrometric parameters at the radio band independently, we conducted multi-
Externí odkaz:
http://arxiv.org/abs/2301.13470
Autor:
Titov, Oleg, Frey, Sándor, Lambert, Sébastien, Shu, Fengchun, Xia, Bo, González, Javier, Tercero, Belén, Gulayev, Sergey, Weston, Stuart, Natusch, Tim
Astrometric positions of radio-emitting active galactic nuclei (AGNs) can be determined with sub-milliarcsec accuracy using very long baseline interferometry (VLBI). The usually small apparent proper motion of distant extragalactic targets allow us t
Externí odkaz:
http://arxiv.org/abs/2202.13119
Autor:
Zhang, Yingkang, An, Tao, Frey, Sándor, Yang, Xiaolong, Krezinger, Máté, Titov, Oleg, Melnikov, Alexey, de Vicente, Pablo, Shu, Fengchun, Wang, Ailing
Jets of high-redshift active galactic nuclei (AGNs) can be used to directly probe the activity of the black holes in the early Universe. Radio sources with jets misaligned with respect to the line of sight are expected to dominate the high-redshift A
Externí odkaz:
http://arxiv.org/abs/2108.02142
Autor:
Titov, Oleg, Lambert, Sebastien, Soja, Benedikt, Shu, Fengchun, Melnikov, Alexei, McCallum, Jamie, McCallum, Lucia, Schartner, Matthias, de Witt, Aletha, Ivanov, Dmitrii, Mikhailov, Andrei, Yi, Sang Oh, Chen, Wen, Xia, Bo, Ishigaki, Masafumi, Gulyaev, Sergei, Natusch, Tim, Weston, Stuart
Geodetic Very Long Baseline Interferometry (VLBI) data are capable of measuring the light deflection caused by the gravitational field of the Sun and large planets with high accuracy. The parameter $\gamma$ of the parametrized Post-Newtonian (PPN) fo
Externí odkaz:
http://arxiv.org/abs/1908.00973
Autor:
Titov, Oleg, Girdiuk, Anastasiia, Lambert, Sebastien, Lovell, Jim, McCallum, Jamie, Shabala, Stas, McCallum, Lucia, Mayer, David, Schartner, Matthias, de Witt, Aletta, Shu, Fengchun, Melnikov, Alexei, Ivanov, Dmitrii, Mikhailov, Andrei, Yi, Sangoh, Soja, Benedikt, Xia, Bo, Jiang, T
Publikováno v:
A&A 618, A8 (2018)
Context. We highlight the capabilities of the geodetic VLBI technique to test General relativity in the classical astrometric style, i.e., measuring the deflection of light in the vicinity of the Sun. Aims. In previous studies, the parameter was esti
Externí odkaz:
http://arxiv.org/abs/1806.11299