A5049488458- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Magnetic confinement fusion research
- Astronomy and Astrophysical Research
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
National Astronomical Observatories
1999-2025
Chinese Academy of Sciences
1999-2025
University of Chinese Academy of Sciences
2024-2025
Yunnan Observatories
1998-2001
Seven BL Lac objects have been photometrically observed in an effort to study the difference of optical intraday variability between radio-selected (RBLs) and X-ray-selected (XBLs). The we are selected arbitrarily. They four RBLs, PKS 0735+178, 0754+101, OJ 287 Lac, three XBLs, H 0323+022, 0548-322 2154-304. During observation all them exhibited microvariation, 0323+022 sometimes showed brightness oscillation. 0735+178 were their faint states not very active. It seems that RBLs do show...
We present the optical (B, V, and R) photometry for nine GeV and/or TeV γ-ray blazars, which were observed from 2000 through 2001 with 1 m telescope at Yunnan Astronomical Observatory. The γ-ray–loud source PKS 1510-089 was very active during our observation period, showing an apparent variation of 2.0 mag within 41 minutes in R band. This is most violently rapid variability monitoring program since 1982. Some physics parameters are calculated this source, namely, emission size, Doppler...
The results of optical photometric monitoring three BL Lac objects over a time interval about four years are presented. sources classical radio-selected objects, Lac, OJ 287 and PKS 0735+178. During our observation was in the stage large periodic outburst which consisted at least two peaks. Almost all observations obtained consecutive nights detected intranight variations. In 1995 1996 kept faint states, with fewer smaller rapid flares fluctuations. On contrary, late 1997 outburst,...
ABSTRACT The analysis of the cosmic microwave background data acquired by Atacama Cosmology Telescope and large-scale ($\ell \lesssim 1300$) Planck show a preference for early dark energy (EDE) theory, which was set to alleviate Hubble tension $\Lambda$ cold matter ($\Lambda$CDM) model decreasing sound horizon $r_{s}$, gives $H_{0} \approx 72$ km s$^{-1}$ Mpc$^{-1}$. However, EDE is commonly questioned exacerbating $\sigma _8$ on top $\Lambda$CDM model, its lack from late-time power spectrum...