SVOM(Space-based multiband Variable Object Monitor)is a Chinese-French space mission mainly designed to study Gamma-Ray Bursts.The satellite carries four instruments to detect and localize the prompt GRB emission and ...SVOM(Space-based multiband Variable Object Monitor)is a Chinese-French space mission mainly designed to study Gamma-Ray Bursts.The satellite carries four instruments to detect and localize the prompt GRB emission and measure the evolution of the afterglow in the visible band and in soft X-rays,and a VHF communication system enables the fast transmission of SVOM alerts to the ground.The ground segment includes an array of wide-angle cameras and two follow-up telescopes.It was launched into an orbit of about 635 km on 22 June 2024,with three years of nominal operations and an extension of two years.展开更多
SVOM is a mission dedicated for studying γ-Ray Bursts, and will also be a powerful target-ofopportunity observatory for the whole astronomy community. The mission has been approved jointly by both Chinese and French ...SVOM is a mission dedicated for studying γ-Ray Bursts, and will also be a powerful target-ofopportunity observatory for the whole astronomy community. The mission has been approved jointly by both Chinese and French space agencies. It is planned to be in the orbit in 2021 with an altitude ≤600 km and an inclination ≤30°.展开更多
SVOM(Space-based multiband astronomical Variable Objects Monitor)is a Chinese-French space mission dedicated to studying Gamma-Ray Bursts.The satellite has four instruments to detect and localize the prompt GRB emissi...SVOM(Space-based multiband astronomical Variable Objects Monitor)is a Chinese-French space mission dedicated to studying Gamma-Ray Bursts.The satellite has four instruments to detect and localize the prompt GRB emission and measure the evolution of the afterglow in the visible band and in X-rays,and a VHF communication system enabling the fast transmission of SVOM alerts to the ground.The ground segment includes an array of wide-angle cameras and two follow-up telescopes.It was planned to be in orbit in 2021,and now has to be delayed about six months because of COVID-19 epidemic.展开更多
We analyze the optical spectra of Fairall 9,a luminous Seyfert 1 galaxy.They are obtained from the AGN Watch program that has monitored this object for 9 months.The flux and variation of the optical FeII complex is me...We analyze the optical spectra of Fairall 9,a luminous Seyfert 1 galaxy.They are obtained from the AGN Watch program that has monitored this object for 9 months.The flux and variation of the optical FeII complex is measured using multi-component profile modeling with FeⅡ templates.A convincing intrinsic Baldwin Effect(BEff) of optical FeⅡ emission blends in Fairall 9 is discovered for the first time.The variation of FeⅡ/Hβ(RFe) in Fairall 9 is obtained.We also detect a marginal anti-correla tion between RFe and the continuum flux in its spectra.This anti-correlation and the relatively broad profile of Hβ in this galaxy support the dichotomy reported by Wang et al.(2005).展开更多
The Lunar-based Ultraviolet Telescope (LUT) is a funded lunar-based ultraviolet telescope dedicated to continuously monitor- ing variable stars for as long as dozens of days and performing low Galactic latitude sky ...The Lunar-based Ultraviolet Telescope (LUT) is a funded lunar-based ultraviolet telescope dedicated to continuously monitor- ing variable stars for as long as dozens of days and performing low Galactic latitude sky surveys. The slow and smooth spin of the Moon makes its step by step pointing strategy possible. A flat mirror mounted on a gimbal mount is configured to enlarge the sky coverage of the LUT. A Ritehey-Chretien telescope with a Nasmyth focus configuration is adopted to reduce the total length of the system. A UV enhanced back illuminated AIMO CCD 47-20 chip together with the low noise electric design will minimize the instrumental influence on the system. The preliminary proposal for astrometric calibration and photometric cali- bration are also presented.展开更多
With the 2.16 m telescope at Beijing Astronomical Observatory, it is identified that a compact X-ray source detected by ROSAT located in the vicinity of 5’ .9 from the LINER galaxy NGC4579 is a quasar with a redshift...With the 2.16 m telescope at Beijing Astronomical Observatory, it is identified that a compact X-ray source detected by ROSAT located in the vicinity of 5’ .9 from the LINER galaxy NGC4579 is a quasar with a redshift z = 0.106. A further analysis indicates that this quasar is possibly ejected from NGC4579.展开更多
基金Supported by the Civil Science Satellite Engineering Project of State Administration of ScienceTechnology and Industry for National Defence。
文摘SVOM(Space-based multiband Variable Object Monitor)is a Chinese-French space mission mainly designed to study Gamma-Ray Bursts.The satellite carries four instruments to detect and localize the prompt GRB emission and measure the evolution of the afterglow in the visible band and in soft X-rays,and a VHF communication system enables the fast transmission of SVOM alerts to the ground.The ground segment includes an array of wide-angle cameras and two follow-up telescopes.It was launched into an orbit of about 635 km on 22 June 2024,with three years of nominal operations and an extension of two years.
文摘SVOM is a mission dedicated for studying γ-Ray Bursts, and will also be a powerful target-ofopportunity observatory for the whole astronomy community. The mission has been approved jointly by both Chinese and French space agencies. It is planned to be in the orbit in 2021 with an altitude ≤600 km and an inclination ≤30°.
文摘SVOM(Space-based multiband astronomical Variable Objects Monitor)is a Chinese-French space mission dedicated to studying Gamma-Ray Bursts.The satellite has four instruments to detect and localize the prompt GRB emission and measure the evolution of the afterglow in the visible band and in X-rays,and a VHF communication system enabling the fast transmission of SVOM alerts to the ground.The ground segment includes an array of wide-angle cameras and two follow-up telescopes.It was planned to be in orbit in 2021,and now has to be delayed about six months because of COVID-19 epidemic.
基金supported by the National Natural Science Foundation of China (Grant Nos.10803008, 10833005 and 10573028)the National Basic Research Program of China (Grant Nos.2009CB824800 and 2007CB815402)the Group Innovation Project (Grant No.10821302)
文摘We analyze the optical spectra of Fairall 9,a luminous Seyfert 1 galaxy.They are obtained from the AGN Watch program that has monitored this object for 9 months.The flux and variation of the optical FeII complex is measured using multi-component profile modeling with FeⅡ templates.A convincing intrinsic Baldwin Effect(BEff) of optical FeⅡ emission blends in Fairall 9 is discovered for the first time.The variation of FeⅡ/Hβ(RFe) in Fairall 9 is obtained.We also detect a marginal anti-correla tion between RFe and the continuum flux in its spectra.This anti-correlation and the relatively broad profile of Hβ in this galaxy support the dichotomy reported by Wang et al.(2005).
基金supported by the Ministry of Science and Technology of China and the National Natural Science Foundation of China (Grant Nos. 10803008, 10978020 and 10878019)
文摘The Lunar-based Ultraviolet Telescope (LUT) is a funded lunar-based ultraviolet telescope dedicated to continuously monitor- ing variable stars for as long as dozens of days and performing low Galactic latitude sky surveys. The slow and smooth spin of the Moon makes its step by step pointing strategy possible. A flat mirror mounted on a gimbal mount is configured to enlarge the sky coverage of the LUT. A Ritehey-Chretien telescope with a Nasmyth focus configuration is adopted to reduce the total length of the system. A UV enhanced back illuminated AIMO CCD 47-20 chip together with the low noise electric design will minimize the instrumental influence on the system. The preliminary proposal for astrometric calibration and photometric cali- bration are also presented.
文摘With the 2.16 m telescope at Beijing Astronomical Observatory, it is identified that a compact X-ray source detected by ROSAT located in the vicinity of 5’ .9 from the LINER galaxy NGC4579 is a quasar with a redshift z = 0.106. A further analysis indicates that this quasar is possibly ejected from NGC4579.