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中科院上海分院天文学家利用VLBI对首例中微子TDE事件给出约束条件（图）
天文学家 中微子TDE 天体物理学
2022/12/21
2022年3月13日，中国科学院上海天文台安涛研究员带领的团队利用甚长基线干涉测量技术（Very Long Baseline Interferometry, VLBI）探究了特殊潮汐撕裂事件AT2019dsg中高能中微子可能的产生机制，给出了目标源的射电余辉辐射模型，估算出其外流速度约为0.1倍光速，为该天体事件的物理和几何属性提供了约束条件。该研究结果扩大了多信使天体研究范围，并证明强大的相对论...
2017年1月6日，受新疆天文台青促会会员崔朗副研究员邀请，日本国立天文台吴元伟博士来访，并作了题为《VLBI天体测量与银河系结构》报告，拉开了2017年度新疆天文台青促会学术沙龙的序幕。
1.3 mm Wavelength VLBI of Sagittarius A*: Detection of Time-Variable Emission on Event Horizon Scales
Galaxy center — submillimeter general — techniques high angular resolution — techniques
2010/11/15
Sagittarius A*, the 4 × 106 M⊙ black hole candidate at the Galactic Center, can be studied on Schwarzschild radius scales with (sub)millimeter wavelength Very Long Baseline Interferometry (VLBI). We...
Evidence for Low Black Hole Spin and Physically Motivated Accretion Models from Millimeter VLBI Observations of Sagittarius A*
black hole physics—Galaxy center—techniques interferometric—submillimeter—accretion accretion
2010/11/15
Millimeter very-long baseline interferometry (mm-VLBI) provides the novel capacity to probe the emission region of a handful of supermassive black holes on sub-horizon scales. For Sagittarius A* (Sgr ...
Physical properties of blazar jets from VLBI observations
Cosmology and Extragalactic Astrophysics (astro-ph.CO) High Energy Astrophysical Phenomena (astro-ph.HE)
2011/1/5
Relativistic jets, formed in the vicinity of central supermassive black holes in AGN, show ample evidence connecting them to physical conditions in the accretion disc and broad-line region.
The compact radio source Sgr\,A*, associated with the super massive black hole at the center of the Galaxy, has been studied with VLBA observations at 3 frequencies (22, 43, 86\,GHz) performed on 10 c...
Extragalactic radio surveys are an increasingly popular method to investigate the evolution
of star-forming and active galaxies. However, their resolution is of the order of arcseconds and hence not ...