The latest astronomical research results of the Chinese Academy of Sciences: the first time to achieve the geometric distance measurement of quasars

Recently, the Institute of High Energy Physics of the Chinese Academy of Sciences announced that a team led by Wang Jianmin researchers has developed a new geometric ranging method to analyze GRAVITY interference data through simulation, as well as the Lijiang 2.4-meter telescope, the United States Steward Observatory Bok The 2.3-meter telescope’s 10-year response mapping data successfully measured the cosmic distance of a quasar numbered 3C 273.

Measuring the cosmic distances of quasars has been a major challenge for astronomers more than half a century after their discovery. The European Southern Observatory’s nearly 10-year-old GRAVITY (gravity) installation, mounted on the world’s most advanced VLTI, was successfully measured by the GRAVITY team for the quasar 3C between 2017 and 2018 The wide-line angle of 273 is 46 microangular seconds, which is the highest spatial resolution observation of the active galaxy’s nuclear wide-line region.

The latest astronomical research results of the Chinese Academy of Sciences: the first time to achieve the geometric distance measurement of quasars

Wang Jianmin’s research team began to use the Lijiang 2.4-meter telescope of the Yunnan Observatory of the Chinese Academy of Sciences to monitor the wide-line region of the active galactic nucleus for a long time, and obtained the physical scale, gas geometry and dynamic state of the wide-line area by means of the maximum entropy, Markov chain Monte Carlo and other methods, through the response mapping observation technology, the maximum entropy, the Markov chain Monte Carlo, etc. Measure data such as the mass of the central black hole.

According to the Chinese Academy of Sciences: “These two sets of independent observation data are complementary, GRAVITY observation is the angle of the wide line area, the response mapping observation is the physical dimensions, the combination of the two can achieve high-precision ranging.” “

With a direct measurement of the distance of the 3C 273 quasar about 2 billion light-years from Earth, the 3C 273 quasar provides a new way to solve the Hubble constant crisis, and will help in the future in accurately measuring the geometry of the universe and studying the velocity and history of the universe.

Now, the study has been published in Nature Astronomy, and the reviewers believe that “this method is of great help in improving the mass of black holes and the accuracy of the measurement of cosmic distances.” “