Friday , March 5 2021

Astronomers reveal the map of the Milky Way galaxy, indicating that the “Earth” is approaching the black hole faster

On the left, an optical image from the digital sky survey shows Cygnus X-1, sketched in a red box. Cygnus X-1 is located near large active star-forming regions of the Milky Way, as seen in this image spanning about 700 light-years in diameter. The illustration of an artist on the right shows what astronomers think is happening within the Cygnus X-1 system. Cygnus X-1 is a so-called black hole of stellar mass, a class of black holes that comes from the collapse of a massive star. New studies with data from Chandra and several more telescopes have determined the rotation, mass and distance of the black hole with unprecedented accuracy.

Astronomers reveal the map of the Milky Way galaxy, indicating that the “Earth” is approaching the black hole faster

On January 23, the NARIT National Institute for Astronomical Research is revealed via the Facebook page In the movement of the world Approaching the black hole faster than before, with

“Latest map of the Milky Way Indicates that the Earth is approaching the black hole faster than before

The researcher, Dr., joins an international team of astronomers Data were collected through Japan’s VERA remote radio interference telescope network. He found that the world is moving faster at a rate of 7 kilometers per second and closer to the supermassive black hole in the center of the Milky Way galaxy However, about 2,000 light-years less, our planet does not it will be easily absorbed into the black hole. The findings of the research were published in the publications of the Astronomical Society of Japan in August 2020.

This is because our Earth is part of the solar system and is located within the Milky Way galaxy. Therefore, it is not easy to grasp the nature of the galaxies in which we live. A specific technique in astronomy is needed to measure the position and study the motion of an object, known as astrometry. This includes the position of our solar system in the Milky Way galaxy, which from 2020, the VERA Exploration of Radio Astrometry (VLBI) project Long Baseline Interferometry (“VLBI”, the country’s very long interferometry project) . The results of observations of 99 astronomical objects were summarized and published in a first catalog of astronomical measurements of distance.

The VERA project has been studying three-dimensional velocity mapping and the spatial structure of the Milky Way galaxy since 2000, using a special technique called data interpolation of multiple radio telescopes. It is as powerful as a radio telescope with a facial width of 2,300 km and provides an accurate angular resolution of up to 10 μF (equivalent to being able to see a dollar on the moon).

Astronomers created a position and velocity map from this catalog. Together with the results of observations from other research groups, it is possible to calculate the center of the Milky Way galaxy. In addition, this map indicates the center of galaxies with supermassive black holes. It is located 25,800 light-years from Earth, which was found to be shorter than the original (27,700 light-years) that the International Astronomical Union or IAU (International Astronomical Union) calculated in 1985 and is still found. . center of the Milky Way galaxy at an average speed of 227 kilometers per second. It is compared to the previously calculated standard speed of 220 km / s. Therefore, it was found to be 7 kilometers per second faster than before
The VERA project has set more observational goals. In particular, objects near the supermassive black hole in the center of the Milky Way galaxy. Provide the most complete information to improve the effect, structure and motion of galaxies. In collaboration with the East Asian Long Distance Radio Interference Telescope Network, the EAVN (East Asia VLBI Network) works with radio telescopes from various stations in countries such as Japan, South Korea. and China, as the number of cameras increases and is more distant. quant You will only be able to analyze the data more accurately

For the East Asian Long Range Radio Telescope (EAVN) (EAVN), KaVA is a networked radio telescope array composed of the VERA (VLBI Exploration of Radio Astrometry) network in Japan. It consists of four 20 m diameter radio telescopes and a KVN (Korean VLBI Network) in South Korea. Consisting of three 21-meter-diameter radio telescopes in the future, the KaVA network will have more international cooperation through EAVN with other countries such as China, South Korea, as well as the Thai national radio telescope.

Researcher of Dr. Koichiro Sugiyama (Dr. Koichiro Sugiyama) in the birth of massive stars. As a co-author of this article, Radio Astronomy Research Group said, “MD is currently working on a project to develop the radio astronomy network and the Yeonzi. He built the 40-meter-long National Radio Astronomy Observatory in Southeast Asia. It plans to join the East Asian Long Range Radio Interference Telescope (EAVN) network with other radio telescopes. Help increase the potential of the network and better develop the system Especially Location of the national radio telescope It is located in the southern hemisphere, the most compared to other cameras in the network, which makes it good for detecting signals with an intensity of flow low. Better resolution Increase the chance of observing objects in the southern hemisphere Includes supermassive black holes Along with better image processing »

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