2021-04-30

British and Dutch astronomers have a better understanding of the habits of supermassive black holes at the center of galaxies

By yqqlm yqqlm

British and Dutch astronomers have a better understanding of the habits of supermassive black holes at the center of galaxies

Since 1950, astronomers have been working on active galaxies Ongoing research. When the supermassive black hole in the center of a galaxy is eating matter, it usually emits very strong radio or infrared/ultraviolet/X-ray radiation.

For example, a team of astronomers in the United Kingdom and the Netherlands have conducted in-depth ultra-sensitive radio telescope research on space and published two articles in the recently published “Astronomy and Astrophysics” journal article.

Previously, astronomers mainly focused on the collection of visible light, infrared/ultraviolet and other information, and the new observations have added more sensitive data from the radio telescope network, including the e- MERLIN and the European VLBI Network (EVN).

In the first article entitled “Radio Radiation from Active Galaxy Nuclei”, this international team of astronomers set their sights on all active galaxies in the GOOD-North region of the northern constellation Ursa Major. In the second article entitled “AGN Signal Selection and the Nature of the Host Galaxy”, three things are also clarified.

First of all, it turns out that the cores of many different types of galaxies present in addition to different ways of activity-some are extremely greedy (to swallow as much material as possible), some chew slowly, others are hungry Moderate death. Second, the research team accidentally discovered that the accretion phase can occur simultaneously with the star formation phase. Even if it is not so coincidental at times, if stars are forming in the current stage, it will be difficult for radio telescopes to detect the activity of the galaxy’s core. Third, no matter how fast the black hole swallows matter, the growth process of the galaxy’s core may or may not produce jets.

Principal researcher Jack Radcliffe said that radio telescopes are very important for studying the behavior of black holes in distant galaxies. But with the arrival of the SKA radio telescope, we will soon be able to gain a deeper understanding of the universe.

Study co-author Peter Barthel of the University of Groningen in the Netherlands added: There are more and more clues that all galaxies have supermassive black holes at the center, and the latest observations are making changes to their growth process. In-depth understanding.

Finally, the co-author of the study, Michael Garrett of the University of Manchester in the United Kingdom pointed out: These beautiful results prove the unique capabilities of radio astronomy. Telescopes such as VLA, e-MERLIN, and EVN are changing our view of how galaxies in the early universe evolved.