Chongfan Technology
News
15
2024
-
08
Nanjing University's latest Nature!
Author:
Almost all massive galaxies contain a supermassive black hole (BH) at their core. The feedback from these black hole accretions is generally considered to play a crucial role in determining the quiescent state of massive galaxies, although some recent studies have shown that even galaxies with the most active black holes do not exhibit molecular gas reservoirs or a reduction in the rate of star formation.As a result, the effect of black holes on star formation in galaxies remains highly controversial and direct evidence is lacking.
On August 14, 2024, the Wang Tao team of Nanjing UniversityNaturePublished online entitled"Black holes regulate cool gas accretion in massive galaxies"'s research paper,The studyshowing that black holes regulate the accretion of low-temperature gas in massive galaxies.
Here, based on a large sample of nearby galaxies, the masses of black holes and atomic hydrogen (HI), the main component of the interstellar medium, are measured. The study shows that the ratio of the HI gas mass to the stellar mass (μHI = MHI/M*) and the black hole mass (MBH) is stronger than any other galaxy parameter (including stellar mass, stellar mass surface density, and bulge mass). Furthermore, once consideredμHI-MBHcorrelation, μHI loses its dependence on other galaxy parameters, suggesting thatMBHYesμHIThe main drivers.These findings provide important evidence for how the energy accumulated by BH accretion regulates the cold gas content in galaxies by ejecting interstellar medium gas and/or inhibiting the cooling of gas from the ring galaxy medium.
The study innovatively starts with exploring the relationship between the mass of black holes in nearby galaxies and the content of atomic hydrogen in galaxies, revealing for the first time that the mass of the central black hole in a galaxy is the most critical physical quantity that modulates the content of atomic hydrogen in a galaxy: the higher the mass of the central black hole, the lower the content of atomic hydrogen in a galaxy.Atomic hydrogen gas is the main component of cold gas in galaxies, and cold gas is the raw material for star formation in galaxies. Therefore, this discovery provides important observational evidence for whether and how the black hole in the center of galaxies affects the content of cold gas and star formation in galaxies.
The results of the central black hole on the host galaxy specific feedback mechanism also made important restrictions. Because the atomic hydrogen gas is the primary product of the cooling of the gas around the galaxy.The discovery means that regulating the cooling efficiency of the gas around the galaxy through the energy released by the central black hole during its growth is likely to be the main way the central black hole affects the formation and evolution of the host galaxy.
Chongqing Chongfan Technology Co., Ltd. Optical platform film thickness meter OCT optical coherence tomography LabVIEW control
LATEST NEWS
Thank you for visiting the official website of Chongfan Technology. If you have cooperation intentions or suggestions, please contact us through the following methods, and we will reply as soon as possible, thank you!
Address: Room 403, Building 6, Phase III of R&D, No. 36 Xiyong Avenue, High tech Zone, Chongqing, China.
Telephone: +86-13658337211
E-mail: Sales@cfkeji.net
Website: www.cfkeji.net
Mobile Version
