CXC: Supermassive Black Holes Outgrowing Their Galaxies

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CXC: Supermassive Black Holes Outgrowing Their Galaxies

Post by bystander » Thu Feb 15, 2018 8:23 pm

Supermassive Black Holes Are Outgrowing Their Galaxies
NASA | MSFC | SAO | Chandra X-ray Observatory | 2018 Feb 15
The growth of the biggest black holes in the Universe is outrunning the rate of formation of stars in the galaxies they inhabit, according to two new studies using data from NASA's Chandra X-ray Observatory and other telescopes and described in our latest press release.

In this graphic an image from the Chandra Deep Field-South is shown. The Chandra image (blue) is the deepest ever obtained in X-rays. It has been combined with an optical and infrared image from the Hubble Space Telescope (HST), colored red, green, and blue. Each Chandra source is produced by hot gas falling towards a supermassive black hole in the center of the host galaxy, as depicted in the artist's illustration.

One team of researchers, led by Guang Yang at Penn State, calculated the ratio between a supermassive black hole's growth rate and the growth rate of stars in its host galaxy and found it is much higher for more massive galaxies. For galaxies containing about 100 billion solar masses worth of stars, the ratio is about ten times higher than it is for galaxies containing about 10 billion solar masses worth of stars. ...

Another group of scientists, led by Mar Mezcua of the Institute of Space Sciences in Spain, independently studied 72 galaxies located at the center of galaxy clusters at distances ranging up to about 3.5 billion light years from Earth and compared their properties in X-ray and radio waves. Their work indicates that the black hole masses were about ten times larger than masses estimated by another method using the assumption that the black holes and galaxies grew in tandem. ...

Linking black hole growth with host galaxies: The accretion–stellar mass relation and its cosmic evolution - G. Yang et al The most massive black holes on the Fundamental Plane of black hole accretion - M. Mezcua et al
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Montreal: "Ultramassive" Black Holes Discovered in Far-Off Galaxies

Post by bystander » Tue Feb 20, 2018 5:26 pm

Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
— Garrison Keillor

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