Giant black holes and their galaxies grow up side-by-side

The special relationship between supermassive black holes and their host galaxies begins early in the galaxy’s formation, according to new research.

The relationship also has a say in how both the galaxy and the supermassive black hole (SMBH) at its center grow over time, the researchers note.

A black hole is a point in space where matter has compacted so tightly that it creates intense gravity. This gravity is strong enough that even light can’t escape its pull. Black holes can be as small as a single atom or as large as billions of miles in diameter. The biggest, called “supermassive” black holes, have masses equal to that of millions—or even billions—of suns.

SMBHs are often at the center of large galaxies, including our own galaxy, the Milky Way. Although scientists theoretically expected SMBHs to exist, they detected the first observational hints in the 1960s. Earlier this year, the Event Horizon Telescope released the first silhouette of a black hole in the galaxy Messier 87. Astrophysicists continue to theorize about the origins of black holes, how they grow and glow, and how they interact with host galaxies in different astronomical environments.

Supermassive black holes & their galaxies

“There has been a lot of uncertainty regarding the SMBH-galaxy connection, in particular whether SMBH growth was more tightly connected to the star formation rate or the mass of the host galaxy,” says senior investigator Priyamvada Natarajan, an astrophysicist at Yale University. “These results represent the most thorough theoretical evidence for the former—the growth rate of black holes appears to be tightly coupled to the rate at which stars form in the host.”

Natarajan has made significant contributions to our understanding of the formation, assembly, and growth of SMBHs, with respect to their environs. Her work speaks to the underlying question of whether these connections are mere correlations or signs of deeper causation.

Natarajan and her team used sophisticated sets of simulations to make the discovery. Called Romulus, the cosmological simulation follows the evolution of different regions of the universe from just after the Big Bang until the present day and includes thousands of simulated galaxies that reside in a wide variety of cosmic environments.

The Romulus simulations offer the highest-resolution snapshot of black hole growth, providing a fully emergent and sharper view of how black holes grow within a wide range of host galaxies, from the most massive galaxies located in the center of galaxy clusters—very dense regions like crowded city centers—to much more common dwarf galaxies that inhabit the sparser suburbs.

“At a time when the drivers of black hole growth are unclear, these simulations offer a simple picture. They simply grow along with the stars independent of the galaxy’s mass, the larger environment, or the cosmic epoch,” says Angelo Ricarte, a former graduate student of Natarajan’s who is now a postdoctoral fellow at Harvard University.

Growing in tandem

One of the more intriguing findings of the study, Ricarte notes, has to do with the way the largest black holes in the universe interact with their host galaxies over time. The researchers found that SMBHs and their hosts grow in tandem, and that the relationship is “self-correcting,” independent of the kind of environment they inhabit.

“If the SMBH starts to grow too rapidly and gets too big for its galactic home, physical processes ensure that its growth slows down relative to the galaxy,” explains coauthor Michael Tremmel, a postdoctoral associate in the astronomy department.

“On the other hand, if the SMBH’s mass is too small for its galaxy, the SMBH’s growth rate increases relative to the size of the galaxy to compensate.”

The research appears in the journal Monthly Notices of the Royal Astronomical Society.

Thomas Quinn of the University of Washington is also a coauthor of the study. Support for the research came, in part, from NASA and the National Science Foundation.

Source: Yale University

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