Supermassive black holes face growth slowdown due to lack of cold gas

The growth of supermassive black holes has slowed steadily over the past ten billion years. Pesquisadores reached this conclusion after analyzing data from around 1.3 million galaxies and 8 thousand active black holes. The main cause is the reduction in the availability of cold gas, the fuel that these objects consume to increase their mass.

Supermassive black holes have a mass equivalent to millions or billions of times that of Sol and are at the center of most galaxies, including Via Láctea. Sua intense gravity influences the formation of stars and the evolution of galaxies. The emission of X-rays from heated gas near the event horizon serves as an indicator of the accretion rate, that is, the speed at which the black hole consumes matter.

What are supermassive black holes

A supermassive black hole concentrates extreme mass into a very small volume. Nada Escapes its event horizon not even light. Esses objects exert influence on the surrounding gas and stars, affecting the development of the host galaxy over billions of years.

Most galaxies harbor a supermassive black hole at their core. In the case of Via Láctea, the central object has an estimated mass of around four million times that of Sol. Estudos show that these giants play an important role in regulating stellar activity and the dynamics of interstellar gas.

Peak period of cosmic activity

About ten billion years ago, the universe went through a phase known as cosmic noon. Nessa epoch, both star formation and black hole growth reached the highest level in cosmic history. Galaxies had large reserves of cold gas, which fueled both the birth of new stars and the accretion into active nuclei.

X-ray observations from telescopes such as Chandra, XMM-Newton and eROSITA made it possible to compare the activity of black holes at different times. The intensity of X-ray emission directly indicates the rate of matter consumption. In cosmic noon, this activity was much stronger than it is today.

Main reason for the slowdown

The gradual depletion of cold gas reservoirs in galaxies explains the reduction in growth rate. Over time, the available gas is converted into stars, expelled by supernova explosions, or heated and removed by winds and energetic jets from the black holes themselves. Sem Efficient replacement, the material to feed the active nuclei decreases.

• Star formation consumes interstellar gas in large quantities
• Supernova explosions heat up and expel some of the remaining gas
• Jets and radiation from black holes sweep away material from central regions
• Less cold gas results in lower accretion rate
• The process affects both star formation and the growth of black holes

This sequence shows how galaxies lose the ability to sustain intense activity over time. The average accretion rate has dropped significantly since cosmic noon.

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How the data was obtained

Astronomers have combined information from multiple X-ray observatories to map the activity of thousands of black holes at different distances and times. The analysis included around 8,000 active objects and made it possible to separate the effects of mass, number of growing black holes and individual rate of consumption.

The results indicate that the main slowdown comes from the drop in the accretion rate per black hole, and not just from a reduction in the number of active objects or their average masses. The weaker X-ray emission today directly reflects the lower consumption of matter. Estudos crossed with observations in other wavelength bands reinforce the fuel shortage scenario.

Impact on the evolution of galaxies

With less cold gas available, galaxies form fewer stars and exhibit less luminous cores. Muitas Galaxies become redder and poorer in gas, entering a phase of reduced activity. Supermassive black holes remain present, but with slow or nearly stagnant growth most of the time.

This situation contributes to a less turbulent universe than it was in his youth. In the long term, the cosmos tends to be dominated by old stars, orphan planets and black holes with already consolidated masses. The observations help paint a picture of cosmic history and the future fate of large-scale structures.

Perspectives for new observations

Current and future telescopes must continue to map activity in X-rays and other bands to refine evolution models. Combining data from multiple instruments makes it possible to test different hypotheses about the matter consumption and energetic feedback of black holes on their host galaxies.

The recent results reinforce the link between the gas supply and the growth rate of both stars and black holes. Eles offer clues about how the universe went from an active phase to the calmer state observed today.