New Discoveries on Supermassive Black Hole Growth: Insights from Distant Quasars

Researchers Discover Rapid Growth of Supermassive Black Holes

Researchers using XMM-Newton and Chandra telescopes have found that X-ray emissions from 21 distant quasars relate to the fast growth of supermassive black holes in the early Universe. Their study challenges traditional physics by revealing super-Eddington accretion rates.

This study, published in Astronomy & Astrophysics, explains how supermassive black holes—each billions of times more massive than our Sun—formed quickly, within less than a billion years after the Big Bang. Researchers from the National Institute for Astrophysics (INAF) studied some of the most distant quasars detected.

The findings indicate that these black holes grew through rapid and intense accumulation of matter, explaining their significant masses in the early Universe.

Quasars are bright active galaxies powered by supermassive black holes at their centers, known as active galactic nuclei. These black holes emit tremendous energy as they consume matter, making quasars among the brightest and farthest objects known. The quasars in this research date back to a time when the Universe was under a billion years old.

Insights from X-ray Emissions

The study revealed an unexpected connection between the X-ray emissions from quasars and the speed of matter winds ejected by them. This relationship links wind speed, which can reach thousands of kilometers per second, to the temperature of gases near the black hole.

Quasars showing low-energy X-ray emissions have faster winds, indicating rapid growth that surpasses a physical limit known as the Eddington limit. This high growth phase is termed “super-Eddington.” In contrast, quasars with higher-energy X-ray emissions exhibit slower winds.

Lead author Alessia Tortosa stated that the discovery connects X-ray emissions and winds, providing insight into how these massive black holes formed in a brief time, revealing a significant mystery in modern astrophysics.

HYPERION Project and Observations

The study mainly utilized data from the XMM-Newton space telescope, allowing around 700 hours of observations of the chosen quasars. Most data was gathered between 2021 and 2023 as part of the Multi-Year XMM-Newton Heritage Programme under the HYPERION project, which studies hyperluminous quasars from the cosmic dawn.

Luca Zappacosta, a researcher at INAF, highlighted the careful selection of quasars, aiming for those that had gained the most mass. The research has yielded surprising results that support the super-Eddington growth mechanism.

Future of X-ray Astronomy

These findings are important for upcoming X-ray missions like ATHENA (ESA), AXIS, and Lynx (NASA), scheduled for launch from 2030 to 2040. The results will help refine observational tools and improve strategies for studying black holes and active galactic nuclei in earlier cosmic epochs, enhancing our understanding of the formation of the first galaxies in the early Universe.

Reference: “HYPERION. Shedding light on the first luminous quasars: A correlation between UV disc winds and X-ray continuum” by Alessia Tortosa et al., Astronomy & Astrophysics. DOI: 10.1051/0004-6361/202449662.