A groundbreaking discovery has revealed the presence of a blazar—a supermassive black hole with a jet pointed directly at Earth—at an extraordinary redshift of 7.0. The object, designated VLASS J041009.05−013919.88 (J0410−0139), is the most distant blazar ever identified, providing a rare glimpse into the epoch of reionization when the universe was less than 800 million years old. This discovery challenges existing models of black hole and galaxy formation in the early cosmos.
J0410−0139 is powered by a black hole with a mass of 700 million times that of the Sun. Multi-wavelength observations show that its radio variability, compact structure, and X-ray properties identify it as a blazar with a jet aligned toward Earth. Blazars are rare and account for only a small fraction of all quasars. The discovery of J0410−0139 implies the existence of a much larger population of similar jetted sources in the early universe. These jets likely enhance black hole growth and significantly affect their host galaxies.
Observations with instruments such as the U.S. National Science Foundation Very Large Array (NSF VLA), the NSF Very Long Baseline Array (NSF VLBA), the Chandra X-ray Observatory, and the Atacama Large Millimeter/submillimeter Array (ALMA) indicate that J0410−0139 exhibits radio emission amplified by relativistic beaming, a hallmark of blazars. Its spectrum also confirms stable accretion and emission regions typical of active black holes. This discovery raises questions about how supermassive black holes grow so rapidly in the universe’s infancy. Models may need to account for jet-enhanced accretion or obscured, super-Eddington growth to reconcile this finding with the known black hole population at such high redshifts.
“This blazar offers a unique laboratory to study the interplay between jets, black holes, and their environments during one of the universe’s most transformative epochs,” said Dr. Emmanuel Momjian of the NSF National Radio Astronomy Observatory, a co-lead of the study, “The alignment of J0410−0139’s jet with our line of sight allows astronomers to peer directly into the heart of this cosmic powerhouse.”
The existence of J0410−0139 at such an early time suggests that current radio surveys might uncover additional jetted quasars from the same era. Understanding these objects will illuminate the role of jets in shaping galaxies and growing supermassive black holes in the early universe.
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