A team of thirty-four authors has measured the mass of an inactive black hole existing when the universe was ten billion years old, at a redshift of 2. Researchers led by Andrew B. Newman utilized stellar kinematics, typically reserved for studying nearby objects, to determine the black hole’s mass. This measurement was made possible by exploiting a gravitational lens that magnified the light from the galaxy MRG-M0138, allowing for detailed modeling of the stars within the black hole’s sphere of influence. The black hole’s mass is determined to be 6.0 − 1.7 + 2.1 × 109 solar masses, a value consistent with one established relationship between black hole mass and galaxy properties, but not another.
Gravitational Lensing Resolves Distant Black Hole Kinematics
A black hole ten billion years removed from our own has yielded its mass to a novel measurement technique, pushing the boundaries of stellar dynamics to cosmic distances. This achievement circumvents the usual limitations of resolving individual stars in such distant galaxies, relying instead on the distorting power of gravity. The team leveraged gravitational lensing, the bending of light around massive objects, to magnify the faint light emanating from the quiescent galaxy MRG-M0138. Observations of the gravitationally lensed quiescent galaxy MRG-M0138 at redshift 1.95 using James Webb Space Telescope integral field spectroscopy spatially resolved the kinematics of stars within the black hole’s sphere of influence. The resulting mass measurement, 6.0 − 1.7 + 2.1 × 109 solar masses, offers a crucial data point for understanding how black holes and galaxies co-evolved across cosmic time.
The measured mass is consistent with one local scaling relation linking black hole mass to bulge mass, but inconsistent with another. Determining the evolution of these correlations requires precise measurements of the masses of distant black holes, highlighting the importance of this work in refining cosmological models. The observations were made possible by the James Webb Space Telescope’s integral field spectroscopy, which allowed for detailed mapping of stellar velocities within the lensed galaxy, providing the data necessary to constrain the black hole’s gravitational influence.
MRG-M0138 Black Hole Mass Determination at Redshift 1.95
Determining the masses of distant supermassive black holes remains a significant challenge in astrophysics, typically relying on indirect methods that correlate black hole mass with galaxy properties. These empirical scaling relations, while useful, face uncertainties when applied to the early universe where conditions differed substantially from those observed locally. Recent advances, however, are beginning to directly measure black hole masses at cosmological distances, offering crucial tests of these relationships and refining our understanding of galactic evolution. A team led by Andrew B. Newman, with contributions from thirty-four authors, measured the mass of an inactive supermassive black hole in galaxy MRG-M0138 at redshift 1.95, corresponding to a time when the universe was approximately ten billion years old. This measurement represents one of the most distant inactive supermassive black holes with a directly determined mass using stellar dynamics.
The team took advantage of a gravitational lens, a phenomenon predicted by Einstein’s theory of general relativity, to magnify the light from the distant galaxy hosting MRG-M0138. Determining the evolution of these correlations requires precise measurements of the masses of distant black holes. By analyzing these stellar movements, the team calculated the black hole’s mass to be 6.0 − 1.7 + 2.1 × 109 solar masses. This collaborative effort involved researchers from numerous institutions, demonstrating the scale of international cooperation now required to tackle the most challenging questions in astrophysics. This finding underscores the importance of continued efforts to measure black hole masses at high redshifts.
Andrew B. Newman and his team took advantage of a gravitational lens that magnifies a distant galaxy. By using a foreground lens model and fitting stellar dynamical models, they determined the mass of its inactive black hole to be 6.0 − 1.7 + 2.1 × 109 solar masses. The resulting mass measurement is particularly valuable because it allows for a comparison with established scaling relations that connect black hole mass to galaxy properties.
James Webb Telescope Integral Field Spectroscopy Observations
The ability to accurately determine the mass of distant, inactive black holes is crucial for understanding how galaxies and the supermassive black holes at their centers co-evolve across cosmic time. This achievement relies on a technique called stellar kinematics, traditionally reserved for comparatively nearby galactic systems. A team of thirty-four authors, led by Andrew B. Newman, took advantage of a gravitational lens that magnifies a distant galaxy. The resulting mass determination for the black hole in galaxy MRG-M0138 is 6.0 − 1.7 + 2.1 × 109 solar masses. The research, detailed in Science, underscores the power of combining advanced observational capabilities with sophisticated modeling techniques to probe the universe’s distant past.
Black Hole Mass Scaling Relation Discrepancies
The assumption that supermassive black hole growth neatly parallels that of its host galaxy is increasingly challenged by observations of the distant universe, particularly as astronomers probe further back in cosmic time. This research focused on MRG-M0138, a gravitationally lensed quiescent galaxy, allowing for detailed analysis despite its immense distance. By analyzing these stellar movements, the team calculated the black hole’s mass to be 6.0 − 1.7 + 2.1 × 109 solar masses. Its value is consistent with one local scaling relation but inconsistent with another. Comparing this measurement to local galaxies, the mass is higher than expected given the galaxy’s bulge mass but consistent with the correlation of mass with stellar velocity dispersion.
Galaxy Evolution and Black Hole Mass Correlations
Supermassive black holes are inextricably linked to the galaxies they inhabit, evolving alongside their hosts over cosmic timescales. Understanding this co-evolution demands precise measurements of black hole masses at varying distances, a challenge recently addressed by an international team of thirty-four authors. The team surmounted a significant hurdle in determining the mass of this distant, quiescent black hole. By analyzing these stellar movements, the team calculated the black hole’s mass to be 6.0 − 1.7 + 2.1 × 109 solar masses, providing new insights into the relationship between galaxies and their central black holes.
