Astronomers detect most distant hydroxyl gigamaser at 8 billion light years with MeerKAT

South African astronomers have detected the most distant hydroxyl megamaser ever recorded, coming from a violently merging galaxy located more than 8 billion light-years from Terra. The signal, captured by the MeerKAT radio telescope, on África of Sul, stands out for its exceptional intensity, leading researchers to classify it as a gigamaser. Essa emission occurs in a galactic system observed when the universe was less than half its current age.

The phenomenon involves hydroxyl molecules that, under extreme gas density conditions, amplify radio waves in a similar way to a natural laser. The detection was facilitated by a gravitational lens formed by a foreground galaxy, which curved space-time and intensified the signal received in Terra.

The object, designated HATLAS J142935.3–002836, presents a complex spectrum with emission components at 1667 MHz and 1665 MHz. The integrated luminosity, without correction for magnification, reaches values ​​that surpass previous records, confirming its position as the brightest and most remote of its type.

MeerKAT detection details

The MeerKAT radio telescope, with its high sensitivity at centimeter wavelengths, allowed the signal to be captured in an observation lasting just a few hours. The team processed the data with advanced algorithms to identify the specific hydroxyl signature.

The discovery occurred in the context of surveys that aim to explore megamasers at high redshifts. The target system was selected for its strong gravitational lensing, previously identified in multi-wavelength observations.

The researchers highlight that the combination of MeerKAT with the lens effect resulted in significant amplification. Isso made it possible to detect emissions that would otherwise remain below the sensitivity threshold.

Galactic merger as the origin of the phenomenon

Collisions between gas-rich galaxies compress molecular clouds in large quantities. Esse process stimulates hydroxyl molecules to emit amplified radiation at wavelengths of about 18 cm.

In the observed case, the majority merger involves components with close stellar mass proportions. Altas rates of star formation and large reservoirs of molecular gas characterize the environment.

These events are important markers of galactic evolution in the early universe. The intense emission reflects extreme gas densities and high dynamic activity.

Amplification by gravitational lensing

Gravitational lensing, predicted by general relativity to be Einstein, acts when a massive galaxy aligns between the distant source and the observer. The curvature of spacetime redirects and intensifies radio waves.

In the HATLAS system J142935.3–002836, the foreground galaxy at z=0.218 creates a nearly complete ring of Einstein. Lens Modelos based on near-infrared data indicates magnification factor between 8 and 10 in various spectral ranges.

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This natural amplification allowed us to observe fine spectral details. Componentes with widths ranging from less than 8 km/s to about 300 km/s reveal complexity in the gas dynamics.

Spectral characteristics of the gigamaser

The spectrum displays mixed emission lines with highly structured profiles. The main components correspond to classical hydroxyl transitions at radio frequencies.

The high apparent luminosity classifies the object as a gigamaser, exceeding the typical megamaser threshold. Essa intensity reflects both the intrinsic source and the gain by the lens.

Importance for high redshift studies

Hydroxyl megamasers serve as tracers of galactic mergers in ancient cosmological epochs. Detection at z ≈ 1.027 expands the observational range beyond previous limits.

MeerKAT demonstrates the ability to radio explore the universe at extreme distances. Futuras observations with more sensitive arrays can reveal larger populations of these objects.

The discovery reinforces the role of facilities like MeerKAT in modern radio astronomy. Colaborações international institutions contribute to processing and interpreting the data collected.

Composition of the galactic system

The host object has a stellar mass estimated at around 1.3 × 10¹¹ solar masses. The interstellar gas content reaches values ​​close to 4.6 × 10¹⁰ solar masses.

High rate of star formation, derived from infrared observations, indicates intense starburst environment. The presence of multiple components suggests fusion in progress.

These properties align with models of galaxy evolution at moderate to high redshifts. The study provides valuable data for comparisons with cosmological simulations.

The discovery opens up new possibilities for investigating merger physics on cosmological scales. The powerful signal offers a unique window into processes that shaped galaxies in the young universe.