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An international team of astronomers led by Kathleen Charlton from the University of Cape Town in South Africa has discovered a new giant radio galaxy (GRG) using the
An international team of astronomers led by Kathleen Charlton from the University of Cape Town in South Africa has discovered a new giant radio galaxy (GRG) using the MeerKAT radio telescope. This GRG, designated MGTC J100022.85+031520.4, was previously unknown and was identified as part of the Cosmological Evolution Survey (COSMOS) MeerKAT International GHz Layered Extragalactic Exploration (MIGHTEE) study.
GRGs are rare objects characterized by an estimated total linear length exceeding at least 2.3 million light-years. They generally form in low-density environments and exhibit streams of synchrotron radiation plasma. GRGs play an important role in studying the formation and evolution of radio sources.
Researchers used MIGHTEE L-band data and new MeerKAT UHF-band observations to examine three GRGs in the COSMOS field. They presented spatially permissible spectral indices and age maps of these objects. One of the studied GRGs, MGTC J100022.85+031520.4, is new and was detected at a redshift of approximately 0.1034 in the elliptical galaxy SDSS J100022.85+031520.
The new GRG has an estimated linear size of approximately 4.2 million light-years, a mass of 93 trillion solar masses, and a total power of 597 ZW/Hz at 1284 MHz. The dynamic age of MGTC J100022.85+031520.4 is estimated at one billion years, and its jet has a power of one million quantum watts.
In particular, MGTC J100022.85+031520.4 is the central galaxy and the brightest galaxy in the WHL J100022.9+031521 galaxy cluster. This makes it one of only 4% of known clustered greenhouse gases. The curved morphology observed in the upper part of the new GRG suggests that it has properties similar to those of galaxies containing wide-angle tail (WAT) radio sources.
WAT radio sources are powerful and are often found in the centers of galaxy clusters, where the mean pressure can bend the particles into a characteristic C-shape. The discovery of MGTC J100022.85+031520.4 offers astronomers a new opportunity to study the formation and evolution of radio sources in galaxy clusters. The study was published on the arXiv preprint server on November 11.
Source: Port Altele
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