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A new giant radio galaxy has been detected

Alcyoneus joint wireless infrared view. Credit: Oei et al. , 2022.

European astronomers have reported the detection of a new giant radio galaxy (GRG) as part of a LOFAR 2-meter sky survey (LoTSS). The newly discovered object, named Alcyoneus, turned out to be the largest GRG known to date. The findings are detailed in a paper published on February 11th at the arXiv Preprint Repository.


GRG is Radio galaxy Overall projected linear length exceeds at least 2.3 million Light year.. They are rare objects that grow in low density environments. In general, GRG is important for astronomers to study the formation and evolution of radio sources.

So far, about 1,000 GRGs have been detected, only 10 of which are over 10 million light-years. The largest is J1420-0545, which is estimated to have a proper length of about 16 million light-years.Therefore, GRG and other megaparsec scale radios Galaxy It is supposed to be the largest single galaxy-induced phenomenon in the universe.

Currently, a team of astronomers led by Martijn SSL Oei of Leiden University in the Netherlands has discovered a new giant radio galaxy that seems to be the largest of the other known GRGs. The findings were made by analyzing a second data release (DR2) from LoTSS.

“The latest version of LOFAR’s Northern Sky study, LoTSSDR2, is reprocessed by subtracting an angularly compact source and imaging at 60-inch and 90-inch resolutions. New sensitivity regimes can be explored, representing promising data for searching galaxy lobes, and therefore unknown GRGs of large angle length, “the researchers wrote in the paper.

Astronomers have identified a three-component radio structure that turned out to be a giant radio galaxy with a central (jet-like) component and two outer (robe-like) components.They dubbed this GRG Alcyoneus and found it to have a predicted proper length of about 16.26 million light-years, but its true proper length was estimated to be 16.43 million. Light Year. This makes it the largest known structure created by a single galaxy.

Studies show that Alcyoneus has a total luminous intensity density of about 80 YW / Hz at 144 MHz. Therefore, it is typical of a huge radio galaxy. The host of this GRG was found to be the elliptical galaxy J081421.68 + 522410.0. Stellar mass With about 240 billion solar mass Supermassive black hole (SMBH) Mass approx. 400 million Solar mass..

The authors of the paper state that Alcyoneus hosts have significantly lower stellar masses and SMBH masses when compared to other GRG hosts. According to them, this may not be a strong positive correlation between radio galaxy length and (instantaneous) low-frequency radio power, stellar mass, or SMBH mass within the GRG population. Suggests.

“Therefore, no very large galaxy or central black hole is needed to grow a large giant. Neither is high if the observed condition represents the source throughout its life. wireless Power. ”


Astronomers find the largest radio galaxy ever


For more information:
Martijn SSL Oei et al, discovery of a radio galaxy of at least 5Mpc. arXiv: 2202.05427v1 [astro-ph.GA], arxiv.org/abs/2202.05427

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Quote: The new giant radio galaxy detected (February 21, 2022) was obtained from https://phys.org/news/2022-02-giant-radio-galaxy.html on February 21, 2022. rice field

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A new giant radio galaxy has been detected

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