A loud active galactic nucleus has been detected in the proto-cluster SPT2349-56

A loud active galactic nucleus has been detected in the proto-cluster SPT2349-56

ATCA 2.2 GHz image of the SPT2349-56 region, with gold lines highlighting the 106 mJ extended LABOCA source at 870 μm. 20′ x 20′ magnification of ALMA 350 MHz continuous imaging (Hill et al. 2022) with overlays of ATCA 2.2 GHz (cyan), ASKAP 888 MHz (white). Credit: Chapman et al., 2023

Using the Australia Telescope Integrated Array (ATCA), an international team of astronomers has observed a submillimeter population of galaxies in a proto-cluster known as SPT 2349-56. As a result, they found a highly acoustic active galactic nucleus in the central region of the protocluster. The discovery is detailed in a paper published Jan. 3 in the arXiv Prepress server.

Galaxy clusters contain hundreds to thousands of galaxies bound together by gravity. They are the largest known gravitationally bound structures in the universe, and can serve as excellent laboratories for the study of galactic evolution and cosmology.

Astronomers are particularly interested in studies of protoclusters of galaxies, the progenitors of the clusters. Such objects, found at high redshifts (more than 2.0), can provide key information about the early universe.

Active galactic nuclei (AGNs) are supermassive black holes (SMBHs) that accumulate at the centers of some galaxies, emitting powerful, high-energy radiation as they collect gas and dust. These nuclei can form puffs, which mostly have cylindrical, conical or parabolic shapes, which are observed even on gigantic scales.

A group of astronomers led by Scott B. Chapman of Dalhousie University in Halifax, Canada, commissioned ATCA to observe SPT 2349-56 with the main goal of detecting the loudest active galactic nuclei in its Small Millimeter Group of Galaxies (SMGs). SPT 2349-56 is a protocluster at redshift 4.3, containing one of the most active star-forming cores known. The initial cluster hosts at least 30 SMGs.

“We observed the initial cluster Z=4.3 SPT2349-56 with the Australia Telescope’s Integrated Array with the goal of detecting highly acoustic active galaxy nuclei among ∼30 submm galaxies identified in structure,” the researchers write in the paper. .

Observations in SPT2349-56 detected a single radio source at 2.2 GHz, spatially synchronized with the three bright central galaxies of the protocluster, designated B, C, and G. The astronomers note that while this radio source is located near C, it cannot be ruled out that the radio emission is coming From B or G, or even from a group of galaxies.

The results indicate that the AGN is driving the newly discovered radio emission in the central region of SPT2349-56. This highly acoustic galactic nucleus has a sharp spectrum, with an index of −1.58, and its luminosity intensity at 2.2 GHz has been measured to be about 44 YW/Hz. The power of the radio jet of these two galactic nuclei is estimated to be about 100 trillion yW.

In summarizing the results, the astronomers added that no other clear signs of AGN activity have yet been detected in SPT2349-56. They emphasized that their discovery may help us better understand the formation and evolution of this protocluster.

The fact that radioactive germinal nuclei were detected in the putative central seed of BCG growth [brightest cluster galaxy] With a large star cluster already in place makes this discovery an important new component in understanding the formation and evolution of clusters.”

more information:
Scott C. arXiv (2023). doi: 10.48550/arxiv.2301.01375

Journal information:

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the quote: a loud active galactic nucleus in the proto-cluster SPT2349-56 (2023, January 12) was found on January 15, 2023 from https://phys.org/news/2023-01-radio-loud-galactic-nucleus- protocluster-spt2349 -.programming language

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