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Five new giant radio galaxies discovered

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One of new GRGs described in the study. The figure shows radio-near infrared overlay of this source, using SDSS i-band image rather than WISE, given its better angular resolution. Credit: Tang et al., 2020 With the help of citizen scientists, astronomers have detected five new giant radio galaxies (GRGs). The new GRGs have sizes ranging from 2.3 to 2.6 million light years, and have been identified at redshift between 0.28 and 0.43. The finding is reported in a paper published September 8 on the arXiv pre-print server.

GRGs are radio galaxies with an overall projected linear length exceeding at least 2.28 million light years . They are rare objects grown in low-density environments. GRGs are important for astronomers to study the formation and the evolution of radio sources.

Now, a team of astronomers led by Hongming Tang of the University of Manchester, UK, reports the finding of five previously unknown GRGs. The detection is based on the Data Release 1 (DR1) of the Radio Galaxy Zoo (RGZ) citizen science project. RGZ DR1 is a manually cross-matched radio galaxy catalog using the efforts of more than 12,000 citizen scientist volunteers.

“In this paper, we present the identification of five previously unknown giant radio […]

read more here —> phys.org

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