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Astronomers discover a new extragalactic circular radio source


Astronomers discover a new extragalactic circular radio source

Utilizing the Australian Sq. Kilometre Array Pathfinder (ASKAP), astronomers have detected a new extragalactic odd radio circle (ORC). The newfound radio source, designated ORC J0102–2450, has a diameter of almost 1 million gentle years. The discovering is reported in a paper revealed April 27 on arXiv.org.

Odd radio circles (ORCs) are very massive mysterious objects which can be extremely circular and vibrant alongside the sides at radio wavelengths. Though ORCs are vibrant at radio wavelengths, they can’t be noticed at seen, infrared or X-ray wavelengths. To this point, solely few objects of this kind have been recognized, therefore little or no is understood about their origin and nature.

Now, a group of astronomers led by Bärbel S. Koribalski of the Australia Telescope Nationwide Facility stories the latest addition to the quick listing of identified odd radio circles—ORC J0102–2450. The invention was made as a part of the seek for ORCs and different prolonged radio sources in a deep (about 40 deg2) ASKAP field centred close to the starburst galaxy NGC 253.

“We current the invention of one other odd radio circle (ORC) with the Australian Sq. Kilometre Array Pathfinder (ASKAP) at 944 MHz,” the researchers wrote within the paper.

The newly detected ORC has a radio ring diameter of round 70 arcseconds, or 978,000 gentle years. The source’s whole radio flux was measured to be some 3.9 mJy, whereas its whole radio luminosity was discovered to be roughly 140 billion TW/Hz. The item is almost definitely related to the central elliptical galaxy DES J010224.33–245039.5.

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Taking into consideration the general radio morphology of ORC J0102–2450 and non-detection of ring emission at non-radio wavelengths, the astronomers draw some conclusions concerning the origin of this ORC. They suppose that it may very well be a relic lobe of a big radio galaxy seen end-on or a big blast wave, probably from a binary supermassive black gap merger, leading to a radio ring of such massive dimension. A 3rd situation thought-about by the authors of the paper is that it may very well be a radio galaxy and intergalactic medium (IGM) interactions.

Nonetheless, the researchers added that extra discoveries of ORCs with ASKAP and different telescopes are wanted as a way to confirm the proposed hypotheses.

“We encourage the seek for additional ORCs in radio surveys to review their properties and origin (…) Low-frequency LOFAR surveys at high-resolution (6”) can be of explicit curiosity (see Shimwell et al. 2019), given the steep spectral index of identified ORCs. Deep X-ray observations may detect these energetic occasions as proven within the case of a big relic radio galaxy by Tamhane et al. (2015),” the paper reads.

Summing up the outcomes, the astronomers famous that ORC J0102–2450 with ASKAP makes it the third odd radio circle with an elliptical galaxy at its geometrical heart. They assume that it isn’t a coincidence and ORCs with such galaxies could also be widespread, what might assist us higher perceive formation mechanisms of those sources.

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Source:arxiv.org/abs/2104.13055

Astronomers discover a new extragalactic circular radio source

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