Mysterious circular objects spotted orbiting Milky Way's supermassive black hole, see pics

Astromers have discovered four new and mysterious objects at radio wavelengths, circular and so much brighter on edge, unlike any class of astromical object orbiting Milky Way's supermassive black hole, Sagittarius A*. In a new paper published in journal Nature Astromy,  Australian Square Kilometre Array Pathfinder detected strange dust-shrouded objects looking like a ring, a bubble, or an island in deep  which scientists termed as ORCs - short for "Odd Radio Circles".  

Compact like stars as y run laps around our galaxy's gargantuan black hole,  international team of astromers led by astrophysicist Ray rris of Western Sydney University in Australia discovered objects and released information in arXiv research paper. "Circular features are well-kwn in radio astromical ims, and usually represent a spherical object such as a superva remnant, a planetary nebula, a circumstellar shell, or a face-on disc such as a protoplanetary disc or a star-forming galaxy," wrote researchers. mysterious ORCs were first spotted in data collected during  late 2019 Pilot Survey of  Evolutionary Map of Universe (EMU) conducted using one of world's most sensitive radio telescope arrays.  

While inspecting collective ims, scientists discovered strange circles that y suspected at first could be a glitch. However, when fourth ORC was discovered by researchers in archival data, collected in 2013 with Giant MetreWave Radio Telescope, object was revealed. Furr, a follow-up observation of ORC 1 and ORC 2 using a different telescope was done which confirmed  four ORCs are at high galactic latitudes. Around 1 arcminute in diameter, scientists studied ims on Australia Telescope Compact Array furr ting that objects sat at some distance from galactic plane. Furr, it was found that objects were invisible in X-ray, optical, or infrared wavelengths and were strangely only detectable in radio wavelengths.  

re could also be more than one cause of ORCs. It really is an intriguing mystery, scientists wrote in research arXiv.

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Transients taken place in "distant past"

In paper, researchers concluded that whatever was causing ORCs was likely outside Milky Way galaxy. y ted that objects could be a result of some spherical shockwave from a massive galactical event. Scientists explained, “Several such classes of transient events, capable of producing a spherical shock wave, have recently been discovered, such as fast radio bursts, gamma-ray bursts, and neutron star mergers. However, because of large angular size of ORCs, any such transients would have taken place in distant past.” While scientists ted that  ORCs could represent a new category of a kwn phemen, such as jets of a radio galaxy or blazar, it was also possible that objects were some remnant of a previous outflow from a radio galaxy.

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(All Ims Credit: UCLA/NASA)