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NASA’s Chandra X-ray telescope sees ‘knots’ blasting from close by black gap jets

November 6, 2024
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NASA’s Chandra X-ray telescope sees ‘knots’ blasting from close by black gap jets
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Astronomers have scoured decades-old knowledge from NASA’s Chandra X-ray Observatory, discovering brilliant, lumpy options dotting a jet of power spit out by a close-by black gap. Puzzlingly, the “knots” clock a sooner velocity when seen in X-rays than they do in radio wavelengths. scientists mentioned.

“The X-ray knowledge traces a novel image which you could’t see in another wavelength,” research lead creator David Bogensberger, an astrophysicist on the College of Michigan, who led the brand new research, mentioned in a latest news release. “We have proven a brand new method to finding out jets and I feel there’s a variety of attention-grabbing work to be accomplished.”

The research, which was printed Oct. 18 in The Astrophysical Journal, comes as NASA delays its last choice about funds cuts that might decide the destiny of the observatory (which faces untimely cancellation after its funds was slashed because of the company’s monetary restrictions) and of the X-ray group that depends on it for analysis. NASA continues to function on 2024 ranges regardless of a brand new fiscal yr having kicked in Oct. 1, partly on account of its 2025 funds being depending on the end result of the presidential election and modifications in social gathering within the Home and Senate, SpaceNews reported.

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In the meantime, astronomers proceed to emphasize the science worth being delivered by the X-ray telescope, which turned 25 years outdated in July.

Within the new research, Bogensberger and his staff analyzed twenty years of Chandra’s observations of the lively supermassive black gap lurking on the coronary heart of Centaurus A galaxy, a considerably misshapen elliptical swirl of gasoline and dirt roughly 12 million light-years from Earth. No less than one of many newfound “jet knots” seems to be touring at 94% the velocity of sunshine, which was increased than the 80% of sunshine’s velocity clocked in radio observations, based on the paper.

Associated: Astronomers spot unusually synchronized star formation’ in historical galaxy for 1st time

“What this implies is that radio and X-ray jet knots transfer in another way,” Bogensberger mentioned within the assertion. “There’s quite a bit we nonetheless do not actually find out about how jets work within the X-ray band.”

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The Centaurus A galaxy was found as early because the mid-1800s, but it surely wasn’t till a century later that its twin jets got here into view of then-new radio telescopes. One of many jet’s northeastern aspect factors towards Earth, whereas the opposite, known as the counterjet, faces southwest and is considerably fainter, based on the research.

Astronomers know that black gap jets are fueled by materials swept up by the cosmic behemoths and expelled earlier than it may possibly attain the occasion horizon, which is the boundary round black holes that traps all the things, together with mild, for eternity. Nonetheless, exactly how the fabric is funneled to the jet is poorly understood; prevailing principle suggests highly effective, messy magnetic fields across the black gap and the behemoth’s spin itself could also be necessary contributors.

Along with how the noticed knots could have shaped, researchers are additionally puzzled over their altering brightness. In the course of the twenty years, from 2002 to 2022, a knot turned brighter whereas one other light. Again in 2009 astronomers noticed the identical pattern in jet knots blasted by a monster black gap within the heart of M87 galaxy, which resides roughly 55 million light-years from Earth within the constellation Virgo. For causes unknown, these knots brightened over a number of years to the purpose that they outshined even the galaxy’s brilliant core earlier than fading into the darkness of area.

Forthcoming investigations into the jets of Centaurus A and different galaxies might reveal whether or not the knot’s different speeds and brightness is an intrinsic habits of the jet because it blasts away from the black gap, or an exterior impediment, reminiscent of interstellar materials.

“A key to understanding what is going on on within the jet might be understanding how totally different wavelength bands hint totally different components of the surroundings,” Bogensberger mentioned within the assertion. “Now we’ve that risk.”



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