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Mysterious power burst seen in millimeter wavelength radio astronomy for first time

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August 3, 2022
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Mysterious power burst seen in millimeter wavelength radio astronomy for first time
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One of probably the most highly effective flashes within the sky, the results of a star and a neutron star colliding, has been noticed by millimeter wavelength radio astronomy for the primary time, providing an unprecedented view of one of the vital violent occasions within the Cosmos.

A analysis group led by Northwestern University in Illinois, and Radboud University within the Netherlands, used the Atacama Large Millimeter/submillimeter Array, or ALMA radio telescope in Chile to seize the afterglow of GRB 211106A, a brief gamma ray burst (GRB) decided to originate in a galaxy 20 billion gentle years away.

“This short gamma ray burst was the first time we tried to observe such an event with ALMA,” Northwestern professor of physics and astronomy Wen-fai Fong mentioned in a press release. “Afterglows for short bursts are very difficult to come by, so it was spectacular to catch this event shining so brightly.

Dr Fong is one of many authors on a study about the observation that will be published in an upcoming issue of Astrophysical Journal Letters, and is available online now on the academic preprint archive arxiv.org.

GRBs are powerful bursts of gamma radiation that occur when massive stars collapse into black holes, or dense neutron stars in a binary system merge with their companion stars to form a black hole, an intense cataclysmic event believed to forge most of the heavier elements in the universe such as gold and plutonium.

“These mergers occur because of gravitational wave radiation that removes energy from the orbit of the binary stars, causing the stars to spiral in toward each other,” Radboud University astronomer and lead writer of the paper Tanmoy Laskar mentioned in a press release. “The resulting explosion is accompanied by jets moving at close to the speed of light. When one of these jets is pointed at Earth, we observe a short pulse of gamma-ray radiation or a short-duration GRB.”

Short GRBs might solely final a fraction of a second, however their afterglow might persist in longer, much less energetic wavelengths of sunshine for minutes and even days.

Such was the case with GRB 211106A, the afterglow of which was first detected in X-ray gentle by NASA’s Neil Gehrels Swift Observatory, then present in infrared gentle by the Hubble Space Telescope, and most not too long ago in millimeter radio gentle by ALMA. It was solely with the addition of the ALMA remark that the GRB was pinpointed in a distant galaxy.

“The Hubble observations revealed an unchanging field of galaxies,” Dr Laskar mentioned in a press release. “ALMA’s unparalleled sensitivity allowed us to pinpoint the location of the GRB in that field with more precision, and it turned out to be in another faint galaxy, which is further away. That, in turn, means that this short-duration gamma-ray burst is even more powerful than we first thought, making it one of the most luminous and energetic on record.”

The Millimeter wavelength additionally offered scientists with a clearer image of the construction and density of the atmosphere across the GRB, in response to Dr Fong, and even allowed researchers to measure the obvious width of the jet that triggered the burst at simply greater than 15 levels, one of many widest ever measured.

The examine highlights the worth of observing complicated phenomena in a number of wavelengths utilizing probably the most subtle instruments out there, which now consists of the newly operational James Webb Space Telescope.

“In the future, we could also use JWST to capture infrared afterglows and study their chemical composition,” Dr Laskar mentioned in a press release. “I am excited about these upcoming discoveries in our field.”

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