Latest news with #ZitengWang
Yahoo
3 days ago
- General
- Yahoo
Scientists Are Stumped by Mysterious Pulsing 'Star'
ASKAP J1832 (in circle) captured by th Chandra X-Ray Observatory Credit - X-ray: NASA/CXC/ICRAR, Curtin Univ./Z. Wang et al.; Infrared: NASA/JPL/CalTech/IPAC; Radio: SARAO/MeerKAT; Image processing: NASA/CXC/SAO/N. Wolk Something strange is going on 15,000 light years from Earth. Out at that distant remove, somewhere in the constellation Scutum, an unexplained body is semaphoring into space, blinking in both X-ray and radio frequencies once every 44 minutes in a way never seen by astronomers before. The object could be a white dwarf—an Earth-sized husk that remains after a star has exhausted its nuclear fuel. Or not. It could also be a magnetar—a neutron star with an exceedingly powerful magnetic field. Unless it's not that either. 'Astronomers have looked at countless stars with all kinds of telescopes and we've never seen one that acts this way,' said astronomer Ziteng Wang of Curtin University in Australia, in a statement that accompanied the May 28 release of a paper in Nature describing the object, for which he was lead author. 'It's thrilling to see a new type of behavior for stars.' So what exactly is the mysterious body—which goes by the technical handle ASKAP J1832—and how common is this species of object? ASKAP J1832 is by no means unique in the universe in sending out energy in steady flashes. Pulsars—rapidly spinning neutron stars—do too. But pulsars flash much faster than ASKAP J1832 does, on the order of milliseconds to seconds. In 2022, astronomers discovered a type of object known as a long-period transient, which, like ASKAP J1832, sends out flashes of radio waves on the order of tens of minutes. So far 10 such bodies have been found, but none identical to ASKAP J1832, which is the first to emit X-rays too. What's more, ASKAP J1832's emissions have changed over time. During one observation with NASA's orbiting Chandra X-Ray Observatory in February 2024, the object was prodigiously producing both X-rays and radio waves. During a follow-up observation six months later, the radio waves were 1,000 times fainter and no X-rays were detected. That was a puzzle. 'We looked at several different possibilities involving neutron stars and white dwarfs, either in isolation or with companion stars,' said co-author Nanda Rea of the Institute of Space Sciences in Barcelona, Spain, in a statement. 'So far nothing exactly matches up, but some ideas work better than others.' One of those ideas is the magnetar, but that doesn't fit precisely, due to ASKAP J1832's bright and variable radio emissions. The white dwarf remains a possibility, however in order to produce the amount of energy it does, ASKAP J1832 would have to be orbiting another body in a formation known as a binary system, and so far that second body hasn't been detected. Viewed from Earth, ASKAP J1832 appears to be located in a supernova remnant, a cloud of hot gas and high energy particles that remains after an aging star meets its explosive end. But the authors of the paper concluded that the remnant merely lies in the foreground of the observational field with ASKAP J1832 in the background, the way an earthly cloud can drift in the path of the sun. So for now, the object remains a riddle—one that will be investigated further. 'Finding a mystery like this isn't frustrating,' said co-author Tong Bao of the Italian National Institute for Astrophysics, in a statement. 'It's what makes science exciting.' Write to Jeffrey Kluger at
Time Magazine
3 days ago
- Science
- Time Magazine
Scientists Are Stumped by Mysterious Pulsing ‘Star'
Something strange is going on 15,000 light years from Earth. Out at that distant remove, somewhere in the constellation Scutum, an unexplained body is semaphoring into space, blinking in both X-ray and radio frequencies once every 44 minutes in a way never seen by astronomers before. The object could be a white dwarf —an Earth-sized husk that remains after a star has exhausted its nuclear fuel. Or not. It could also be a magnetar —a neutron star with an exceedingly powerful magnetic field. Unless it's not that either. 'Astronomers have looked at countless stars with all kinds of telescopes and we've never seen one that acts this way,' said astronomer Ziteng Wang of Curtin University in Australia, in a statement that accompanied the May 28 release of a paper in Nature describing the object, for which he was lead author. 'It's thrilling to see a new type of behavior for stars.' So what exactly is the mysterious body—which goes by the technical handle ASKAP J1832—and how common is this species of object? ASKAP J1832 is by no means unique in the universe in sending out energy in steady flashes. Pulsars —rapidly spinning neutron stars—do too. But pulsars flash much faster than ASKAP J1832 does, on the order of milliseconds to seconds. In 2022, astronomers discovered a type of object known as a long-period transient, which, like ASKAP J1832, sends out flashes of radio waves on the order of tens of minutes. So far 10 such bodies have been found, but none identical to ASKAP J1832, which is the first to emit X-rays too. What's more, ASKAP J1832's emissions have changed over time. During one observation with NASA's orbiting Chandra X-Ray Observatory in February 2024, the object was prodigiously producing both X-rays and radio waves. During a follow-up observation six months later, the radio waves were 1,000 times fainter and no X-rays were detected. That was a puzzle. 'We looked at several different possibilities involving neutron stars and white dwarfs, either in isolation or with companion stars,' said co-author Nanda Rea of the Institute of Space Sciences in Barcelona, Spain, in a statement. 'So far nothing exactly matches up, but some ideas work better than others.' One of those ideas is the magnetar, but that doesn't fit precisely, due to ASKAP J1832's bright and variable radio emissions. The white dwarf remains a possibility, however in order to produce the amount of energy it does, ASKAP J1832 would have to be orbiting another body in a formation known as a binary system, and so far that second body hasn't been detected. Viewed from Earth, ASKAP J1832 appears to be located in a supernova remnant, a cloud of hot gas and high energy particles that remains after an aging star meets its explosive end. But the authors of the paper concluded that the remnant merely lies in the foreground of the observational field with ASKAP J1832 in the background, the way an earthly cloud can drift in the path of the sun. So for now, the object remains a riddle—one that will be investigated further. 'Finding a mystery like this isn't frustrating,' said co-author Tong Bao of the Italian National Institute for Astrophysics, in a statement. 'It's what makes science exciting.'
Malay Mail
3 days ago
- General
- Malay Mail
Astronomers discover mysterious star emitting rare combination of X-rays and radio waves
WASHINGTON, May 31 — Astronomers have spotted a star acting unlike any other ever observed as it unleashes a curious combination of radio waves and X-rays, pegging it as an exotic member of a class of celestial objects first identified only three years ago. It is located in the Milky Way galaxy about 15,000 light-years from Earth in the direction of the constellation Scutum, flashing every 44 minutes in both radio waves and X-ray emissions. A light-year is the distance light travels in a year, 5.9 trillion miles (9.5 trillion km). The researchers said it belongs to a class of objects called 'long-period radio transients,' known for bright bursts of radio waves that appear every few minutes to several hours. This is much longer than the rapid pulses in radio waves typically detected from pulsars - a type of speedily rotating neutron star, the dense collapsed core of a massive star after its death. Pulsars appear, as viewed from Earth, to be blinking on and off on timescales of milliseconds to seconds. 'What these objects are and how they generate their unusual signals remain a mystery,' said astronomer Ziteng Wang of Curtin University in Australia, lead author of the study published this week in the journal Nature. In the new study, the researchers used data from Nasa's orbiting Chandra X-ray Observatory, the ASKAP telescope in Australia and other telescopes. While the emission of radio waves from the newly identified object is similar to the approximately 10 other known examples of this class, it is the only one sending out X-rays, according to astrophysicist and study co-author Nanda Rea of the Institute of Space Sciences in Barcelona. The researchers have some hypotheses about the nature of this star. They said it may be a magnetar, a spinning neutron star with an extreme magnetic field, or perhaps a white dwarf, a highly compact stellar ember, with a close and quick orbit around a small companion star in what is called a binary system. 'However, neither of them could explain all observational features we saw,' Wang said. Stars with up to eight times the mass of our sun appear destined to end up as a white dwarf. They eventually burn up all the hydrogen they use as fuel. Gravity then causes them to collapse and blow off their outer layers in a 'red giant' stage, eventually leaving behind a compact core roughly the diameter of Earth — the white dwarf. The observed radio waves potentially could have been generated by the interaction between the white dwarf and the hypothesized companion star, the researchers said. 'The radio brightness of the object varies a lot. We saw no radio emission from the object before November 2023. And in February 2024, we saw it became extremely bright. 'Fewer than 30 objects in the sky have ever reached such brightness in radio waves. Remarkably, at the same time, we also detected X-ray pulses from the object. We can still detect it in radio, but much fainter,' Wang said. Wang said it is thrilling to see a new type of behavior for stars. 'The X-ray detection came from NASA's Chandra space telescope. That part was a lucky break. The telescope was actually pointing at something else, but just happened to catch the source during its 'crazy' bright phase. A coincidence like that is really, really rare - like finding a needle in a haystack,' Wang said. — Reuters
The Advertiser
3 days ago
- Science
- The Advertiser
Astronomers scrutinise a star behaving unlike any other
Astronomers have spotted a star acting unlike any other ever observed as it unleashes a curious combination of radio waves and X-rays. It is located in the Milky Way galaxy about 15,000 light-years from Earth in the direction of the constellation Scutum, flashing every 44 minutes in both radio waves and X-ray emissions. A light-year is the distance light travels in a year, 9.5 trillion kilometres. The researchers said it belongs to a class of objects called "long-period radio transients," known for bright bursts of radio waves that appear every few minutes to several hours. This is much longer than the rapid pulses in radio waves typically detected from pulsars - a type of speedily rotating neutron star, the dense collapsed core of a massive star after its death. Pulsars appear, as viewed from Earth, to be blinking on and off on timescales of milliseconds to seconds. "What these objects are and how they generate their unusual signals remain a mystery," said astronomer Ziteng Wang of Perth's Curtin University, lead author of the study published this week in the journal Nature. In the new study, the researchers used data from NASA's orbiting Chandra X-ray Observatory, the ASKAP telescope in Australia and other telescopes. While the emission of radio waves from the newly identified object is similar to the approximately 10 other known examples of this class, it is the only one sending out X-rays, according to astrophysicist and study co-author Nanda Rea of the Institute of Space Sciences in Barcelona. The researchers have some hypotheses about the nature of this star. They said it may be a magnetar, a spinning neutron star with an extreme magnetic field, or perhaps a white dwarf, a highly compact stellar ember, with a close and quick orbit around a small companion star in what is called a binary system. "However, neither of them could explain all observational features we saw," Wang said. Stars with up to eight times the mass of our sun appear destined to end up as a white dwarf. They eventually burn up all the hydrogen they use as fuel. Gravity then causes them to collapse and blow off their outer layers in a "red giant" stage, eventually leaving behind a compact core roughly the diameter of Earth - the white dwarf. The observed radio waves potentially could have been generated by the interaction between the white dwarf and the hypothesised companion star, the researchers said. "The radio brightness of the object varies a lot. We saw no radio emission from the object before November 2023. And in February 2024, we saw it became extremely bright. Fewer than 30 objects in the sky have ever reached such brightness in radio waves. Remarkably, at the same time, we also detected X-ray pulses from the object. We can still detect it in radio, but much fainter," Wang said. Wang said it is thrilling to see a new type of behaviour for stars. "The X-ray detection came from NASA's Chandra space telescope. That part was a lucky break. The telescope was actually pointing at something else, but just happened to catch the source during its crazy bright phase. A coincidence like that is really, really rare - like finding a needle in a haystack," Wang said. Astronomers have spotted a star acting unlike any other ever observed as it unleashes a curious combination of radio waves and X-rays. It is located in the Milky Way galaxy about 15,000 light-years from Earth in the direction of the constellation Scutum, flashing every 44 minutes in both radio waves and X-ray emissions. A light-year is the distance light travels in a year, 9.5 trillion kilometres. The researchers said it belongs to a class of objects called "long-period radio transients," known for bright bursts of radio waves that appear every few minutes to several hours. This is much longer than the rapid pulses in radio waves typically detected from pulsars - a type of speedily rotating neutron star, the dense collapsed core of a massive star after its death. Pulsars appear, as viewed from Earth, to be blinking on and off on timescales of milliseconds to seconds. "What these objects are and how they generate their unusual signals remain a mystery," said astronomer Ziteng Wang of Perth's Curtin University, lead author of the study published this week in the journal Nature. In the new study, the researchers used data from NASA's orbiting Chandra X-ray Observatory, the ASKAP telescope in Australia and other telescopes. While the emission of radio waves from the newly identified object is similar to the approximately 10 other known examples of this class, it is the only one sending out X-rays, according to astrophysicist and study co-author Nanda Rea of the Institute of Space Sciences in Barcelona. The researchers have some hypotheses about the nature of this star. They said it may be a magnetar, a spinning neutron star with an extreme magnetic field, or perhaps a white dwarf, a highly compact stellar ember, with a close and quick orbit around a small companion star in what is called a binary system. "However, neither of them could explain all observational features we saw," Wang said. Stars with up to eight times the mass of our sun appear destined to end up as a white dwarf. They eventually burn up all the hydrogen they use as fuel. Gravity then causes them to collapse and blow off their outer layers in a "red giant" stage, eventually leaving behind a compact core roughly the diameter of Earth - the white dwarf. The observed radio waves potentially could have been generated by the interaction between the white dwarf and the hypothesised companion star, the researchers said. "The radio brightness of the object varies a lot. We saw no radio emission from the object before November 2023. And in February 2024, we saw it became extremely bright. Fewer than 30 objects in the sky have ever reached such brightness in radio waves. Remarkably, at the same time, we also detected X-ray pulses from the object. We can still detect it in radio, but much fainter," Wang said. Wang said it is thrilling to see a new type of behaviour for stars. "The X-ray detection came from NASA's Chandra space telescope. That part was a lucky break. The telescope was actually pointing at something else, but just happened to catch the source during its crazy bright phase. A coincidence like that is really, really rare - like finding a needle in a haystack," Wang said. Astronomers have spotted a star acting unlike any other ever observed as it unleashes a curious combination of radio waves and X-rays. It is located in the Milky Way galaxy about 15,000 light-years from Earth in the direction of the constellation Scutum, flashing every 44 minutes in both radio waves and X-ray emissions. A light-year is the distance light travels in a year, 9.5 trillion kilometres. The researchers said it belongs to a class of objects called "long-period radio transients," known for bright bursts of radio waves that appear every few minutes to several hours. This is much longer than the rapid pulses in radio waves typically detected from pulsars - a type of speedily rotating neutron star, the dense collapsed core of a massive star after its death. Pulsars appear, as viewed from Earth, to be blinking on and off on timescales of milliseconds to seconds. "What these objects are and how they generate their unusual signals remain a mystery," said astronomer Ziteng Wang of Perth's Curtin University, lead author of the study published this week in the journal Nature. In the new study, the researchers used data from NASA's orbiting Chandra X-ray Observatory, the ASKAP telescope in Australia and other telescopes. While the emission of radio waves from the newly identified object is similar to the approximately 10 other known examples of this class, it is the only one sending out X-rays, according to astrophysicist and study co-author Nanda Rea of the Institute of Space Sciences in Barcelona. The researchers have some hypotheses about the nature of this star. They said it may be a magnetar, a spinning neutron star with an extreme magnetic field, or perhaps a white dwarf, a highly compact stellar ember, with a close and quick orbit around a small companion star in what is called a binary system. "However, neither of them could explain all observational features we saw," Wang said. Stars with up to eight times the mass of our sun appear destined to end up as a white dwarf. They eventually burn up all the hydrogen they use as fuel. Gravity then causes them to collapse and blow off their outer layers in a "red giant" stage, eventually leaving behind a compact core roughly the diameter of Earth - the white dwarf. The observed radio waves potentially could have been generated by the interaction between the white dwarf and the hypothesised companion star, the researchers said. "The radio brightness of the object varies a lot. We saw no radio emission from the object before November 2023. And in February 2024, we saw it became extremely bright. Fewer than 30 objects in the sky have ever reached such brightness in radio waves. Remarkably, at the same time, we also detected X-ray pulses from the object. We can still detect it in radio, but much fainter," Wang said. Wang said it is thrilling to see a new type of behaviour for stars. "The X-ray detection came from NASA's Chandra space telescope. That part was a lucky break. The telescope was actually pointing at something else, but just happened to catch the source during its crazy bright phase. A coincidence like that is really, really rare - like finding a needle in a haystack," Wang said. Astronomers have spotted a star acting unlike any other ever observed as it unleashes a curious combination of radio waves and X-rays. It is located in the Milky Way galaxy about 15,000 light-years from Earth in the direction of the constellation Scutum, flashing every 44 minutes in both radio waves and X-ray emissions. A light-year is the distance light travels in a year, 9.5 trillion kilometres. The researchers said it belongs to a class of objects called "long-period radio transients," known for bright bursts of radio waves that appear every few minutes to several hours. This is much longer than the rapid pulses in radio waves typically detected from pulsars - a type of speedily rotating neutron star, the dense collapsed core of a massive star after its death. Pulsars appear, as viewed from Earth, to be blinking on and off on timescales of milliseconds to seconds. "What these objects are and how they generate their unusual signals remain a mystery," said astronomer Ziteng Wang of Perth's Curtin University, lead author of the study published this week in the journal Nature. In the new study, the researchers used data from NASA's orbiting Chandra X-ray Observatory, the ASKAP telescope in Australia and other telescopes. While the emission of radio waves from the newly identified object is similar to the approximately 10 other known examples of this class, it is the only one sending out X-rays, according to astrophysicist and study co-author Nanda Rea of the Institute of Space Sciences in Barcelona. The researchers have some hypotheses about the nature of this star. They said it may be a magnetar, a spinning neutron star with an extreme magnetic field, or perhaps a white dwarf, a highly compact stellar ember, with a close and quick orbit around a small companion star in what is called a binary system. "However, neither of them could explain all observational features we saw," Wang said. Stars with up to eight times the mass of our sun appear destined to end up as a white dwarf. They eventually burn up all the hydrogen they use as fuel. Gravity then causes them to collapse and blow off their outer layers in a "red giant" stage, eventually leaving behind a compact core roughly the diameter of Earth - the white dwarf. The observed radio waves potentially could have been generated by the interaction between the white dwarf and the hypothesised companion star, the researchers said. "The radio brightness of the object varies a lot. We saw no radio emission from the object before November 2023. And in February 2024, we saw it became extremely bright. Fewer than 30 objects in the sky have ever reached such brightness in radio waves. Remarkably, at the same time, we also detected X-ray pulses from the object. We can still detect it in radio, but much fainter," Wang said. Wang said it is thrilling to see a new type of behaviour for stars. "The X-ray detection came from NASA's Chandra space telescope. That part was a lucky break. The telescope was actually pointing at something else, but just happened to catch the source during its crazy bright phase. A coincidence like that is really, really rare - like finding a needle in a haystack," Wang said.
Observer
3 days ago
- Science
- Observer
Astronomers scrutinise a star behaving unlike any other
WASHINGTON: Astronomers have spotted a star acting unlike any other ever observed as it unleashes a curious combination of radio waves and X-rays, pegging it as an exotic member of a class of celestial objects first identified only three years ago. It is located in the Milky Way galaxy about 15,000 light-years from Earth in the direction of the constellation Scutum, flashing every 44 minutes in both radio waves and X-ray emissions. A light-year is the distance light travels in a year, 5.9 trillion miles (9.5 trillion km). The researchers said it belongs to a class of objects called "long-period radio transients", known for bright bursts of radio waves that appear every few minutes to several hours. This is much longer than the rapid pulses in radio waves typically detected from pulsars - a type of speedily rotating neutron star, the dense collapsed core of a massive star after its death. Pulsars appear, as viewed from Earth, to be blinking on and off on timescales of milliseconds to seconds. "What these objects are and how they generate their unusual signals remain a mystery," said astronomer Ziteng Wang of Curtin University in Australia, lead author of the study published this week in the journal Nature. In the new study, the researchers used data from Nasa's orbiting Chandra X-ray Observatory, the ASKAP telescope in Australia and other telescopes. While the emission of radio waves from the newly identified object is similar to the approximately 10 other known examples of this class, it is the only one sending out X-rays, according to astrophysicist and study co-author Nanda Rea of the Institute of Space Sciences in Barcelona. The researchers have some hypotheses about the nature of this star. They said it may be a magnetar, a spinning neutron star with an extreme magnetic field, or perhaps a white dwarf, a highly compact stellar ember, with a close and quick orbit around a small companion star in what is called a binary system. "However, neither of them could explain all observational features we saw," Wang said. Stars with up to eight times the mass of our sun appear destined to end up as a white dwarf. They eventually burn up all the hydrogen they use as fuel. Gravity then causes them to collapse and blow off their outer layers in a "red giant" stage, eventually leaving behind a compact core roughly the diameter of Earth - the white dwarf. The observed radio waves potentially could have been generated by the interaction between the white dwarf and the hypothesised companion star, the researchers said. - Reuters
