Tag Archives: magnetar

A Runaway Magnetar Travels Across the Milky Way, Origin Point Unknown, According to Astronomers

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SGR 0501+4516 is the most likely candidate for Magnetaru’s Milky Way galaxy, which was not born from the supernova explosion, as originally predicted. The object may be very strange and may provide clues to the mechanism behind the fast radio bursts.

Impressions of Magneter artists. Image credit: ESA.

“A magnetor is a neutron star made up entirely of neutrons. What makes Magnetar unique is the extreme magnetic fields,” says Dr. Ashley Chris, an astronomer at the European Center for Space Research and Technology.

The strangeness of SGR 0501+4516 was identified with the help of ESA’s Gaia spacecraft with the help of a sensitive instrument mounted on the NASA/ESA Hubble Space Telescope.

Initially, Magnetar was discovered in 2008 when NASA’s Swift Observatory discovered a fierce flash of gamma rays from the outskirts of the Milky Way.

As magnetors are neutron stars, the natural explanation for their formation is that they are born in Supernova, where stars can explode and even collapse into ultra-density neutron stars.

This looked like the case of SGR 0501+4516, located near the supernova remnants called HB9.

The separation between the sky magnetor and the center of the supernova remnants is only 80 arcs, or slightly wider than the pinky finger, when seen at the edge of the extended arm.

However, a decade of research with Hubble questions Magnetall’s birthplace.

After the initial observation using ground-based telescopic tunables shortly after the discovery of SGR 0501+4516, astronomers used Hubble’s exquisite sensitivity and stable points to find the faint infrared glow of Magnetaral in 2010, 2012, and 2020.

Each of these images was arranged in a reference frame defined by observations from Gaia Spacecraft. GaiaSpacecraft has created a highly accurate 3D map of almost 2 billion stars in the Milky Way.

This method revealed subtle movements of magnets as they crossed the sky.

“All of this movement we measure is smaller than a pixel in a Hubble image,” said Dr. Joe Lyman, an astronomer at Warwick University.

“The ability to perform such measurements robustly is truly a testament to Hubble’s long-term stability.”

By tracking the magnetor’s location, astronomers were able to measure the apparent movement of the object across the sky.

Both the velocity and direction of movement of SGR 0501+4516 indicated that the magnetor was not associated with the remains of nearby supernova.

Tracking the magnetor’s trajectory thousands of years in the past showed that there were no other supernova remnants or large star clusters that it could be associated with.

If SGR 0501+4516 was not born on a supernova, the magnetors must be older than the estimated age of 20,000, or they may have been formed in a different way.

Magnetors can also be formed through a process called amalgamation or accretion-induced decay of two low-mass neutron stars.

Acceleration-induced decay requires a binary star system containing white dwarves.

When a white dwarf pulls gas from its companions, it grows too large to support itself, leading to an explosion, or perhaps a magnet.

“This scenario usually leads to a nuclear reaction ignition and a white d star explosion, leaving nothing behind,” said Dr Andrew Levan, an astronomer at Ladboo University and Warwick University.

“However, it is theorized that under certain conditions, white dwarfs may instead collapse into neutron stars. I think this is how SGR 0501+4516 was born.”

SGR 0501+4516 is currently the best candidate for galaxy magnetarals and may have been formed by a merger or an adductive decay.

The magnets formed through accretion-induced decays can provide some explanation for the mystical fast radio bursts, which are short but powerful flashes of radio waves.

In particular, this scenario may explain the origins of fast radio bursts that emerge from a group of stars that are too old to recently create a huge star to explode as a supernove.

“The magnetor’s fertility and formation scenarios are one of the most pressing issues of high-energy astrophysics, affecting many of the most powerful temporary events in the universe, including gamma-ray bursts, superilluminating supernovas and fast radio bursts.”

Survey results It will be displayed in the journal Astronomy and Astrophysics.

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aa chrime et al. 2025. Magnetor SGR 0501+4516 infrared support and proper movement. A&A 696, A127; doi: 10.1051/0004-6361/202453479

Source: www.sci.news

Astronomers observe massive flare emitted by Messier 82 magnetar

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Using sensitive instruments aboard ESA’s International Gamma-ray Astrophysics Laboratory (Integral) mission, astronomers GRB231115A Taken from the center of Messier 82 (M82, NGC 3034, or the Cigar Galaxy). Messier 82 (M82, NGC 3034, or Cigar Galaxy) is a starburst irregular galaxy located 12 million light-years away in the constellation Ursa Major. They say the spectral and timing characteristics of GRB 231115A, as well as the lack of X-ray and optical observations and gravitational wave signals several hours after the event, indicate that this outburst was the result of a giant flare from a magnetar. Suggests. They conclude that starburst galaxies like Messier 82, which are known to produce magnetars, could be promising targets for studying giant flares.

On November 15, 2023, Integral detected a burst of gamma rays that lasted just one-tenth of a second. The detection was sent to the Integral Science Data Center, where software determined it came from the nearby galaxy Messier 82. A small square on Integral's map indicates the location of the burst. Blue circles on the two cropped images indicate corresponding locations. Image credit: ESA / Integral / XMM-Newton / INAF / TNG / M. Rigoselli, INAF.

Giant flares are short explosive events that release very large amounts of energy as gamma-ray bursts (GRBs).

Only three such flares have been observed from magnetars in our Milky Way galaxy and the nearby Large Magellanic Cloud in the past roughly 50 years.

Observations of giant flares from distant magnetars are hampered by the fact that at long distances it is difficult to identify the source of the energy burst.

“Some young neutron stars have very strong magnetic fields, more than 10,000 times stronger than a typical neutron star. These are called magnetars. They emit energy as flares, and sometimes these flares can be huge,” said ESA astronomer Dr. Ashley Climes.

“However, in the past 50 years of gamma-ray observations, huge flares from our galaxy's magnetars have only been observed three times.”

“These explosions are extremely powerful. The explosion detected in December 2004 came from 30,000 light-years away from us, but was still powerful enough to affect the upper layers of Earth's atmosphere. It's like a solar flare coming from much closer to us.

“The flare detected by Integral is the first confirmation of the existence of a magnetar outside the Milky Way,” said Dr. Sandro Meleghetti, an astronomer at the National Institute of Astrophysics.

“We suspect that some of the other 'short gamma-ray bursts' revealed by Integral and other satellites are also giant flares from magnetars.”

“This discovery will begin the search for other extragalactic magnetars. If we can find more stars, we will be able to understand how often these flares occur and how the stars lose energy in the process. We can begin to understand that,” Dr. Cromes said.

“However, such short-lived explosions can only be caught by chance if the observatory is already pointing in the right direction,” said Dr. Jan-Uwe Ness, a scientist at the Integral project.

“This makes Integral, with its wide field of view more than 3,000 times the area of ​​the sky covered by the Moon, extremely important for these detections.”

“Messier 82 is a bright galaxy in which star formation occurs,” the authors said.

“In these regions, massive stars are born, live short, turbulent lives, and leave behind neutron stars.”

“The discovery of magnetars in this region confirms that magnetars are likely young neutron stars.”

“The search for additional magnetars will continue in other star-forming regions to understand these extraordinary objects.”

of findings It was published in the magazine Nature.

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S. Meleghetti other. A giant magnetar flare in the nearby starburst galaxy M82. Nature, published online March 7, 2024. doi: 10.1038/s41586-024-07285-4

Source: www.sci.news