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Enigmatic fast radio burst pinned on magnetised dead star – Yahoo News

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The Chime telescope observes the sky in Canada’s British Columbia province

At last, we’re making headway in deciphering some of the Universe’s most enigmatic signals.

Scientists have managed to trace a very short, very bright burst of radio waves to a type of highly magnetised dead star, known as a magnetar.

It’s the first time a so-called fast radio burst, or FRB, has been pinned on a specific source.

FRBs were first detected in 2007, and have been one of the hottest topics in astronomy ever since.

The new discovery, reported in the journal Nature, was made by two independent radio telescope arrays in North America.

Co-incident observations by other astronomical facilities – both in space and on the ground – helped characterise the event and strengthen the interpretation.

The source magnetar, a known object, has the slightly unwieldy designation of SGR 1935+2154.

It’s about 30,000 light-years away, which is interesting because all previous FRB detections have come from beyond our Milky Way galaxy.

The detected properties, however, are very much the same.

Luminous event

The event itself occurred on 28 April this year. It lasted around a millisecond but was extremely luminous.

“We were able to determine that the energy dispersed is comparable to the energies of extra-galactic fast radio bursts, and in about one millisecond, this magnetar emitted as much energy in radio waves as [our] Sun does in 30 seconds,” explained Christopher Bochenek, who led the design and construction of the Stare2 radio receiver network which is spread across California and Utah.

Even as far back 2007, magnetars were a prime suspect for the origin of FRBs.

Magnetars are a form of neutron star – strange, compact objects in which matter has been compressed into a very small volume. It’s a state some normal stars can be reduced to when they run out of fuel and collapse in on themselves.

Magnetars, as the name might suggest, have intense magnetic fields – trillions of times more intense than Earth’s field, for example.

Theory suggests these objects can flare enormous amounts of energy that then shocks their surroundings, which in turn drives great emissions at radio and other wavelengths. This is one idea, but there are many other models that have been proposed.

Other sources

“Given the source distance, this is the most luminous radio burst ever detected in our own galaxy,” said Daniele Michilli from the team operating the Chime telescope in British Columbia.

“The luminosity is still lower than that of fast radio bursts (coming from outside our Milky Way), but it demonstrates that magnetars can release a huge amount of radio energy with properties like those of FRBs, implying that at least [some] FRBs are probably coming from magnetars.”

Bing Zhang, who works on China’s new giant radio telescope, the 500m-wide Fast observatory, also sometimes called Tianyan, said other possible sources for FRBs were being investigated.

These include colliding giant stars, and neutron stars that experience further collapse to become a black hole – a so-called blitzar event.

Such phenomena might explain the class of bursts that appear to be one-off events.

“But so far, we don’t have any support for those scenarios yet,” he told reporters. “If they exist, they must be very, very rare. Only a very small fraction of FRBs are allowed to be catastrophic.”

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The body of a Ugandan Olympic athlete who was set on fire by her partner is received by family

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NAIROBI, Kenya (AP) — The body of Ugandan Olympic athlete Rebecca Cheptegei — who died after being set on fire by her partner in Kenya — was received Friday by family and anti-femicide crusaders, ahead of her burial a day later.

Cheptegei’s family met with dozens of activists Friday who had marched to the Moi Teaching and Referral Hospital’s morgue in the western city of Eldoret while chanting anti-femicide slogans.

She is the fourth female athlete to have been killed by her partner in Kenya in yet another case of gender-based violence in recent years.

Viola Cheptoo, the founder of Tirop Angels – an organization that was formed in honor of athlete Agnes Tirop, who was stabbed to death in 2021, said stakeholders need to ensure this is the last death of an athlete due to gender-based violence.

“We are here to say that enough is enough, we are tired of burying our sisters due to GBV,” she said.

It was a somber mood at the morgue as athletes and family members viewed Cheptegei’s body which sustained 80% of burns after she was doused with gasoline by her partner Dickson Ndiema. Ndiema sustained 30% burns on his body and later succumbed.

Ndiema and Cheptegei were said to have quarreled over a piece of land that the athlete bought in Kenya, according to a report filed by the local chief.

Cheptegei competed in the women’s marathon at the Paris Olympics less than a month before the attack. She finished in 44th place.

Cheptegei’s father, Joseph, said that the body will make a brief stop at their home in the Endebess area before proceeding to Bukwo in eastern Uganda for a night vigil and burial on Saturday.

“We are in the final part of giving my daughter the last respect,” a visibly distraught Joseph said.

He told reporters last week that Ndiema was stalking and threatening Cheptegei and the family had informed police.

Kenya’s high rates of violence against women have prompted marches by ordinary citizens in towns and cities this year.

Four in 10 women or an estimated 41% of dating or married Kenyan women have experienced physical or sexual violence perpetrated by their current or most recent partner, according to the Kenya Demographic and Health Survey 2022.

The Canadian Press. All rights reserved.

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The ancient jar smashed by a 4-year-old is back on display at an Israeli museum after repair

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TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.

Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.

Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.

The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.

The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.

It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.

Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.

Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.

Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.

Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.

Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.

The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”

The Canadian Press. All rights reserved.

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B.C. sets up a panel on bear deaths, will review conservation officer training

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VICTORIA – The British Columbia government is partnering with a bear welfare group to reduce the number of bears being euthanized in the province.

Nicholas Scapillati, executive director of Grizzly Bear Foundation, said Monday that it comes after months-long discussions with the province on how to protect bears, with the goal to give the animals a “better and second chance at life in the wild.”

Scapillati said what’s exciting about the project is that the government is open to working with outside experts and the public.

“So, they’ll be working through Indigenous knowledge and scientific understanding, bringing in the latest techniques and training expertise from leading experts,” he said in an interview.

B.C. government data show conservation officers destroyed 603 black bears and 23 grizzly bears in 2023, while 154 black bears were killed by officers in the first six months of this year.

Scapillati said the group will publish a report with recommendations by next spring, while an independent oversight committee will be set up to review all bear encounters with conservation officers to provide advice to the government.

Environment Minister George Heyman said in a statement that they are looking for new ways to ensure conservation officers “have the trust of the communities they serve,” and the panel will make recommendations to enhance officer training and improve policies.

Lesley Fox, with the wildlife protection group The Fur-Bearers, said they’ve been calling for such a committee for decades.

“This move demonstrates the government is listening,” said Fox. “I suspect, because of the impending election, their listening skills are potentially a little sharper than they normally are.”

Fox said the partnership came from “a place of long frustration” as provincial conservation officers kill more than 500 black bears every year on average, and the public is “no longer tolerating this kind of approach.”

“I think that the conservation officer service and the B.C. government are aware they need to change, and certainly the public has been asking for it,” said Fox.

Fox said there’s a lot of optimism about the new partnership, but, as with any government, there will likely be a lot of red tape to get through.

“I think speed is going to be important, whether or not the committee has the ability to make change and make change relatively quickly without having to study an issue to death, ” said Fox.

This report by The Canadian Press was first published Sept. 9, 2024.

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