adplus-dvertising
Connect with us

Science

Australian Radio Telescope Spots Possible ‘Polar Ring’ Galaxy

Published

 on

The galaxy NGC 4632 and its apparent polar ring.
Image: Image Credit: Jayanne English (U. Manitoba), Nathan Deg (Queen’s U.) & WALLABY Survey, CSIRO/ASKAP, NAOJ/Subaru Telescope Science Credit: N. Deg and K. Spekkens (Queen’s U.) and WALLABY survey (CSIRO/ASKAP)

A radio telescope in Australia recently captured a stunning image of NGC 4632, a galaxy some 56 million light-years from Earth. The image reveals a halo of cool hydrogen orbiting perpendicular to the galaxy itself.

This ring—a “polar ring”—makes NGC 4632 a polar ring galaxy. The hydrogen gas encircling the galaxy is invisible to optical telescopes, but proved no problem for CSIRO’s ASKAP radio telescope, which sits on Wajarri Yamaji Country in Western Australia. The image above is a composite, produced from a combination of ASKAP data of the gaseous ring and optical data from the Subaru telescope in Hawaii.

The potential polar ring was identified as part of the WALLABY pilot survey’s first data release. The team’s research describing the findings were published today in the Monthly Notices of the Royal Astronomical Society.

The complete image of the galaxy and the polar ring detected by ASKAP.
The complete image of the galaxy and the polar ring detected by ASKAP.
Image: Image Credit: Jayanne English (U. Manitoba), Nathan Deg (Queen’s U.) & WALLABY Survey, CSIRO/ASKAP, NAOJ/Subaru Telescope Science Credit: N. Deg and K. Spekkens (Queen’s U.) and WALLABY survey (CSIRO/ASKAP)

“The findings suggest that one to three per cent of nearby galaxies may have gaseous polar rings, which is much higher than suggested by optical telescopes,” said Nathan Deg, an astronomer at Queen’s University in Canada and the study’s lead author, in a CSIRO release. “Polar ring galaxies might be more common than previously thought.”

Polar rings may come about in a couple of ways. One theory is that the rings form from material accreted to the galaxy by another galaxy passing nearby. The material is then shredded up, giving the blend of gas, dust, and stellar material its opaque, amorphous look. Another theory is that hydrogen gas travels along cosmic web filaments and ends up forming star-studded rings around nearby galaxies, in this case NGC 4632.

The WALLABY survey (short for the Widefield ASKAP L-band Legacy All-sky Blind surveY) aims to image the entirety of the southern sky and visualize the gas distribution across hundreds of thousands of galaxies. So far the team has detected two apparent polar ring galaxies—NGC 4632 and NGC 6156—out of 600 galaxies observed so far.

“Using ASKAP over coming years we expect to reveal more than 200,000 hydrogen-rich galaxies, among them many more unusual galaxies like these ones with polar rings,” said Bärbel Koribalski, an astronomer at CSIRO and co-author of the new research, in the same release.

Though the data suggested that two of the galaxies seen by WALLABY have polar rings, they “do not definitively prove” that fact, the researchers wrote. As the survey proceeds, the team will get data on more galaxies that will clarify the frequency of polar rings around galaxies, and could even shed light on the shape and distribution of dark matter in galaxies.

ASKAP is the precursor to the intercontinental Square Kilometer Array (SKA), which will study the universe’s Epoch of Reionization. Construction on the SKA began in December 2022, but don’t hold your breath; the array’s construction is expected to be completed in 2028, and nothing slips in astronomy like a timeline.

 

728x90x4

Source link

Continue Reading

Science

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

Published

 on

 

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.

Source link

Continue Reading

News

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

Published

 on

 

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.

Source link

Continue Reading

News

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

Published

 on

 

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.

The Canadian Press. All rights reserved.

Source link

Continue Reading

Trending