Modi govt pursuing bold strategies for universal Internet access by 2022: Ajit Pai

Washington D.C., Feb 6: An international team of astronomers has found an unusual monster galaxy that existed about 12 billion years ago when the universe was only 1.8 billion years old.

The team of astronomers was led by scientists at the University of California, Riverside.

Dubbed XMM-2599, the galaxy formed stars at a high rate and then died. Why it suddenly stopped forming stars is unclear.

"Even before the universe was 2 billion years old, XMM-2599 had already formed a mass of more than 300 billion suns, making it an ultra massive galaxy," said Benjamin Forrest, a postdoctoral researcher in the UC Riverside Department of Physics and Astronomy and the study's lead author.

"More remarkably, we show that XMM-2599 formed most of its stars in a huge frenzy when the universe was less than 1 billion years old and then became inactive by the time the universe was only 1.8 billion years old," Forrest added.

The team used spectroscopic observations from the W. M. Keck Observatory's powerful Multi-Object Spectrograph for Infrared Exploration or MOSFIRE, to make detailed measurements of XMM-2599 and precisely quantify its distance.

The study results appear in the Astrophysical Journal.

"In this epoch, very few galaxies have stopped forming stars, and none are as massive as XMM-2599," said Gillian Wilson, a professor of physics and astronomy at UCR in whose lab Forrest works.

"The mere existence of ultramassive galaxies like XMM-2599 proves quite a challenge to numerical models. Even though such massive galaxies are incredibly rare at this epoch, the models do predict them."

"The predicted galaxies, however, are expected to be actively forming stars. What makes XMM-2599 so interesting, unusual, and surprising is that it is no longer forming stars, perhaps because it stopped getting fuel or its black hole began to turn on. Our results call for changes in how models turn off star formation in early galaxies," the professor stated.

The research team found XMM-2599 formed more than 1,000 solar masses a year in stars at its peak of activity -- an extremely high rate of star formation. In contrast, the Milky Way forms about one new star a year.

"XMM-2599 may be a descendant of a population of highly star-forming dusty galaxies in the very early universe that new infrared telescopes have recently discovered," said Danilo Marchesini, an associate professor of astronomy at Tufts University and a co-author on the study.

"We have caught XMM-2599 in its inactive phase," Wilson said, who led the W. M. Keck Observatory data acquisition
Co-author Michael Cooper, a professor of astronomy at UC Irvine, said this outcome is a strong possibility.

"Perhaps during the following 11.7 billion years of cosmic history, XMM-2599 will become the central member of one of the brightest and most massive clusters of galaxies in the local universe," he said.

"Alternatively, it could continue to exist in isolation. Or we could have a scenario that lies between these two outcomes," he stated.

The study was supported by grants from the National Science Foundation and NASA.

Mar 4: Twenty-one Italian tourists and three Indian tour operators have been sent to an ITBP quarantine facility in Delhi on Tuesday for suspected coronavirus exposure, official sources said.

Health Ministry sources said these foreigners, 13 women and eight men, were in the same group of which an Italian and his wife have tested positive in Rajasthan capital Jaipur.

“His (Italian in Jaipur) condition is stable,” a source said.

Three Indians, who were accompanying this Italian group as tour operators, have also been sent to the ITBP facility in Chhawla area of south-west Delhi, they said.

All these people, staying at a five-star hotel in south Delhi, have been put in “preventive isolation” at the ITBP camp and their samples will be taken on Wednesday, sources said.

The centre already has 112 people, 76 Indians and 36 foreigners, since February 27 after they were evacuated by an IAF plane from Wuhan in China, the epicentre of the coronavirus.

The first samples of these 112 people had tested negative when reports came in last week.

Kanpur, Jul 10: Kanpur encounter main accused Vikas Dubey, who was injured in an encounter with the police, died on Friday, the police said.

"Gangster Vikas Dubey arrested for killing eight policemen is dead," confirmed the police.

According to SP Kanpur West Anil Kumar, gangster Vikas Dubey attempted to flee after the car overturned. Dubey attempted to flee by snatching pistol of the injured policemen. However, he was shot in the retaliatory firing.

"Vikas Dubey attempted to flee by snatching pistol of the injured policemen after the car overturned. Police tried to make him surrender, during which he fired at the policemen. He was injured in retaliatory firing by police. He was later rushed to the hospital," SP Kanpur West told reporters here.

Dubey, the main accused in the Kanpur encounter was arrested by the police in Ujjain on Thursday morning. He was on the run for the last six days and had come to Ujjain to offer prayers at Temple, where he was identified by a security guard at the shrine.

The gangster is the main accused in the encounter that took place in Bikru village in Chaubeypur area of Kanpur last week, in which a group of assailants allegedly opened fire on a police team, which had gone to arrest Dubey. Eight police personnel were killed in the encounter.

Dubey managed to escape after the killing.  The Uttar Pradesh police launched a hunt for him and raised the bounty on him to Rs 5 lakh.

Bahua Dubey and Prabhat Mishra, close aides of the main accused, were killed in separate encounters in Etawah and Kanpur respectively, on Thursday.

The main accused's other aide Shyamu Bajpai was arrested by the Chaubeypur police following an encounter. He carried a reward of Rs 25,000, the police informed on Wednesday. Earlier the same day, Uttar Pradesh's Special Task Force (STF) gunned down Vikas Dubey's close aide Amar Dubey in Hamirpur district.