Supermassive “bubbles” in space might have been created by a single event originating at the black hole near the center of our galaxy, a Taiwanese researcher said on Thursday.
The successful simulation of a theoretical model lent credence to the hypothesis that Fermi “bubbles,” as well as the microwave haze, were the result of a single jet event from the central black hole, said Karen Yang (揚湘怡), an associate professor in National Tsing Hua University’s Institute of Astronomy.
The theoretical model would extend understanding of activity at the center of the Milky Way and the correlation of supermassive black hole and galaxy co-evolution in the context of galaxy formation, said the abstract of a paper titled “Fermi and eROSITA bubbles as relics of the past activity of the Galaxy’s central black hole,” which was published in the journal Nature Astronomy this month.
Photo courtesy of National Tsing Hua University
University of Michigan Department of Astronomy associate professor Mateusz Ruszkowski and University of Wisconsin-Madison professor Ellen Zweibel were the coauthors.
The origin of the bubbles and the microwave haze has been intensely debated since their discovery, Yang said.
As the bubbles and the haze have “symmetry about the galactic center,” the team hypothesized that they originated from energetic outbursts, she said.
The central black hole has absorbed 10,000 to 100,000 times the mass of our sun, but only some of that mass has passed the event horizon — the “point of no return” — with most of it spat out at nearly the speed of light, Yang said.
Using a numerical simulation, the team demonstrated how the model can reproduce a process to create the bubbles and haze, the study said.
“It allows us to derive critical constraints on the energetics and timescales of the outburst,” the paper said.
The study demonstrates how supermassive black holes evolve and the co-evolution of such features in other galaxies, Ruszkowski said, adding that perhaps researchers might one day answer how such “bubbles” affect galactic evolution.
The eROSITA X-ray instrument, which was built by the Max Planck Institute for Extraterrestrial Physics in Germany, is part of the Russian-German Spektr-RG space observatory.
The Fermi bubbles were previously discovered by the Fermi Gamma-ray Space Telescope.
GREATER NUMBER: The sorties might have been a response to the US and the EU expressing concern on Friday over China’s ‘provocations’ in the Taiwan Strait Twenty-five Chinese military aircraft and four naval ships were detected around Taiwan from 6am Saturday to 6am yesterday, including eight airplanes that had crossed the median line of the Taiwan Strait and another two that entered Taiwan’s air defense identification zone (ADIZ). The People’s Liberation Army (PLA) aircraft that entered Taiwan’s southwestern ADIZ were a Y-8 anti-submarine plane and a BZK-005 uncrewed aerial vehicle, the Ministry of National Defense said. The aircraft that flew across the median line include two Sukhoi Su-30 fighter jets, four J-16 multipurpose fighters and two J-10 jets, the ministry’s official Web site showed. Taiwan’s armed forces monitored the
Mask easing: Teachers are allowed to take their masks off while lecturing indoors, but students should keep theirs on, as COVID-19 measures ease this week The Ministry of Education (MOE) yesterday released new on-campus COVID-19 prevention guidelines, stating that masks can be taken off while exercising, singing, dancing, performing, taking photographs, dining, drinking, video and voice recording, hosting events, presenting speeches and lecturing outdoors. Large outdoor events organized by schools should comply with the mask regulations issued by the Central Epidemic Command Center (CECC), it added. The new guidelines came into effect yesterday, and people in Taiwan are no longer required to wear masks outdoors for the first time since May 19 last year. The CECC announced the easing of the mask mandate on Monday, adding that it
LUNAR NEW YEAR PEAK: Taiwanese who are in China should get vaccinated and consider returning early, as infection rates are expected to increase, the CECC said China faces five major problems once COVID-19 begins spreading there, with a peak in infections likely during the Lunar New Year holidays, Deputy Minister of Health and Welfare Victor Wang (王必勝), who heads the Central Epidemic Command Center (CECC), said yesterday. Wang wrote on Facebook that according to the center’s data, the increasing number of COVID-19 cases in China is worth noting, as the new Omicron subvariants BF.7 and BA.5.2 spreading in China are highly infectious and are more transmissible than the previously dominating Omicron subvariants. “The virus cannot be eliminated even under China’s strict control measures,” he wrote. “Its policy
‘SEXUAL ASSAULT’: Taipei prosecutors said that cooperation agreements between Taiwan and the Czech Republic grant Czech officials protection against prosecution The Taipei District Prosecutors’ Office yesterday reaffirmed that it would not charge a Czech official with sexual assault because he is protected by diplomatic immunity. The office released a statement saying it has verified that the man works for the Czech Economic and Cultural Office Taipei’s foreign affairs corps and is thereby protected from criminal prosecution. A foreign graduate student in Taiwan had filed a complaint alleging that the section head of the Czech Economic and Trade Section had sexually assaulted her on April 21 last year. The woman said the Czech official had invited her to his home and then forced her