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A galactic merger brought a pair of supermassive black holes together | CNN

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A galactic merger brought a pair of supermassive black holes together | CNN

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Two supermassive black holes have been noticed feasting on cosmic supplies as two galaxies in distant house merge — and are the closest to colliding black holes astronomers have ever noticed.

Astronomers noticed the pair whereas utilizing the Atacama Giant Millimeter/Submillimeter Array of telescopes, or ALMA, in northern Chile’s Atacama Desert, to look at two merging galaxies about 500 million light-years from Earth.

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The 2 black holes have been rising in tandem close to the middle of the coalescing galaxy ensuing from the merger. They met when their host galaxies, often called UGC 4211, collided.

One is 200 million instances the mass of our solar, whereas the opposite is 125 million instances the mass of our solar.

Whereas the black holes themselves aren’t immediately seen, each have been surrounded by shiny clusters of stars and heat, glowing gasoline — all of which is being tugged by the holes’ gravitational pull.

Over time, they are going to begin circling each other in orbit, finally crashing into each other and creating one black gap.

After observing them throughout a number of wavelengths of sunshine, the black holes are situated the closest collectively scientists have ever seen — solely about 750 light-years aside, which is comparatively shut, astronomically talking.

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The outcomes have been shared on the 241st assembly of the American Astronomical Society being held this week in Seattle, and revealed Monday in The Astrophysical Journal Letters.

The gap between the black holes “is pretty near the restrict of what we are able to detect, which is why that is so thrilling,” mentioned examine coauthor Chiara Mingarelli, an affiliate analysis scientist on the Flatiron Institute’s Middle for Computational Astrophysics in New York Metropolis, in an announcement.

Galactic mergers are extra widespread within the distant universe, which makes them tougher to see utilizing Earth-based telescopes. However ALMA’s sensitivity was in a position to observe even their energetic galactic nuclei — the brilliant, compact areas in galaxies the place matter swirls round black holes. Astronomers have been stunned to discover a binary pair of black holes, relatively than a single black gap, eating on the gasoline and mud stirred up by the galactic merger.

“Our examine has recognized one of many closest pairs of black holes in a galaxy merger, and since we all know that galaxy mergers are far more widespread within the distant Universe, these black gap binaries too could also be far more widespread than beforehand thought,” mentioned lead examine writer Michael Koss, a senior analysis scientist on the Eureka Scientific analysis institute in Oakland, California, in an announcement.

“What we’ve simply studied is a supply within the very closing stage of collision, so what we’re seeing presages that merger and likewise offers us perception into the connection between black holes merging and rising and finally producing gravitational waves,” Koss mentioned.

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If pairs of black holes — in addition to merging galaxies that result in their creation — are extra widespread within the universe than beforehand thought, they might have implications for future gravitational wave analysis. Gravitational waves, or ripples in house time, are created when black holes collide.

It would nonetheless take just a few hundred million years for this specific pair of black holes to collide, however the insights gained from this remark might assist scientists higher estimate what number of pairs of black holes are near colliding within the universe.

“​​There is likely to be many pairs of rising supermassive black holes within the facilities of galaxies that we now have not been in a position to establish thus far,” mentioned examine coauthor Ezequiel Treister, an astronomer at Universidad Católica de Chile in Santiago, Chile, in an announcement. “If that is so, within the close to future we can be observing frequent gravitational wave occasions brought on by the mergers of those objects throughout the Universe.”

House-based telescopes like Hubble and the Chandra X-ray Observatory and ground-based telescopes just like the European Southern Observatory’s Very Giant Telescope, additionally within the Atacama Desert, and the W.M. Keck telescope in Hawaii have additionally noticed UGC 4211 throughout completely different wavelengths of sunshine to supply a extra detailed overview and differentiate between the 2 black holes.

“Every wavelength tells a unique a part of the story,” Treister mentioned. “All of those information collectively have given us a clearer image of how galaxies akin to our personal turned out to be the best way they’re, and what they are going to grow to be sooner or later.”

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Understanding extra concerning the finish phases of galaxy mergers might present extra perception about what’s going to occur when our Milky Manner galaxy collides with the Andromeda galaxy in about 4.5 billion years.

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Federal Reserve should cut US interest rates ‘gradually’, says top official

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Federal Reserve should cut US interest rates ‘gradually’, says top official

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A top Federal Reserve official said the US central bank should revert to cutting interest rates “gradually”, after a larger than usual half-point reduction earlier this month.

St Louis Fed president Alberto Musalem said the US economy could react “very vigorously” to looser financial conditions, stoking demand and prolonging the central bank’s mission to beat inflation back to 2 per cent.

“For me, it’s about easing off the brake at this stage. It’s about making policy gradually less restrictive,” Musalem told the Financial Times on Friday. He was among officials to pencil in more than one quarter-point cut for the remainder of the year, according to projections released at this month’s meeting.

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The comments from Musalem, who became the St Louis Fed’s president in April and will be a voting member on the Federal Open Market Committee next year, came less than two weeks after the Fed lopped half a percentage point from rates, forgoing a more traditional quarter-point cut to kick off its first easing cycle since the onset of Covid-19 in early 2020.

The jumbo cut left benchmark rates at 4.75 per cent to 5 per cent — a move that Fed chair Jay Powell said was aimed at maintaining the strength of the world’s largest economy and staving off labour market weakness now that inflation was retreating.

On Friday, the Fed’s preferred inflation gauge fell more than expected to an annual rate of 2.2 per cent in August.

Musalem, who supported the cut in September, acknowledged that the labour market had cooled in recent months, but remained positive about the outlook given the low rate of lay-offs and underlying strength of the economy.

The business sector was in a “good place” with activity overall “solid”, he said, adding that mass lay-offs did not appear “imminent”. Still, he conceded the Fed faced risks that could require it to cut rates more quickly.

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“I’m attuned to the fact that the economy could weaken more than I currently expect [and] the labour market could weaken more than I currently expect,” he said. “If that were the case, then a faster pace of rate reductions might be appropriate.”

That echoed comments from governor Christopher Waller last week, who said he would be “much more willing to be aggressive on rate cuts” if the data weakened more quickly.

Musalem said the risks of the economy weakening or heating up too quickly were now balanced, and the next rate decision would depend on data at the time.

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The Fed’s latest “dot plot” showed most officials expected rates to fall by another half a percentage point over the course of the two remaining meetings of the year. The next meeting is on November 6, a day after the US presidential election.

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Officials had a wide range of views, however, with two of them signalling the Fed should hold off on more cuts, while another seven forecast only one more quarter-point cut this year.

Policymakers also expected the funds rate to fall another percentage point in 2025, ending the year between 3.25 per cent and 3.5 per cent. By the end of 2026, it was estimated to fall just below 3 per cent.

Musalem pushed back on the idea that September’s half-point move was a “catch-up cut” because the Fed had been too slow to ease monetary policy, saying inflation had fallen far faster than he had expected.

“It was appropriate to begin with a strong and clear message to the economy that we’re starting from a position of strength,” he said.

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Trump campaign hack traced to three Iranians seeking to disrupt election, DOJ says

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Trump campaign hack traced to three Iranians seeking to disrupt election, DOJ says

FBI Director Christopher Wray speaks during a news conference in 2023.

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The Justice Department on Friday unveiled criminal charges against three Iranian hackers employed by Iran’s Revolutionary Guard Corp. for targeting and compromising the electronic accounts of Trump campaign aides and others.

The indictment alleges the hacking is part of Iran’s effort to erode confidence in the U.S. electoral process ahead of the November presidential election.

Attorney General Merrick Garland, speaking at a press conference on Friday, said the U.S. government is tracking various plots by Iran to harm American officials, including former president and current Republican presidential nominee Donald Trump.

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“These hackers impersonated US government officials, used the fake personas they created to engage in spearphishing, and then exploited their unauthorized access to trick even more people and steal even more confidential information,” FBI Director Christopher Wray said on Friday, according to his prepared remarks.

The FBI had been investigating after the Trump campaign last month said it had been hacked and suggested Iran was involved, without providing specific evidence for that.

The three men are accused of wire fraud; conspiracy to obtain information from protected computers; and material support to a terrorist organization.

Garland said both the Trump and Harris campaigns have been cooperating with the investigation.

The defendants are outside the reach of the U.S. and it’s not clear when, if ever, American authorities may be able to arrest them.

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Several technology companies have also been monitoring and reporting on hacking threats to the U.S. from foreign countries, including Iran.

Google Threat Intelligence Group’s John Hultquist said Iran’s attacks are constantly evolving.

Hackers from the Iranian Revolutionary Guard “regularly assume the guise of hacktivists or criminals and have increasingly targeted random individuals through email and even text messages,” he said in a statement.

“Most of this activity is designed to undermine trust in security, and is used to attack confidence in elections in particular.”

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Video: What Threats Mean for Trump’s Campaign

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Video: What Threats Mean for Trump’s Campaign

Former President Donald J. Trump’s advisers are considering whether to modify his travel after threats to his life from Iran and two assassination attempts, according to several people briefed on the matter. Maggie Haberman, a senior political correspondent for The New York Times, recounts the ways in which these threats have affected Mr. Trump and his campaign.

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