The real deal: Astronomers deliver first photo of black hole
Paris, Apr 10: Astronomers on Wednesday unveiled the first photo of a black hole, one of the star-devouring monsters scattered throughout the Universe and obscured by impenetrable shields of gravity.
The image of a dark core encircled by a flame-orange halo of white-hot gas and plasma looks like any number of artists' renderings over the last 30 years.
But this time, it's the real deal.
Scientists have been puzzling over invisible "dark stars" since the 18th century, but never has one been spied by a telescope, much less photographed.
The supermassive black hole now immortalised by a far-flung network of radio telescopes is 50 million lightyears away in a galaxy known as M87.
"It's a distance that we could have barely imagined," Frederic Gueth, an astronomer at France's National Centre for Scientific Research (CNRS) and co-author of studies detailing the findings, said.
Most speculation had centred on the other candidate targeted by the Event Horizon Telescope -- Sagittarius A*, the black hole at the centre of our own galaxy, the Milky Way.
By comparison, Sag A* is only 26,000 lightyears from Earth.
Locking down an image of M87's supermassive black hole at such distance is comparable to photographing a pebble on the Moon.
European Space Agency astrophysicist Paul McNamara called it an "outstanding technical achievement".
It was also a team effort.
"Instead of constructing a giant telescope that would collapse under its own weight, we combined many observatories," Michael Bremer, an astronomer at the Institute for Millimetric Radio Astronomy (IRAM) in Grenoble, told AFP.
Over several days in April 2017, eight radio telescopes in Hawaii, Arizona, Spain, Mexico, Chile, and the South Pole zeroed in on Sag A* and M87.
Knit together "like fragments of a giant mirror," in Bremer's words, they formed a virtual observatory some 12,000 kilometres across roughly the diameter of Earth.
In the end, M87 was more photogenic. Like a fidgety child, Sag A* was too "active" to capture a clear picture, the researchers said.
"The telescope is not looking at the black hole per se, but the material it has captured," a luminous disk of white-hot gas and plasma known as an accretion disk, said McNamara, who was not part of the team.
"The light from behind the black hole gets bent like a lens." The unprecedented image so often imagined in science and science fiction has been analysed in six studies co-authored by 200 experts from 60-odd institutions and published Wednesday in Astrophysical Journal Letters.
"I never thought that I would see a real one in my lifetime," said CNRS astrophysicist Jean-Pierre Luminet, author in 1979 of the first digital simulation of a black hole.
Coined in the mid-60s by American physicist John Archibald Wheeler, the term "black hole" refers to a point in space where matter is so compressed as to create a gravity field from which even light cannot escape.
The more mass, the bigger the hole.
At the same scale of compression, Earth would fit inside a thimble. The Sun would measure a mere six kilometres edge-to-edge.
A successful outcome depended in part on the vagaries of weather during the April 2017 observation period.
"For everything to work, we needed to have clear visibility at every (telescope) location worldwide'', said IRAM scientist Pablo Torne, recalling collective tension, fatigue and, finally, relief.
Torne was at the controls of the Pico Veleta telescope in Spain's Sierra Madre mountains.
After that, is was eight months of nail-biting while scientists at MIT Haystack Observatory in Massachusetts and the Max Planck Institute for Radio Astronomy in Bonn crunched the data.
The Universe is filled with electromagnetic "noise", and there was no guarantee M87's faint signals could be extracted from a mountain of data so voluminous it could not be delivered via the Internet.
There was at least one glitch.
"We were desperately waiting for the data from the South Pole Telescope, which -- due to extreme weather conditions during the southern hemisphere winter -- didn't arrive until six months later," recalled Helger Rottmann from the Max Planck Institute.
It arrived, to be precise, on December 23, 2017.
"When, a few hours later, we saw that everything was there, it was one hell of a Christmas present," Rottmann said.
It would take another year, however, to piece together the data into an image.
"To be absolutely sure, we did the work four times with four different teams," said Gueth.
Each team came up with exactly the same spectacular, history-making picture of a dark circle encased in a flaming-red halo.
#BreakingNews Astronomers capture first image of a #BlackHole! @ESO @ALMAObs & APEX contributed to observations of gargantuan black hole at the heart of galaxy Messier 87.#RealBlackHole
— ESO (@ESO) April 10, 2019
Web: https://t.co/CTJHrg5MN9
Press Release: https://t.co/HKGF6eG4ru
Credit: EHT Collaboration pic.twitter.com/MOqSNr2rxh
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UDF leaders see local body poll trends as pointer to 2026 Assembly elections in Kerala
Thiruvananthapuram (PTI): Buoyed by the strong performance of the Congress-led UDF in the local body polls, KPCC president Sunny Joseph said on Saturday that the front's results indicated the people had rejected the LDF government.
According to early trends, the UDF was leading in more grama panchayats, block panchayats, municipalities and corporations than the LDF.
The local body polls were held in two phases in the state earlier this week.
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Speaking to reporters here, Joseph said the people of Kerala had extended their support to the UDF.
"We could expose the LDF government’s anti-people stance and the people understood it. The LDF’s fake propaganda was rejected by the people. The UDF is moving towards a historic victory," he said.
He said a united effort, proper preparations, good candidate selection and hard work had resulted in the Congress and the UDF’s victory in the elections.
Asked about the prospects in the Thiruvananthapuram Corporation, Joseph said the party was studying the matter and would comment later.
LDF convenor T P Ramakrishnan said the results would be closely examined.
According to him, the government had done everything possible for the people.
"Why such a verdict happened will be examined at the micro level. People’s opinion will be considered and further steps will be taken," he said.
He added that decisions would be taken after analysing the results. "If any corrective measures are required, we will initiate them and move forward," he said.
AICC leader K C Venugopal said the results showed that people had begun ousting those who, he alleged, were responsible for the loss of gold at Lord Ayyappa’s temple.
"This trend will continue in the Assembly elections as well. It is an indication that the people are ready to bring down the LDF government," he said.
Venugopal said the UDF had registered victories even in CPI(M) and LDF strongholds.
"I congratulate all UDF workers for their hard work. Congress workers and leaders worked unitedly," he said.
Referring to remarks made by Chief Minister Pinarayi Vijayan against the Congress on polling day, Venugopal said the voters had responded through the verdict.
"I do not know whether the chief minister understands that the people are against him. Otherwise, he does not know the sentiment of the people. The state government cannot move an inch further," he said.
He said the results indicated a strong comeback for the UDF in Kerala.
Asked whether the Sabarimala gold loss issue had affected the LDF in the local polls, Venugopal said the CM and the CPI(M) state secretary did not take the issue seriously.
"We took a strong stand on the matter. The BJP played a foul game in it," he alleged.
On the BJP's role in the local body elections, Venugopal alleged that the party operated with the CPI(M) 's tacit support.
"The CPI(M) supported the central government on issues such as PM-SHRI, labour codes and corruption in national highway construction. The CPI(M) is facing ideological decline, and the state government’s policies are against the party’s own decisions," he said.
Meanwhile, LDF ally Kerala Congress (M) leader Jose K Mani said the party could not win all the wards it had expected in the elections.
He congratulated winners from all parties and said the party would closely examine the losses and identify shortcomings. "Later, we will take corrective measures," he added.
Senior Congress leader and MP Rajmohan Unnithan said the trends in the local body elections indicated that the UDF would return to power in the 2026 Assembly elections.
"We will win 111 seats as in 1977 and return to power in 2026. The anti-government sentiment of the people is reflected in the elections," he said.
Unnithan said the people were disturbed and unhappy with the present government.
"The trend indicates the end of the LDF government," he added.
CPI(M) MLA M M Mani said the people had shown ingratitude towards the LDF despite benefiting from welfare schemes.
"After receiving all welfare schemes and living comfortably, people voted against us due to some temporary sentiments. Is that not ingratitude," he asked.
Mani said no such welfare initiatives had taken place in Kerala earlier.
"People are receiving pensions and have enough to eat. Even after getting all this, they voted against us. This is what can be called ingratitude," he said.
Muslim League state president Panakkad Sayyid Sadiq Ali Shihab Thangal said the results were beyond expectations.
"The outcome points towards the Secretariat in Thiruvananthapuram, indicating that a change of government is imminent. We are going to win the Assembly election," he said.
