{"id":451751,"date":"2022-09-19T19:07:18","date_gmt":"2022-09-19T22:07:18","guid":{"rendered":"https:\/\/revistapesquisa.fapesp.br\/?p=451751"},"modified":"2022-09-19T19:07:18","modified_gmt":"2022-09-19T22:07:18","slug":"like-2400-eyes-in-the-sky","status":"publish","type":"post","link":"https:\/\/revistapesquisa.fapesp.br\/en\/like-2400-eyes-in-the-sky\/","title":{"rendered":"Like 2,400 eyes in the sky"},"content":{"rendered":"

A Brazilian research group is putting the final touches on its contribution to the Japanese Subaru telescope on the peak of Mauna Kea, in Hawaii. Designed and constructed in Brazil, the last cable for the fiber optic system arrived by air at its final destination in early June. Once it is joined to the first two cables, which were delivered in 2020 and 2021, the complex will have 2,394 optical fibers\u2014distributed over a 65-meter length\u2014with microlenses attached to the ends that will work like small eyes pointed to the sky. The subsystem will be an essential part of the latest generation of Prime Focus Spectrograph (PFS), a type of observatory equipment used to estimate the chemical composition, speed, distance, and age of a star. Built by an international consortium, the new PFS is scheduled to begin operating in late 2023.<\/p>\n

\u201cOnce the PFS starts operating, the Subaru will be the world’s most advanced ground-based telescope for studying very distant galaxies and stars,\u201d says astrophysicist Laerte Sodr\u00e9 J\u00fanior, from the Institute of Astronomy, Geophysics, and Atmospheric Sciences at the University of S\u00e3o Paulo (IAG-USP), the coordinator of the optical fiber project. This is because by implementing the new spectrograph the Japanese telescope\u2014whose mirror measures 8.2 meters in diameter\u2014will be able to observe almost 2,400 astronomical objects simultaneously. \u201cThere has never been a spectrograph with this number of fibers installed in a telescope of this size,\u201d Sodr\u00e9 observes.<\/p>\n

He points out that the Dark Energy Spectroscopic Instrument (DESI), a spectrograph that began operating last year at the Kitt Peak National Observatory in the United States, has 5,000 optical fibers, however, they are in a telescope with a mirror half the size of the Subaru. \u201cWith Subaru we will have a view area that’s four times larger for observing a particular region, in other words, the data collection will be four times faster. The Subaru has two defining features: the optical quality and the large area for light collection,\u201d he explains. The more light that is received, which is proportional to the area, the faster and more efficiently data is collected, increasing the ability to observe fainter objects. Subaru has one of the world’s largest digital cameras, the Hyper Suprime-Cam (HSC)\u2014a key technology for creating cosmic maps\u2014that captures an area nine times the size of the full moon, with 870-megapixel resolution.<\/p>\n

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Julie Thurston Photography \/ Getty Images <\/span>The Subaru Telescope at the top of Mauna Kea, HawaiiJulie Thurston Photography \/ Getty Images <\/span><\/p><\/div>\n

Over the next five years, the plan is for the PFS to be shared by the researchers who participated in its construction\u2014within the scope of the international consortium formed by Japan, Brazil, Germany, the United States, and China\u2014in order to collect millions of data points on the cosmology, evolution, and archaeology of galaxies. In practice, this will enable studies on the nature of dark matter and the exploration for more clues to how the Milky Way itself formed, to name two examples. \u201cMuch research indicates that during its evolution the Milky Way has been swallowing dwarf galaxies, which once functioned as satellites. The PFS will help us unravel when dwarf galaxies formed and better understand the history of our own galaxy,\u201d the astrophysicist says.<\/p>\n

Over the project’s 12-year history, around 30 researchers, engineers, and technicians from IAG-USP, the National Astrophysics Laboratory (LNA), and the private firm Oliveira Instrumenta\u00e7\u00e3o \u00d3ptica (OIO) participated in the design and development of the optical system components, which was given the name FOCCOS (for “fiber optic cable and connector system”). They developed three cables with 42 fiber optic modules each, in addition to adapted connectors that allow for maintenance at detachable junctions. The cables will be connected to the three arms of the four spectrograph modules, whose cameras take readings in the blue, red, and infrared spectrum.<\/p>\n

After the testing period for these last elements in Hawaii, the FOCCOS will be completely integrated into the PFS’s primary focus instrument, the area that receives the light reflected by the 8-meter mirror. The fiber optic system will function as the corridor for the captured light. The modules will be installed in 57 rotating devices that will allow the repositioning of the fibers towards the observed object, ensuring that more precise data will be obtained.<\/p>\n

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LNA \/ MCTI<\/span>Part of the optical fiber system developed in BrazilLNA \/ MCTI<\/span><\/p><\/div>\n

\u201cWe’re going to see the PFS become a reality almost 20 years after the initial idea of building it,\u201d Sodr\u00e9 says. Originally, the spectrograph was designed for the Gemini telescope, also on Mauna Kea, however, the researcher says the initial project was canceled due to a lack of funds. It was then that the University of Tokyo became interested in the PFS for its Subaru telescope. The budget for FOCCOS is estimated at US$5 million, with US$1 million invested by FAPESP through thematic projects and grants, close to R$100,000 coming from the National Council for Scientific and Technological Development (CNPq), and the remainder going to the salaries of team members over the last ten years.<\/p>\n

Physicist Luiz Vitor de Souza Filho, from the S\u00e3o Carlos Institute of Physics (IFSC) at USP, who is also chairman of the board of the international scientific collaboration that coordinates the Cherenkov Telescope Array (CTA)\u2014and did not participate in the PFS project\u2014says Brazil has improved its capacity in astronomical instrumentation over the last 20 years. \u201cWe see this reflected by an increase in the country’s participation in astronomical research and discoveries. We have access to important data, which wasn’t possible before we were part of constructing large instruments,\u201d he observes.<\/p>\n

In addition, the physicist points to the advancement in technology and innovation. \u201cProjects like the PFS work at the limit of our technological development, presenting challenges like optical instruments, micromotors for precision movements, and sensors, among others, for Brazilian industry,\u201d he says.<\/p>\n

\u201cWhat we discover in our research may affect us a century from now, but instrumentation provides an immediate impact on Brazil’s capacity building,\u201d says Souza Filho. He believes there are three major projects that will stand out over the next 30 years: the PFS, the Giant Magellanic Telescope (GMT) under construction in Chile, and the CTA itself, which Souza Filho coordinates. \u201cOur challenge now is to maintain our group of researchers, engineers, and technicians over the long term,\u201d says Sodr\u00e9, who is also the coordinator of the GMT.<\/p>\n","protected":false},"excerpt":{"rendered":"Equipment installed in Hawaii will significantly increase our ability to study distant galaxies and very faint stars","protected":false},"author":684,"featured_media":451784,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[159],"tags":[205,235],"coauthors":[2721],"class_list":["post-451751","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","tag-astronomy","tag-physics"],"acf":[],"_links":{"self":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/451751","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/users\/684"}],"replies":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/comments?post=451751"}],"version-history":[{"count":1,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/451751\/revisions"}],"predecessor-version":[{"id":451826,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/451751\/revisions\/451826"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/media\/451784"}],"wp:attachment":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/media?parent=451751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/categories?post=451751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/tags?post=451751"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/coauthors?post=451751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}