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{"id":17849,"date":"2023-01-23T21:58:07","date_gmt":"2023-01-23T21:58:07","guid":{"rendered":"https:\/\/scienceandnerds.com\/2023\/01\/23\/standard-model-of-cosmology-survives-a-telescopes-surprising-finds\/"},"modified":"2023-01-23T21:58:08","modified_gmt":"2023-01-23T21:58:08","slug":"standard-model-of-cosmology-survives-a-telescopes-surprising-finds","status":"publish","type":"post","link":"https:\/\/scienceandnerds.com\/2023\/01\/23\/standard-model-of-cosmology-survives-a-telescopes-surprising-finds\/","title":{"rendered":"Standard Model of Cosmology Survives a Telescope\u2019s Surprising Finds"},"content":{"rendered":"

Source:https:\/\/www.quantamagazine.org\/standard-model-of-cosmology-survives-jwsts-surprising-finds-20230120\/<\/a><\/br>
\nStandard Model of Cosmology Survives a Telescope\u2019s Surprising Finds<\/br>
\n2023-01-23 21:58:07<\/br><\/p>\n

\n

Researchers use a version of the Doppler effect to gauge the distances of objects. This is similar to figuring out the location of an ambulance based on its siren: The siren sounds higher in pitch as it approaches and then lower as it recedes. The farther away a galaxy is, the faster it moves away from us, and so its light stretches to longer wavelengths and appears redder. The magnitude of this \u201credshift\u201d is expressed as z<\/em>, where a given value for z<\/em> tells you how long an object\u2019s light must have traveled to reach us.<\/p>\n

One of the first papers<\/a> on JWST data came from Naidu, the MIT astronomer, and his colleagues, whose search algorithm flagged a galaxy that seemed inexplicably bright and unaccountably distant. Naidu dubbed it GLASS-z13, indicating its apparent distance at a redshift of 13 \u2014 further away than anything seen before. (The galaxy\u2019s redshift was later revised down to 12.4, and it was renamed GLASS-z12.) Other astronomers working on the various sets of JWST observations were reporting redshift values from 11 to 20, including one galaxy called CEERS-1749<\/a> or CR2-z17-1, whose light appears to have left it 13.7 billion years ago, just 220 million years after the Big Bang \u2014 barely an eyeblink after the beginning of cosmic time.<\/p>\n

These putative detections suggested that the neat story known as \u039bCDM might be incomplete. Somehow, galaxies grew huge right away. \u201cIn the early universe, you don\u2019t expect to see massive galaxies. They haven\u2019t had time to form that many stars, and they haven\u2019t merged together,\u201d said Chris Lovell, an astrophysicist at the University of Portsmouth in England. Indeed, in a study<\/a> published in November, researchers analyzed computer simulations of universes governed by the \u039bCDM model and found that JWST\u2019s early, bright galaxies were an order of magnitude heavier than the ones that formed concurrently in the simulations.<\/p>\n

Some astronomers and media outlets claimed that JWST was breaking cosmology, but not everyone was convinced. One problem is that \u039bCDM\u2019s predictions aren\u2019t always clear-cut. While dark matter and dark energy are simple, visible matter has complex interactions and behaviors, and nobody knows exactly what went down in the first years after the Big Bang; those frenetic early times must be approximated in computer simulations. The other problem is that it\u2019s hard to tell exactly how far away galaxies are.<\/p>\n

In the months since the first papers, the ages of some of the alleged high-redshift galaxies have been reconsidered. Some were demoted<\/a> to later stages of cosmic evolution because of updated telescope calibrations. CEERS-1749 is found in a region of the sky containing a cluster of galaxies whose light was emitted 12.4 billion years ago, and Naidu says it\u2019s possible the galaxy is actually part of this cluster \u2014 a nearer interloper that might be filled with dust that makes it appear more redshifted than it is. According to Naidu, CEERS-1749 is weird no matter how far away it is. \u201cIt would be a new type of galaxy that we did not know of: a very low-mass, tiny galaxy that has somehow built up a lot of dust in it, which is something we traditionally do not expect,\u201d he said. \u201cThere might just be these new types of objects that are confounding our searches for the very distant galaxies.\u201d<\/p>\n

The Lyman Break <\/strong><\/h2>\n

Everyone knew that the most definitive distance estimates would require JWST\u2019s most powerful capability.<\/p>\n

JWST not only observes starlight through photometry, or measuring brightness, but also through spectroscopy, or measuring the light\u2019s wavelengths. If a photometric observation is like a picture of a face in a crowd, then a spectroscopic observation is like a DNA test that can tell an individual\u2019s family history. Naidu and others who found large early galaxies measured redshift using brightness-derived measurements \u2014 essentially looking at faces in the crowd using a really good camera. That method is far from airtight. (At a January meeting of the American Astronomical Society, astronomers quipped that maybe half of the early galaxies observed with photometry alone will turn out to be accurately measured.)<\/p>\n

But in early December, cosmologists announced<\/a> that they had combined both methods for four galaxies. The JWST Advanced Deep Extragalactic Survey (JADES) team searched for galaxies whose infrared light spectrum abruptly cuts off at a critical wavelength known as the Lyman break. This break occurs because hydrogen floating in the space between galaxies absorbs light. Because of the continuing expansion of the universe \u2014 the ever-rising raisin loaf \u2014 the light of distant galaxies is shifted, so the wavelength of that abrupt break shifts too. When a galaxy\u2019s light appears to drop off at longer wavelengths, it is more distant. JADES identified spectra with redshifts up to 13.2, meaning the galaxy\u2019s light was emitted 13.4 billion years ago.<\/p>\n

As soon as the data was downlinked, JADES researchers began \u201cfreaking out\u201d in a shared Slack group, according to Kevin Hainline<\/a>, an astronomer at the University of Arizona. \u201cIt was like, \u2018Oh my God, oh my God, we did it we did it we did it!\u2019\u201d he said. \u201cThese spectra are just the beginning of what I think is going to be astronomy-changing science.\u201d<\/p>\n

Brant Robertson<\/a>, a JADES astronomer at the University of California, Santa Cruz, says the findings show that the early universe changed rapidly in its first billion years, with galaxies evolving 10 times quicker than they do today. It\u2019s similar to how \u201ca hummingbird is a small creature,\u201d he said, \u201cbut its heart beats so quickly that it is living kind of a different life than other creatures. The heartbeat of these galaxies is happening on a much more rapid timescale than something the size of the Milky Way.\u201d<\/p>\n

But were their hearts beating too fast for \u039bCDM to explain?<\/p>\n

Theoretical Possibilities<\/strong><\/h2>\n

As astronomers and the public gaped at JWST images, researchers started working behind the scenes to determine whether the galaxies blinking into our view really upend \u039bCDM or just help nail down the numbers we should plug into its equations.<\/p>\n

One important yet poorly understood number concerns the masses of the earliest galaxies. Cosmologists try to determine their masses in order to tell whether they match \u039bCDM\u2019s predicted timeline of galaxy growth.<\/p>\n

A galaxy\u2019s mass is derived from its brightness. But Megan Donahue<\/a>, an astrophysicist at Michigan State University, says that at best, the relationship between mass and brightness is an educated guess, based on assumptions gleaned from known stars and well-studied galaxies.<\/p>\n

One key assumption is that stars always form within a certain statistical range of masses, called the initial mass function (IMF). This IMF parameter is crucial for gleaning a galaxy\u2019s mass from measurements of its brightness, because hot, blue, heavy stars produce more light, while the majority of a galaxy\u2019s mass is typically locked up in cool, red, small stars.<\/p>\n

But it\u2019s possible that the IMF was different in the early universe. If so, JWST\u2019s early galaxies might not be as heavy as their brightness suggests; they might be bright but light. This possibility causes headaches, because changing this basic input to the \u039bCDM model could give you almost any answer you want. Lovell says some astronomers consider fiddling with the IMF \u201cthe domain of the wicked.\u201d<\/p>\n<\/div>\n

<\/br><\/br><\/br><\/p>\n

Uncategorized<\/br>
\n<\/br>
\nSource:
https:\/\/www.quantamagazine.org\/standard-model-of-cosmology-survives-jwsts-surprising-finds-20230120\/<\/a><\/br><\/br><\/p>\n","protected":false},"excerpt":{"rendered":"

Source:https:\/\/www.quantamagazine.org\/standard-model-of-cosmology-survives-jwsts-surprising-finds-20230120\/ Standard Model of Cosmology Survives a Telescope\u2019s Surprising Finds 2023-01-23 21:58:07 Researchers use a version of the Doppler effect to gauge the distances of objects. This is similar to figuring out the location of an ambulance based on its siren: The siren sounds higher in pitch as it approaches and then lower as it […]<\/p>\n","protected":false},"author":1,"featured_media":17850,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","om_disable_all_campaigns":false,"pagelayer_contact_templates":[],"_pagelayer_content":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-17849","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nStandard Model of Cosmology Survives a Telescope\u2019s Surprising Finds - Science and Nerds<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceandnerds.com\/2023\/01\/23\/standard-model-of-cosmology-survives-a-telescopes-surprising-finds\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Standard Model of Cosmology Survives a Telescope\u2019s Surprising Finds - Science and Nerds\" \/>\n<meta property=\"og:description\" content=\"Source:https:\/\/www.quantamagazine.org\/standard-model-of-cosmology-survives-jwsts-surprising-finds-20230120\/ Standard Model of Cosmology Survives a Telescope\u2019s Surprising Finds 2023-01-23 21:58:07 Researchers use a version of the Doppler effect to gauge the distances of objects. 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