{"id":6659,"date":"2012-12-04T18:00:27","date_gmt":"2012-12-05T04:00:27","guid":{"rendered":"http:\/\/darkerview.com\/wordpress\/?p=6659"},"modified":"2012-12-04T16:23:14","modified_gmt":"2012-12-05T02:23:14","slug":"astronomers-go-infrared-to-map-brightest-galaxies-in-universe","status":"publish","type":"post","link":"https:\/\/darkerview.com\/wordpress\/?p=6659","title":{"rendered":"Astronomers Go Infrared to Map Brightest Galaxies in Universe"},"content":{"rendered":"

W. M. Keck Observatory press release<\/a>…<\/p>\n

A group of astronomers from the University of Hawaii at Manoa, the U.S. Mainland, Canada, and Europe recently used the twin telescopes of the W. M. Keck Observatory on Mauna Kea, Hawaii, to conduct a census of the brightest, but until now unseen, galaxies in the distant Universe, bringing astronomers one step closer to understanding how galaxies form and evolve.<\/p>\n

\"Looking<\/a>
A 3D projection of almost 300 galaxies in the census in the same part of the sky.<\/figcaption><\/figure>These galaxies glow so brightly at infrared wavelengths that they would outshine our own Milky Way by hundreds, maybe thousands, of times. They are forming stars so quickly that between 100 and 500 new stars are born in each galaxy every year, and have been coined \u201cstarbursts\u201d by astronomers.<\/p>\n

While it\u2019s not clear what gives these galaxies their intense luminosity, it could be the result of a collision between two spiral-type galaxies, similar to the Milky Way and Andromeda Galaxies. Or they could be in a particularly gas-rich region of space, where galaxies form stars quickly due to constant bombardment from gas and dust.<\/p>\n

Despite their brightness, these galaxies are nearly invisible at the wavelengths our eyes and most telescopes on Earth can see because they contain huge amounts of dust, which absorbs visible starlight. But they were detectable directly in the infrared from observations at the Herschel Space Observatory, said Dr. Caitlin Casey, a Hubble fellow at the UH Manoa Institute for Astronomy and the lead scientist behind the new results. \u201cHerschel is an infrared space telescope sensitive to wavelengths not observable from within Earth\u2019s atmosphere,\u201d she said.<\/p>\n

\u201cDetecting these bright infrared galaxies used to be difficult, and a handful was plenty; now with Herschel we are finding them by the thousands, enabling a census like this,\u201d said G\u00f6ran Pilbratt, European Space Agency Herschel Project Scientist.<\/p>\n

Once found, taking measurements of these galaxies at visible wavelengths required using the 10-meter Keck telescopes, the two largest optical telescopes in the world. Over the course of several nights the group was able to detect and measure distances to nearly 800 of these galaxies.<\/p>\n

\u201cFor the first time, we have been able to measure distances, star formation rates, and temperatures for a brand new set of 767 previously unidentified galaxies,\u201d said Dr. Scott Chapman, a co-author on the studies. \u201cThe previous similar survey of distant infrared starbursts only covered 73 galaxies. This is a huge improvement.\u201d<\/p>\n

\u201cWhile some of the galaxies are nearby, most are very distant; we even found galaxies that are so far that their light has taken 12 billion years to travel here, so we are seeing them when the Universe was only a ninth of its current age,\u201d Casey said. \u201cNow that we have a pretty good idea of how important this type of galaxy is in forming huge numbers of stars in the Universe, the next step is to figure out why and how they formed.\u201d<\/p>\n

\u201cIt\u2019s hard to figure out how most galaxies formed based on information from only a small part of the Universe, just like it\u2019s hard to guess how big an elephant is if you only get a glimpse of its tail,\u201d Casey said. \u201cNow that we have an accurate census of starbursting galaxies across a huge time period in the Universe\u2019s history, we can start to piece together how these galaxies grew and evolved.\u201d<\/p>\n

Two papers detailing these results are published online today in the Astrophysical Journal.<\/p>\n","protected":false},"excerpt":{"rendered":"

W. M. Keck Observatory press release… A group of astronomers from the University of Hawaii at Manoa, the U.S. Mainland, Canada, and Europe recently used the twin telescopes of the W. M. Keck Observatory on Mauna Kea, Hawaii, to conduct a census of the brightest, but until now unseen, galaxies in the distant Universe, bringing … Continue reading “Astronomers Go Infrared to Map Brightest Galaxies in Universe”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[9],"tags":[341,232,50,433],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/darkerview.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/6659"}],"collection":[{"href":"https:\/\/darkerview.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/darkerview.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/darkerview.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/darkerview.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6659"}],"version-history":[{"count":0,"href":"https:\/\/darkerview.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/6659\/revisions"}],"wp:attachment":[{"href":"https:\/\/darkerview.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6659"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/darkerview.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6659"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/darkerview.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6659"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}