{"id":54522,"date":"2018-01-30T09:22:34","date_gmt":"2018-01-30T15:22:34","guid":{"rendered":"https:\/\/uwm.edu\/news\/?p=54522"},"modified":"2018-02-01T14:13:57","modified_gmt":"2018-02-01T20:13:57","slug":"uwm-astronomers-use-new-tool-hunt-gravitational-wave-events","status":"publish","type":"post","link":"https:\/\/uwm.edu\/news\/uwm-astronomers-use-new-tool-hunt-gravitational-wave-events\/","title":{"rendered":"51ÁÔÆæ astronomers to use new tool to hunt gravitational-wave sources"},"content":{"rendered":"

It\u2019s fair to say good luck played a role in the prompt discovery of an optical (and radio, X-ray, ultraviolet and infrared) counterpart to the gravitational waves from colliding neutron stars found last August<\/a>.<\/p>\n

But it\u2019s also true that scientists don\u2019t like to lean too hard on good luck, so astronomers have been developing a more systematic way to search for objects detected by the Laser Interferometer Gravitational-Wave Observatory<\/a>.<\/p>\n

The University of Wisconsin-Milwaukee is a partner in the Zwicky Transient Facility<\/a>, the latest tool for capturing astronomical observations of short-lived, or transient, phenomena. ZTF recently saw \u201cfirst light,\u201d taking its first detailed image of the night sky. In February, it will begin a regular program of swiftly scanning the entire sky to search for cosmic explosions, such as novae and supernova. The facility is also well-suited to discovering members of the solar system, principally asteroids and comets.<\/p>\n

And it is ideal for locating the sources of gravitational-wave events detected by LIGO.<\/p>\n

\u201cWe were really lucky in August to have a small area to search for the LIGO event, and we found it quickly,\u201d said astronomer David Kaplan, an associate professor of physics at 51ÁÔÆæ.<\/p>\n

\u201cWe won\u2019t always be that lucky,\u201d Kaplan said. \u201cWe expect LIGO to detect more collisions like the merger of neutron stars we observed last September. The opportunity to view these at a variety of wavelengths \u2013 which is key to understanding them more fully \u2013 requires that we have a facility like ZTF to pinpoint their locations.\u201d<\/p>\n

51ÁÔÆæ brings important expertise to the project. Kaplan, physics Professor Patrick Brady and postdoctoral researchers Angela Van Sistine and Shoan Ghosh, along with graduate students Deep Chatterjee and Chaoran Zhang, have devised a strategy for aiming the instrument to find LIGO events. Search efficiency is important because LIGO can\u2019t give precise locations; ZTF will have to scan a relatively large swath of the sky in discrete chunks, referred to as \u201ctiles\u201d by the ZTF team, to locate the astronomical counterparts of the LIGO events.<\/p>\n

Van is the data quality scientist for ZTF. Her job is to communicate with the users of the data, the engineering team and the image processing team.<\/p>\n

\u201cIf the data doesn\u2019t meet the scientists\u2019 requirements, they\u2019d come to me, and I\u2019ll troubleshoot with the engineering and image processing teams,\u201d she said.<\/p>\n

Ghosh is working on a program to automatically prioritize and schedule follow-up to LIGO detections. LIGO provides data to his software, and the software determines the best observing schedule. That gets automatically passed along to the telescope; there\u2019s no time for humans to make decisions.<\/p>\n

Chatterjee is working on discovering the limits of ZTF\u2019s ability to detect faint outbursts, and Zhang is looking to help guess in advance where to look.<\/p>\n

\u201cThat\u2019s important when in the future we\u2019re attempting to calculate the rate of, for example, neutron star collisions,\u201d said.<\/p>\n

ZTF is a massive update to a 48-inch telescope on Mount Palomar in Southern California, with a state-of-the-art digital camera and image processing facilities. Each image covers an area of 200 full moons and is 2.4 GB in size, but can capture objects that are millions of times fainter than what\u2019s visible with the naked eye.<\/p>\n

Every night, ZTF will scan of about a third of the entire sky visible from the Mount Palomar, capturing electronic images in a standard array of about 400\u00a0 \u201ctiles.\u201d \u00a0The system will compare the images to earlier images and point out any new or changed light sources. Once verified, discoveries can be shared with astronomers via networks such as GROWTH<\/a> (The Global Relay of Observatories Watching Transients Happen), of which Kaplan is a member.<\/p>\n

ZTF builds on the Palomar Transient Factory<\/a>, which went into operation in 2009. In the future, even larger surveys will build on ZTF’s rapid scans of the sky. The Large Synoptic Survey Telescope<\/a> is scheduled to be operational in 2023.<\/p>\n

All this is a linchpin of the new field of \u201cmulti-messenger astronomy,\u201d in which a variety of telescopes \u2013 from gamma ray detectors to radio telescopes \u2013 can quickly be brought to bear on short-lived cosmic phenomena like supernova and neutron star collisions. And getting LIGO involved is a key.<\/p>\n

\u201cThe promise of multi-messenger astronomy is that you could unlock a whole new realm of physics,\u201d Kaplan said. \u201cThe combination of traditional astronomy and gravitational wave astronomy is much more the sum of its parts.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

The LIGO observations of gravitational wave over the past two years were groundbreaking. Now, 51ÁÔÆæ astronomers plan to build off that work by employing a new tool to decode more mysteries of the sky.<\/p>\n","protected":false},"author":81,"featured_media":54526,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","uwm_wg_additional_authors":[]},"categories":[174,175],"tags":[],"section":[140,139],"display_categories":[115,116],"related-coverage":[282],"uwmnews-feed":[167,158,153,161],"class_list":["post-54522","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-research","section-science","section-science-technology","display_categories-top-story-secondary","display_categories-top-story-section","related-coverage-physics","uwmnews-feed-alumni-association","uwmnews-feed-letters-science","uwmnews-feed-graduate","uwmnews-feed-hard-science"],"yoast_head":"\n51ÁÔÆæ astronomers to use new tool to hunt gravitational-wave sources<\/title>\n<meta name=\"description\" content=\"The LIGO observations of gravitational wave over the past two years were groundbreaking. 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