Spatially resolved K-band spectroscopy of lensed AGN ULAS J0816+2134 at z~7.45

Spatially resolved K-band spectroscopy of lensed AGN ULAS J0816+2134 at z~7.45 | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Spatially resolved K-band spectroscopy of lensed AGN ULAS J0816+2134 at z~7.45 Koptelova Ekaterina, Hwang Chorng-Yuan This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6791420/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract We aim to observe the spatial structure and the MgII2799 broad emission line of the gravitationally lensed active galactic nucleus (AGN) candidate ULAS J081621.49+213442.65 at z=7.453. We report the analysis of the Gemini Near-Infrared Integral Field Spectrograph (NIFS) K-band datacubes acquired in January-February 2024. The observations showed the four lensed components of ULAS J081621.49+213442.65 separated by ~2.2", a foreground lensing galaxy, and a galaxy companion. The MgII2799 emission line was detected in the spectra of the four lensed components at the same redshift and with a similar shape. By modeling the lens configuration, we estimated a significant total flux magnification of ~9.6 mag and an intrinsic UV absolute magnitude of M 3000 ~ -16.72 mag for the source. The magnification-corrected bolometric luminosity and virial black hole mass of ULAS J081621.49+213442.65, (0.35-1.17)×10 44 erg/s and (6.33+/-1.56)×10 4 M sun , fall within the intermediate black hole-mass regime and indicate a super-Eddington growth rate of L bol /L Edd >4. Astrophysics and Cosmology galaxies active individual ULAS J081621.49+213442.65 Full Text Additional Declarations The authors declare no competing interests. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6791420","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":464578625,"identity":"30bb2a22-8a4f-42e8-a690-1e42a3473ebe","order_by":0,"name":"Koptelova Ekaterina","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAABAUlEQVRIie3QMUsDMRTA8XcI3vLcUw7iV3hFqIgHfpXeEpcbOh0dKwVdUlyvH0NcHZ5kyHLcrHTwoOB80qWDgncdSuHO6OiQPyQkIb8MAfD5/mFiN0+aEc4Oz4+dJJgBNStkAD4k+CsR4z+Swd3CVjXFyf1yvd58PMVwHhYEdWbgqn2kpwjL5CYnleQrNRL8ruBCpxTkpQH8gUiRDudI5gxW4xEwG6AXpKOT24ZEDvLZkNNXu6n35MtBopYAGdneFHsSOMhAl8lSk5LDIs1EwQqpUJNnXV4jvlW9RNgF19tpjNLax3rKsSRrHqptdilDzb2k8/27LXfPHcTn8/l8nb4BVfNecNASxt0AAAAASUVORK5CYII=","orcid":"","institution":"NCU","correspondingAuthor":true,"prefix":"","firstName":"Koptelova","middleName":"","lastName":"Ekaterina","suffix":""},{"id":464578626,"identity":"3272853d-239e-4939-9cc0-17ece8460ebd","order_by":1,"name":"Hwang Chorng-Yuan","email":"","orcid":"","institution":"NCU","correspondingAuthor":false,"prefix":"","firstName":"Hwang","middleName":"","lastName":"Chorng-Yuan","suffix":""}],"badges":[],"createdAt":"2025-05-31 14:14:52","currentVersionCode":1,"declarations":{"humanSubjects":false,"vertebrateSubjects":false,"conflictsOfInterestStatement":false,"humanSubjectEthicalGuidelines":false,"humanSubjectConsent":false,"humanSubjectClinicalTrial":false,"humanSubjectCaseReport":false,"vertebrateSubjectEthicalGuidelines":false},"doi":"10.21203/rs.3.rs-6791420/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-6791420/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":83800590,"identity":"918b2d9e-f045-4295-aca6-fea37a2a0284","added_by":"auto","created_at":"2025-06-03 02:51:59","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1298650,"visible":true,"origin":"","legend":"","description":"","filename":"AALULASLENS.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6791420/v1_covered_189fd7e6-fadb-4224-8e50-5d8a6a6d197c.pdf"}],"financialInterests":"The authors declare no competing interests.","formattedTitle":"\u003cp\u003eSpatially resolved K-band spectroscopy of lensed AGN ULAS J0816+2134 at z~7.45\u003c/p\u003e","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"National Science Counsile of Taiwan","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"galaxies, active, individual, ULAS J081621.49+213442.65","lastPublishedDoi":"10.21203/rs.3.rs-6791420/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6791420/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eWe aim to observe the spatial structure and the MgII2799 broad emission line of the gravitationally\u003c/p\u003e\n\u003cp\u003elensed active galactic nucleus (AGN) candidate ULAS J081621.49+213442.65 at z=7.453. 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