Extended Universal Rotational Curve of Spiral Galaxies

Extended Universal Rotational Curve of Spiral Galaxies | 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 Extended Universal Rotational Curve of Spiral Galaxies Esha Bhatia, Paolo Salucci, Tiziano Schiavone, Sandeep Haridasu This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8894754/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 11 You are reading this latest preprint version Abstract In this work, we aim to advance the Universal Rotation Curve (URC) paradigm by leveraging new data and extending its observational domain. Building on previous studies that established the URC using optical rotation curves reaching the galaxy optical radius Ropt , we exploit the SPARC sample’s extended HI rotation curves to construct the URC out to 2 Ropt . This crucial extension enables us to investigate the mass distribution of spiral galaxies in a region dominated by dark matter—an important step to better constrain galaxy mass models and to explore the nature of the dark matter particle. We find that the URC constructed from the SPARC sample’s extended HI rotation curves maintains its universal character out to 2 Ropt , with the double-normalized rotation curves collapsing onto a single profile. This extended URC provides new insights into the interplay between baryonic matter and dark matter in shaping galaxy rotation curves, particularly in the outer regions where dark matter dominates. Our results not only reinforce the URC paradigm but also refine our understanding of the mass distribution in spiral galaxies, offering new constraints on galaxy mass models and implications for the nature of dark matter. galaxies: formation galaxies: haloes galaxies: kinematics and dynamics dark matter Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 20 Apr, 2026 Reviews received at journal 17 Apr, 2026 Reviewers agreed at journal 17 Apr, 2026 Reviews received at journal 06 Apr, 2026 Reviewers agreed at journal 25 Mar, 2026 Reviewers agreed at journal 22 Mar, 2026 Reviewers invited by journal 27 Feb, 2026 Editor invited by journal 27 Feb, 2026 Editor assigned by journal 17 Feb, 2026 Submission checks completed at journal 17 Feb, 2026 First submitted to journal 16 Feb, 2026 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. 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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-8894754","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":598048042,"identity":"3c70a416-2f3b-4664-b0f0-a217df50744c","order_by":0,"name":"Esha Bhatia","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAxElEQVRIiWNgGAWjYBACAyBmZmCw4WGDCvAQqyWNh42NRC2HGRjYCKqFAnMG5sOfC2rOy/DJt19g+FHDIGNOSItlA1ua9Ixjt4EO4ylg7DnGwGPZQMhhB3jMmHnYwFoSGHgbGHgMDhDUwv/5M8+/c2AtjH+J08LDIM3bdgCohf0AM1G2WDazmUnz9iUDteQwHJY5JkFYizl78+PPPN/s7OWbjz98+KbGxp6gFlCkQAHYfAlC6lEA+wOSlI+CUTAKRsHIAQAa7zGdvmr1CwAAAABJRU5ErkJggg==","orcid":"","institution":"Indian Institute of Technology Guwahati","correspondingAuthor":true,"prefix":"","firstName":"Esha","middleName":"","lastName":"Bhatia","suffix":""},{"id":598048044,"identity":"7a15d405-9bbc-4707-9baf-51850f9fe305","order_by":1,"name":"Paolo Salucci","email":"","orcid":"","institution":"Scuola Internazionale Superiore di Studi Avanzati","correspondingAuthor":false,"prefix":"","firstName":"Paolo","middleName":"","lastName":"Salucci","suffix":""},{"id":598048046,"identity":"8d36e628-1145-468c-adee-7054b9806899","order_by":2,"name":"Tiziano Schiavone","email":"","orcid":"","institution":"Scuola Internazionale Superiore di Studi Avanzati","correspondingAuthor":false,"prefix":"","firstName":"Tiziano","middleName":"","lastName":"Schiavone","suffix":""},{"id":598048048,"identity":"9f970173-7918-4558-b1f1-83baeca02c5d","order_by":3,"name":"Sandeep Haridasu","email":"","orcid":"","institution":"Scuola Internazionale Superiore di Studi Avanzati","correspondingAuthor":false,"prefix":"","firstName":"Sandeep","middleName":"","lastName":"Haridasu","suffix":""}],"badges":[],"createdAt":"2026-02-16 16:24:13","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-8894754/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-8894754/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":104401071,"identity":"cd6f257e-7056-43b6-a715-5fb4dd5a484a","added_by":"auto","created_at":"2026-03-11 12:11:47","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":4776685,"visible":true,"origin":"","legend":"","description":"","filename":"URCSPACE.pdf","url":"https://assets-eu.researchsquare.com/files/rs-8894754/v1_covered_44debdc1-06f2-4b85-8226-d61a93c6cb50.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Extended Universal Rotational Curve of Spiral Galaxies","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"discover-space","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"","sideBox":"Learn more about [Discover Space](https://link.springer.com/journal/11038)","snPcode":"11038","submissionUrl":"https://submission.springernature.com/new-submission/11038/3","title":"Discover Space","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Discover Series","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"galaxies: formation, galaxies: haloes, galaxies: kinematics and dynamics, dark matter","lastPublishedDoi":"10.21203/rs.3.rs-8894754/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-8894754/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eIn this work, we aim to advance the Universal Rotation Curve (URC) paradigm by leveraging new data and extending its observational domain. 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