The Hidden Past of M92: Detection and Characterization of a Newly Formed 17 degrees Long Stellar Stream Using the Canada-France Imaging Survey

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TitreThe Hidden Past of M92: Detection and Characterization of a Newly Formed 17 degrees Long Stellar Stream Using the Canada-France Imaging Survey
Type de publicationJournal Article
Year of Publication2020
AuteursThomas GF, Jensen J, McConnachie A, Cote P, Venn K, Longeard N, Carlberg R, Chapman S, Cuillandre J-C, Famaey B, Ferrarese L, Gwyn S, Hammer F, Ibata RA, Malhan K, Martin NF, Mei S, Navarro JF, Reyle C, Starkenburg E
JournalASTROPHYSICAL JOURNAL
Volume902
Pagination89
Date PublishedOCT
Type of ArticleArticle
ISSN0004-637X
Mots-clésGalaxy formation, Globular star clusters, Milky Way dynamics, Milky Way stellar halo
Résumé

We present an analysis of the structure, kinematics, and orbit of a newly found stellar stream emanating from the globular cluster M92 (NGC 6341). This stream was discovered in an improved matched-filter map of the outer Galaxy, based on a ``color-color-magnitude'' diagram, created using photometry from the Canada-France Imaging Survey and the Pan-STARRS 1 3 pi survey. We find the stream to have a length of 17 degrees (2.5 kpc at the distance of M92), a width dispersion of 029(42 pc), and a stellar mass of [3.17 0.89] x 10(4)M(10% of the stellar mass of the current main body of M92). We examine the kinematics of main-sequence, red giant, and blue horizontal branch stars belonging to the stream and that have proper motion measurements from the second data release of Gaia.N-body simulations suggest that the stream was likely formed very recently (during the last similar to 500 Myr) forcing us to question the orbital origin of this ancient, metal-poor globular cluster.

DOI10.3847/1538-4357/abb6f7