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The Large-scale Structure of the Halo of the Andromeda Galaxy. II. Hierarchical Structure in the Pan-Andromeda Archaeological Survey

McConnachie, Alan W; Ibata, Rodrigo A.; Martin, Nicolas F; Ferguson, Annette; Collins, Michelle M. L.; Gwyn, Stephen; Irwin, Mike; Lewis, Geraint Francis; Mackey, Dougal; Davidge, Tim; Arias, Veronica; Tanvir, Nial R; Babul, Arif; Bate, Nicholas F; Dotter, Aaron; Navarro, J F; Puzia, Thomas H; Widrow, L. M.

Description

The Pan-Andromeda Archaeological Survey is a survey of >400 square degrees centered on the Andromeda (M31) and Triangulum (M33) galaxies that has provided the most extensive panorama of an L ∗ galaxy group to large projected galactocentric radii. Here, we collate and summarize the current status of our knowledge of the substructures in the stellar halo of M31, and discuss connections between these features. We estimate that the 13 most distinctive substructures were produced by at least 5...[Show more]

dc.contributor.authorMcConnachie, Alan W
dc.contributor.authorIbata, Rodrigo A.
dc.contributor.authorMartin, Nicolas F
dc.contributor.authorFerguson, Annette
dc.contributor.authorCollins, Michelle M. L.
dc.contributor.authorGwyn, Stephen
dc.contributor.authorIrwin, Mike
dc.contributor.authorLewis, Geraint Francis
dc.contributor.authorMackey, Dougal
dc.contributor.authorDavidge, Tim
dc.contributor.authorArias, Veronica
dc.contributor.authorTanvir, Nial R
dc.contributor.authorBabul, Arif
dc.contributor.authorBate, Nicholas F
dc.contributor.authorDotter, Aaron
dc.contributor.authorNavarro, J F
dc.contributor.authorPuzia, Thomas H
dc.contributor.authorWidrow, L. M.
dc.date.accessioned2021-12-13T22:55:10Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/255201
dc.description.abstractThe Pan-Andromeda Archaeological Survey is a survey of >400 square degrees centered on the Andromeda (M31) and Triangulum (M33) galaxies that has provided the most extensive panorama of an L ∗ galaxy group to large projected galactocentric radii. Here, we collate and summarize the current status of our knowledge of the substructures in the stellar halo of M31, and discuss connections between these features. We estimate that the 13 most distinctive substructures were produced by at least 5 different accretion events, all in the last 3 or 4 Gyr. We suggest that a few of the substructures farthest from M31 may be shells from a single accretion event. We calculate the luminosities of some prominent substructures for which previous estimates were not available, and we estimate the stellar mass budget of the outer halo of M31. We revisit the problem of quantifying the properties of a highly structured data set; specifically, we use the OPTICS clustering algorithm to quantify the hierarchical structure of M31's stellar halo and identify three new faint structures. M31's halo, in projection, appears to be dominated by two "mega-structures," which can be considered as the two most significant branches of a merger tree produced by breaking M31's stellar halo into increasingly smaller structures based on the stellar spatial clustering. We conclude that OPTICS is a powerful algorithm that could be used in any astronomical application involving the hierarchical clustering of points. The publication of this article coincides with the public release of all PAndAS data products.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherIOP Publishing
dc.rights© 2018. The American Astronomical Society
dc.sourceThe Astrophysical Journal
dc.subjectcatalogs
dc.subjectgalaxies: general
dc.subjectgalaxies: structure
dc.subjectLocal Group
dc.titleThe Large-scale Structure of the Halo of the Andromeda Galaxy. II. Hierarchical Structure in the Pan-Andromeda Archaeological Survey
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume868
dc.date.issued2018
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationu3102795xPUB110
local.publisher.urlhttp://iopscience.iop.org/0004-637X
local.type.statusPublished Version
local.contributor.affiliationMcConnachie, Alan W, Dominion Astrophysical Observatory
local.contributor.affiliationIbata, Rodrigo A., Observatoire de Strasbourg
local.contributor.affiliationMartin, Nicolas F, University of Strasbourg
local.contributor.affiliationFerguson, Annette, University of Edinburgh
local.contributor.affiliationCollins, Michelle M. L., University of Surrey
local.contributor.affiliationGwyn, Stephen, Dominion Astrophysical Observatory
local.contributor.affiliationIrwin, Mike, Cambridge University
local.contributor.affiliationLewis, Geraint Francis, University of Sydney
local.contributor.affiliationMackey, Dougal, College of Science, ANU
local.contributor.affiliationDavidge, Tim, Dominion Astrophysical Observatory
local.contributor.affiliationArias, Veronica, Universidad de los Andes
local.contributor.affiliationTanvir, Nial R, University of Leicester
local.contributor.affiliationBabul, Arif, University of Victoria
local.contributor.affiliationBate, Nicholas F, University of Sydney
local.contributor.affiliationDotter, Aaron, College of Science, ANU
local.contributor.affiliationNavarro, J F, University of Victoria
local.contributor.affiliationPuzia, Thomas H, Pontificia Universidade Catlica de Chile
local.contributor.affiliationWidrow, L. M., Queen's University
local.description.embargo2099-12-31
local.bibliographicCitation.issue55
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage36
local.identifier.doi10.3847/1538-4357/aae8e7
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2020-11-23T11:57:48Z
local.identifier.scopusID2-s2.0-85057219721
CollectionsANU Research Publications

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