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The remnants of galaxy formation from a panoramic survey of the region around M31

McConnachie, Alan W; Irwin, M. J.; Ibata, Rodrigo A; Dubinski, John; Widrow, L. M.; Martin, N F; Cote, P; Dotter, Aaron; Navarro, J F; Ferguson, A. M. N.; Fardal, Mark; Mackey, Alasdair

Description

In hierarchical cosmological models, galaxies grow in mass through the continual accretion of smaller ones. The tidal disruption of these systems is expected to result in loosely bound stars surrounding the galaxy, at distances that reach 10-100 times the radius of the central disk. The number, luminosity and morphology of the relics of this process provide significant clues to galaxy formation history, but obtaining a comprehensive survey of these components is difficult because of their...[Show more]

dc.contributor.authorMcConnachie, Alan W
dc.contributor.authorIrwin, M. J.
dc.contributor.authorIbata, Rodrigo A
dc.contributor.authorDubinski, John
dc.contributor.authorWidrow, L. M.
dc.contributor.authorMartin, N F
dc.contributor.authorCote, P
dc.contributor.authorDotter, Aaron
dc.contributor.authorNavarro, J F
dc.contributor.authorFerguson, A. M. N.
dc.contributor.authorFardal, Mark
dc.contributor.authorMackey, Alasdair
dc.date.accessioned2015-12-13T22:48:30Z
dc.identifier.issn0028-0836
dc.identifier.urihttp://hdl.handle.net/1885/80126
dc.description.abstractIn hierarchical cosmological models, galaxies grow in mass through the continual accretion of smaller ones. The tidal disruption of these systems is expected to result in loosely bound stars surrounding the galaxy, at distances that reach 10-100 times the radius of the central disk. The number, luminosity and morphology of the relics of this process provide significant clues to galaxy formation history, but obtaining a comprehensive survey of these components is difficult because of their intrinsic faintness and vast extent. Here we report a panoramic survey of the Andromeda galaxy (M31). We detect stars and coherent structures that are almost certainly remnants of dwarf galaxies destroyed by the tidal field of M31. An improved census of their surviving counterparts implies that three-quarters of M31?s satellites brighter than Mv =-6 await discovery. The brightest companion, Triangulum (M33), is surrounded by a stellar structure that provides persuasive evidence for a recent encounter with M31. This panorama of galaxy structure directly confirms the basic tenets of the hierarchical galaxy formation model and reveals the shared history of M31 and M33 in the unceasing build-up of galaxies.
dc.publisherMacmillan Publishers Ltd
dc.sourceNature
dc.subjectKeywords: cosmochemistry; modeling; survey; article; astronomy; cosmological phenomena; luminance; priority journal; telecommunication; Andromeda
dc.titleThe remnants of galaxy formation from a panoramic survey of the region around M31
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume461
dc.date.issued2009
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationf5625xPUB8445
local.type.statusPublished Version
local.contributor.affiliationMcConnachie, Alan W, NRC Herzberg Institute of Astrophysics
local.contributor.affiliationIrwin, M. J., University of Cambridge
local.contributor.affiliationIbata, Rodrigo A, Universite de Strasbourg
local.contributor.affiliationDubinski, John, University of Toronto
local.contributor.affiliationWidrow, L. M., Queen's University
local.contributor.affiliationMartin, N F, Max-Planck-Institut für Astronomie
local.contributor.affiliationCote, P, NRC Herzberg Institute of Astrophysics
local.contributor.affiliationDotter, Aaron, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationNavarro, J F, University of Victoria
local.contributor.affiliationFerguson, A. M. N., University of Edinburgh
local.contributor.affiliationFardal, Mark, University of Massachusetts
local.contributor.affiliationMackey, Alasdair, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue7260
local.bibliographicCitation.startpage66
local.bibliographicCitation.lastpage69
local.identifier.doi10.1038/nature08327
dc.date.updated2016-02-24T09:41:58Z
local.identifier.scopusID2-s2.0-69949105175
CollectionsANU Research Publications

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