A Rogues' Gallery of Andromeda's Dwarf Galaxies. I. A Predominance of Red Horizontal Branches

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dc.contributor.authorMartin, Nicolas F.
dc.contributor.authorWeisz, Daniel R.
dc.contributor.authorAlbers, Saundra M.
dc.contributor.authorBernard, Edouard
dc.contributor.authorCollins, Michelle L. M.
dc.contributor.authorDolphin, Andrew E.
dc.contributor.authorFerguson, Annette M. N.
dc.contributor.authorIbata, Rodrigo A.
dc.contributor.authorLaevens, Benjamin
dc.contributor.authorLewis, Geraint F.
dc.contributor.authorMackey, A. Dougal
dc.contributor.authorMcConnachie, Alan
dc.contributor.authorRich, R. Michael
dc.contributor.authorSkillman, Evan D.
dc.date.accessioned2024-01-10T13:46:04Z
dc.date.available2024-01-10T13:46:04Z
dc.date.issued2017
dc.description.abstractWe present homogeneous, sub-horizontal branch photometry of 20 dwarf spheroidal satellite galaxies of M31 observed with the Hubble Space Telescope. Combining our new data for 16 systems with archival data in the same filters for another four, we show that Andromeda dwarf spheroidal galaxies favor strikingly red horizontal branches or red clumps down to similar to 10(4.2) L-circle dot (M-V similar to -5.8). The age-sensitivity of horizontal branch stars implies that a large fraction of the M31 dwarf galaxies have extended star formation histories (SFHs), and appear inconsistent with early star formation episodes that were rapidly shutdown. Systems fainter than similar to 10(5.5) L-circle dot show the widest range in the ratios and morphologies of red and blue horizontal branches, indicative of both complex SFHs and a diversity in quenching timescales and/or mechanisms, which is qualitatively different from what is currently known for faint Milky Way (MW) satellites of comparable luminosities. Our findings bolster similar conclusions from recent deeper data for a handful of M31 dwarf galaxies. We discuss several sources for diversity of our data such as varying halo masses, patchy reionization, mergers/accretion, and the environmental influence of M31 and the Milky Way on the early evolution of their satellite populations. A detailed comparison between the histories of M31 and MW satellites would shed signifiant insight into the processes that drive the evolution of low-mass galaxies. Such a study will require imaging that reaches the oldest main-sequence turnoffs for a significant number of M31 companions.
dc.description.funderNASA
dc.description.funderNASA through Space Telescope Science Institute
dc.fechaingreso.objetodigital2024-05-30
dc.format.extent10 páginas
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/aa901a
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/aa901a
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79115
dc.identifier.wosidWOS:000415152100016
dc.information.autorucFísica;Laevens B ;S/I;1040234
dc.issue.numero1
dc.language.isoen
dc.nota.accesoContenido parcial
dc.publisherIOP PUBLISHING LTD
dc.revistaASTROPHYSICAL JOURNAL
dc.rightsacceso restringido
dc.subjectgalaxies: dwarf
dc.subjectgalaxies: evolution
dc.subjectgalaxies: photometry
dc.subjectLocal Group
dc.subjectSTAR-FORMATION HISTORIES
dc.subjectLOCAL GROUP
dc.subjectSPHEROIDAL COMPANIONS
dc.subjectWFPC2 OBSERVATIONS
dc.subjectMILKY-WAY
dc.subjectSATELLITE PROBLEM
dc.subjectREIONIZATION
dc.subjectM31
dc.subjectKINEMATICS
dc.subjectABUNDANCES
dc.titleA Rogues' Gallery of Andromeda's Dwarf Galaxies. I. A Predominance of Red Horizontal Branches
dc.typeartículo
dc.volumen850
sipa.codpersvinculados1040234
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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