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dc.contributor.authorCrnojević, Denija
dc.contributor.authorSand, David J.
dc.contributor.authorZaritsky, Dennis
dc.contributor.authorSpekkens, K.
dc.contributor.authorWillman, B.
dc.contributor.authorHargis, J. R.
dc.date.accessioned2016-11-03T20:35:37Z
dc.date.available2016-11-03T20:35:37Z
dc.date.issued2016-06-08
dc.identifier.citationDEEP IMAGING OF ERIDANUS II AND ITS LONE STAR CLUSTER 2016, 824 (1):L14 The Astrophysical Journal Lettersen
dc.identifier.issn2041-8213
dc.identifier.doi10.3847/2041-8205/824/1/L14
dc.identifier.urihttp://hdl.handle.net/10150/621260
dc.description.abstractWe present deep imaging of the most distant dwarf discovered by the Dark Energy Survey, Eridanus II (Eri II). Our Magellan/ Megacam stellar photometry reaches similar to 3 mag deeper than previous work and allows us to confirm the presence of a stellar cluster whose position is consistent with Eri II's center. This makes Eri II, at M-V = -7.1, the least luminous galaxy known to host a (possibly central) cluster. The cluster is partially resolved, and at MV = -3.5 it accounts for similar to 4% of Eri II's luminosity. We derive updated structural parameters for Eri II, which has a half-light radius of similar to 280 pc and is elongated (epsilon similar to 0.48) at a measured distance of D similar to 370 kpc. The color-magnitude diagram displays a blue, extended horizontal branch, as well as a less populated red horizontal branch. A central concentration of stars brighter than the old main-sequence turnoff hints at a possible intermediate-age (similar to 3 Gyr) population; alternatively, these sources could be blue straggler stars. A deep Green Bank Telescope observation of Eri II reveals no associated atomic gas.
dc.description.sponsorshipNSF [AST-1412504, AST-1311326, AST-1151462]; Smithsonian Astro-physical Observatoryen
dc.language.isoenen
dc.publisherIOP PUBLISHING LTDen
dc.relation.urlhttp://stacks.iop.org/2041-8205/824/i=1/a=L14?key=crossref.f787c50a6e5fb050a72f60faa6aeb1caen
dc.rights© 2016. The American Astronomical Society. All rights reserved.en
dc.subjectgalaxies: dwarfen
dc.subjectgalaxies: individual (Eridanus II)en
dc.subjectgalaxies: photometryen
dc.subjectgalaxies: stellar contenten
dc.titleDEEP IMAGING OF ERIDANUS II AND ITS LONE STAR CLUSTERen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Steward Observen
dc.identifier.journalThe Astrophysical Journal Lettersen
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
dc.internal.reviewer-noteAmanda.en
refterms.dateFOA2018-06-25T01:08:06Z
html.description.abstractWe present deep imaging of the most distant dwarf discovered by the Dark Energy Survey, Eridanus II (Eri II). Our Magellan/ Megacam stellar photometry reaches similar to 3 mag deeper than previous work and allows us to confirm the presence of a stellar cluster whose position is consistent with Eri II's center. This makes Eri II, at M-V = -7.1, the least luminous galaxy known to host a (possibly central) cluster. The cluster is partially resolved, and at MV = -3.5 it accounts for similar to 4% of Eri II's luminosity. We derive updated structural parameters for Eri II, which has a half-light radius of similar to 280 pc and is elongated (epsilon similar to 0.48) at a measured distance of D similar to 370 kpc. The color-magnitude diagram displays a blue, extended horizontal branch, as well as a less populated red horizontal branch. A central concentration of stars brighter than the old main-sequence turnoff hints at a possible intermediate-age (similar to 3 Gyr) population; alternatively, these sources could be blue straggler stars. A deep Green Bank Telescope observation of Eri II reveals no associated atomic gas.


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