On the Nature of Ultra-faint Dwarf Galaxy Candidates. I. DES1, Eridanus III, and Tucana V
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Conn, Blair; Jerjen, Helmut; Kim, Dongwon; Schirmer, Mischa
Description
We use deep Gemini/GMOS-S g, r photometry to study the three ultra-faint dwarf galaxy candidates DES1, Eridanus III (Eri III), and Tucana V (Tuc V). Their total luminosities, M V(DES1) = -1.42 ±0.50 and MV(Eri III) = -2.07 ±0.50, and mean metallicities, [Fe/H] = -2.38+0.21-0.19 and [Fe/H] = -2.40+0.19-0.12, are consistent with them being ultra-faint dwarf galaxies, as they fall just outside the 1σ confidence band of the luminosity-metallicity relation for Milky Way satellite galaxies. However,...[Show more]
dc.contributor.author | Conn, Blair | |
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dc.contributor.author | Jerjen, Helmut | |
dc.contributor.author | Kim, Dongwon | |
dc.contributor.author | Schirmer, Mischa | |
dc.date.accessioned | 2021-04-29T23:34:18Z | |
dc.date.available | 2021-04-29T23:34:18Z | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/231145 | |
dc.description.abstract | We use deep Gemini/GMOS-S g, r photometry to study the three ultra-faint dwarf galaxy candidates DES1, Eridanus III (Eri III), and Tucana V (Tuc V). Their total luminosities, M V(DES1) = -1.42 ±0.50 and MV(Eri III) = -2.07 ±0.50, and mean metallicities, [Fe/H] = -2.38+0.21-0.19 and [Fe/H] = -2.40+0.19-0.12, are consistent with them being ultra-faint dwarf galaxies, as they fall just outside the 1σ confidence band of the luminosity-metallicity relation for Milky Way satellite galaxies. However, their positions in the size-luminosity relation suggest that they are star clusters. Interestingly, DES1 and Eri III are at relatively large Galactocentric distances, with DES1 located at DGC = 74 ± 4 kpc and Eri III at DGC = 91 ± 4 kpc. In projection, both objects are in the tail of gaseous filaments trailing the Magellanic Clouds and have similar 3D separations from the Small Magellanic Cloud (SMC): δDSMC,DES1 = 31.7 kpc and δDSMC,Eri III = 41.0 kpc, respectively. It is plausible that these stellar systems are metal-poor SMC satellites. Tuc V represents an interesting phenomenon in its own right. Our deep photometry at the nominal position of Tuc V reveals a low-level excess of stars at various locations across the GMOS field without a well-defined center. An SMC Northern Overdensity-like isochrone would be an adequate match to the Tuc V color-magnitude diagram, and the proximity to the SMC (12.°1; δDSMC,Tuc V = 13 kpc) suggests that Tuc V is either a chance grouping of stars related to the SMC halo or a star cluster in an advanced stage of dissolution. | |
dc.description.sponsorship | BCC and HJ acknowledge the support of the Australian Research Council through Discovery project DP150100862. | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | IOP Publishing | |
dc.rights | © 2018 The American Astronomical Society | |
dc.source | The Astrophysical Journal | |
dc.title | On the Nature of Ultra-faint Dwarf Galaxy Candidates. I. DES1, Eridanus III, and Tucana V | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 852 | |
dcterms.dateAccepted | 2017-11-29 | |
dc.date.issued | 2018-01-08 | |
local.identifier.absfor | 020104 - Galactic Astronomy | |
local.identifier.ariespublication | a383154xPUB9286 | |
local.publisher.url | https://iopscience.iop.org/ | |
local.type.status | Accepted Version | |
local.contributor.affiliation | Conn, Blair, College of Science, ANU | |
local.contributor.affiliation | Jerjen, Helmut, College of Science, ANU | |
local.contributor.affiliation | Kim, Dongwon, College of Science, ANU | |
local.contributor.affiliation | Schirmer, Mischa, Gemini Observatory | |
dc.relation | http://purl.org/au-research/grants/arc/DP150100862 | |
local.bibliographicCitation.issue | 68 | |
local.bibliographicCitation.startpage | 1 | |
local.bibliographicCitation.lastpage | 19 | |
local.identifier.doi | 10.3847/1538-4357/aa9eda | |
dc.date.updated | 2020-11-23T11:50:13Z | |
local.identifier.scopusID | 2-s2.0-85040687696 | |
dcterms.accessRights | Open Access | |
dc.provenance | https://v2.sherpa.ac.uk/id/publication/6401..."Author accepted manuscript can be made open access on non-commercial institutional repository after 12 month embargo" from SHERPA/RoMEO site (as at 30.4.2021) | |
Collections | ANU Research Publications |
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File | Description | Size | Format | Image |
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1712.01439.pdf | Author Accepted Manuscript | 13.13 MB | Adobe PDF |
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