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dc.contributor.authorMyeong, Gyuchulen
dc.contributor.authorEvans, Wynen
dc.contributor.authorBelokurov, Vasilyen
dc.contributor.authorKoposov, Sen
dc.contributor.authorSanders, Jasonen
dc.date.accessioned2017-08-03T14:09:24Z
dc.date.available2017-08-03T14:09:24Z
dc.date.issued2017-07-21en
dc.identifier.issn1745-3925
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/265886
dc.description.abstractWe identify a halo substructure in the Tycho Gaia Astrometric Solution (TGAS) data set, cross-matched with the Radial Velocity Experiment (RAVE-on) data release. After quality cuts, the stars with large radial action (JR > 800 km s−1 kpc) are extracted. A subset of these stars is clustered in longitude and velocity and can be selected with further cuts. The 14 stars are centred on (X, Y, Z) ≈ (9.0, −1.0, −0.6) kpc and form a coherently moving structure in the halo with median (vR, vϕ, vz) = (167.33, 0.86, −94.85) km s−1. They are all metal-poor giants with median [Fe/H] = −0.83. To guard against the effects of distance errors, we compute spectrophotometric distances for 8 out of the 14 stars where this is possible. We find that six of the stars are still comoving. These six stars also have a much tighter [Fe/H] distribution ∼−0.7 with one exception ([Fe/H] = −2.12). We conclude that the existence of the comoving cluster is stable against changes in distance estimation and conjecture that this is the dissolving remnant of a globular cluster accreted long ago.
dc.description.sponsorshipGCM thanks the Boustany Foundation, Cambridge Commonwealth, European & International Trust, and Issac Newton Studentship for their support on his work. SEK thanks the United Kingdom Science and Technology Council (STFC) for the award of an Ernest Rutherford fellowship (grant number ST/N004493/1).
dc.language.isoenen
dc.publisherOxford University Press
dc.subjectgalaxies: kinematics and dynamicsen
dc.subjectgalaxies: structureen
dc.titleA Halo Substructure in Gaia Data Release 1en
dc.typeArticle
prism.endingPageL82
prism.issueIdentifier1en
prism.publicationDate2017en
prism.publicationNameMonthly Notices of the Royal Astronomical Society: Lettersen
prism.startingPageL78
prism.volume469en
dc.identifier.doi10.17863/CAM.12261
dcterms.dateAccepted2017-04-04en
rioxxterms.versionofrecord10.1093/mnrasl/slx051en
rioxxterms.versionVoRen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-07-21en
dc.contributor.orcidMyeong, Gyuchul [0000-0002-5629-8876]
dc.contributor.orcidEvans, Wyn [0000-0002-5981-7360]
dc.contributor.orcidBelokurov, Vasily [0000-0002-0038-9584]
dc.contributor.orcidSanders, Jason [0000-0003-4593-6788]
dc.identifier.eissn1745-3933
dc.publisher.urlhttp://dx.doi.org/10.1093/mnrasl/slx051en
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idSCIENCE & TECHNOLOGY FACILITIES COUNCIL (ST/N000927/1)
pubs.funder-project-idSCIENCE & TECHNOLOGY FACILITIES COUNCIL (ST/N004493/1)
cam.issuedOnline2017-04-10en


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