Extra-tidal structures around the <i>Gaia Sausage</i> candidate globular cluster NGC6779 (M56)

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dc.contributor.authorPiatti, Andres E.
dc.contributor.authorCarballo-Bello, Julio A.
dc.date.accessioned2025-01-23T21:16:06Z
dc.date.available2025-01-23T21:16:06Z
dc.date.issued2019
dc.description.abstractWe present results on the stellar density radial profile of the outer regions of NGC6779, a Milky Way globular cluster recently proposed as a candidate member of the Gaia Sausage structure, a merger remnant of a massive dwarf galaxy with the Milky Way. Taking advantage of the Pan-STARRS PS1 public astrometric and photometric catalogue, we built the radial profile for the outermost cluster regions using horizontal branch and main-sequence stars, separately, in order to probe for different profile trends because of difference stellar masses. Owing to its relatively close location to the Galactic plane, we have carefully treated the chosen colour-magnitude regions properly correcting them by the amount of interstellar extinction measured along the line of side of each star, as well as cleaned them from the variable field star contamination observed across the cluster field. In the region spanning from the tidal to the Jacobi radii, the resulting radial profiles show a diffuse extended halo with an average power-law slope of -1. While analysing the relationships between the Galactocentric distance, the half-mass density, the half-light radius, the slope of the radial profile of the outermost regions, the internal dynamical evolutionary stage, among others, we found that NGC6779 shows structural properties similar to those of the remaining Gaia Sausage candidate globular clusters, namely, they are massive clusters (>10(5) M-circle dot) in a moderately early dynamical evolutionary stage, with observed extra-tidal structures.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stz500
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stz500
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101112
dc.identifier.wosidWOS:000466786400071
dc.issue.numero1
dc.language.isoen
dc.pagina.final1035
dc.pagina.inicio1029
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjecttechniques: photometric
dc.subjectglobular clusters: individual: NGC6779
dc.subject.ods09 Industry, innovation and infrastructure
dc.subject.odspa09 Industria, innovación e infraestructura
dc.titleExtra-tidal structures around the <i>Gaia Sausage</i> candidate globular cluster NGC6779 (M56)
dc.typeartículo
dc.volumen485
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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