The extended structure of the dwarf irregular galaxy Sagittarius

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dc.contributor.authorBeccari, G.
dc.contributor.authorBellazzini, M.
dc.contributor.authorFraternali, F.
dc.contributor.authorBattaglia, G.
dc.contributor.authorPerina, S.
dc.contributor.authorSollima, A.
dc.contributor.authorOosterloo, T. A.
dc.contributor.authorTesta, V.
dc.contributor.authorGalleti, S.
dc.date.accessioned2025-01-23T21:41:25Z
dc.date.available2025-01-23T21:41:25Z
dc.date.issued2014
dc.description.abstractWe present a detailed study of the stellar and H I structure of the dwarf irregular galaxy Sagittarius. We use new deep and wide field photometry to trace the surface brightness profile of the galaxy out to similar or equal to 5.0' (corresponding to similar or equal to 1600 pc) and down to mu V similar or equal to 30.0 mag/arcsec(2), thus showing that the stellar body of the galaxy is much more extended than previously believed, and it is similarly (or more) extended than the overall H i distribution. The whole major-axis profile is consistent with a pure exponential, with a scale radius of similar or equal to 340 pc. The surface density maps reveal that the distribution of old and intermediate-age stars is smooth and remarkably flattened out to its edges, while the associated H I has a much rounder shape, is off-centred and presents multiple density maxima and a significant hole. No clear sign of systemic rotation is detectable in the complex H i velocity field. No metallicity gradient is detected in the old and intermediate age population of the galaxy, and we confirm that this population has a much more extended distribution than young stars (age less than or similar to 1 Gyr).
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/201424411
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201424411
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101640
dc.identifier.wosidWOS:000344158500113
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectgalaxies: dwarf
dc.subjectLocal Group
dc.subjectgalaxies: ISM
dc.titleThe extended structure of the dwarf irregular galaxy Sagittarius
dc.typeartículo
dc.volumen570
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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