Galaxy populations in the Hydra I cluster from the VEGAS survey II. The ultra-diffuse galaxy population

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dc.contributor.authorLa Marca, Antonio
dc.contributor.authorIodice, Enrichetta
dc.contributor.authorCantiello, Michele
dc.contributor.authorForbes, Duncan A.
dc.contributor.authorRejkuba, Marina
dc.contributor.authorHilker, Michael
dc.contributor.authorArnaboldi, Magda
dc.contributor.authorGreggio, Laura
dc.contributor.authorSpiniello, Chiara
dc.contributor.authorMieske, Steffen
dc.contributor.authorVenhola, Aku
dc.contributor.authorSpavone, Marilena
dc.contributor.authorD'Ago, Giuseppe
dc.contributor.authorRaj, Maria Angela
dc.contributor.authorRagusa, Rossella
dc.contributor.authorMirabile, Marco
dc.contributor.authorRampazzo, Roberto
dc.contributor.authorPeletier, Reynier
dc.contributor.authorPaolillo, Maurizio
dc.contributor.authorChallapa, Nelvy Choque
dc.contributor.authorSchipani, Pietro
dc.date.accessioned2025-01-20T21:02:33Z
dc.date.available2025-01-20T21:02:33Z
dc.date.issued2022
dc.description.abstractIn this work, we extend the catalog of low-surface brightness (LSB) galaxies, including ultra-diffuse galaxy (UDG) candidates, within approximate to 0.4R(vir) of the Hydra I cluster of galaxies based on deep images from the VST Early-type GAlaxy Survey (VEGAS). The new galaxies were found by applying an automatic detection tool and carrying out additional visual inspections of g and r band images. This led to the detection of 11 UDGs and 8 more LSB galaxies. For all of them, we assessed the cluster membership using the color-magnitude relation derived for early-type giant and dwarf galaxies in Hydra I. The UDGs and new LSB galaxies found in Hydra I span a wide range of central surface brightness (22.7 less than or similar to mu(0.g) less than or similar to 26.5 mag arcse(-2)), effective radius (0.6 less than or similar to R-e less than or similar to 4.0 kpc), and color (0.4 <= g-r <= 0.9 mag), and have stellar masses in the range similar to 5 x 10(6)-2 x 10(8) M-circle dot. The 2D projected distribution of both galaxy types is similar to the spatial distribution of dwarf galaxies, with over-densities in the cluster core and north of the cluster center. They have similar color distribution and comparable stellar masses to the red dwarf galaxies. Based on photometric selection, we identify a total of nine globular cluster (GC) candidates associated to the UDGs and four to the LSB galaxies, with the highest number of candidates in an individual UDG being three. We find that there are no relevant differences between dwarfs, LSB galaxies, and UDGs: the structural parameters (i.e., surface brightness, size, color, and n-index) and GC content of the three classes have similar properties and trends. This finding is consistent with UDGs being the extreme LSB tail of the size-luminosity distribution of dwarfs in this environment.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202142367
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202142367
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93053
dc.identifier.wosidWOS:000853947200011
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectgalaxies: clusters: individual: Hydra I
dc.subjectgalaxies: photometry
dc.subjectgalaxies: dwarf
dc.subjectgalaxies: formation galaxies: evolution
dc.titleGalaxy populations in the Hydra I cluster from the VEGAS survey II. The ultra-diffuse galaxy population
dc.typeartículo
dc.volumen665
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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