Formation of an ultra-diffuse galaxy in the stellar filaments of NGC 3314A: Caught in the act?

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dc.contributor.authorIodice, Enrichetta
dc.contributor.authorLa Marca, Antonio
dc.contributor.authorHilker, Michael
dc.contributor.authorCantiello, Michele
dc.contributor.authorD'Ago, Giuseppe
dc.contributor.authorGullieuszik, Marco
dc.contributor.authorRejkuba, Marina
dc.contributor.authorArnaboldi, Magda
dc.contributor.authorSpavone, Marilena
dc.contributor.authorSpiniello, Chiara
dc.contributor.authorForbes, Duncan A.
dc.contributor.authorGreggio, Laura
dc.contributor.authorRampazzo, Roberto
dc.contributor.authorMieske, Steffen
dc.contributor.authorPaolillo, Maurizio
dc.contributor.authorSchipani, Pietro
dc.date.accessioned2025-01-20T22:09:41Z
dc.date.available2025-01-20T22:09:41Z
dc.date.issued2021
dc.description.abstractThe VEGAS imaging survey of the Hydra I cluster has revealed an extended network of stellar filaments to the south-west of the spiral galaxy NGC 3314A. Within these filaments, at a projected distance of similar to 40 kpc from the galaxy, we discover an ultra-diffuse galaxy (UDG) with a central surface brightness of mu(0,g) similar to 26 mag arcsec(-2) and effective radius R-e similar to 3.8 kpc. This UDG, named UDG 32, is one of the faintest and most diffuse low-surface-brightness galaxies in the Hydra I cluster. Based on the available data, we cannot exclude that this object is just seen in projection on top of the stellar filaments and is thus instead a foreground or background UDG in the cluster. However, the clear spatial coincidence of UDG 32 with the stellar filaments of NGC 3314A suggests that it might have formed from the material in the filaments, becoming a detached, gravitationally bound system. In this scenario, the origin of UDG 32 depends on the nature of the stellar filaments in NGC 3314A, which is still unknown. The stellar filaments could result from ram-pressure stripping or have a tidal origin. In this letter we focus on the comparison of the observed properties of the stellar filaments and of UDG 32 and speculate on their possible origin. The relatively red colour (g - r=0.54 +/- 0.14 mag) of the UDG, similar to that of the disk in NGC 3314A, combined with an age older than 1 Gyr and the possible presence of a few compact stellar systems, points towards a tidal formation scenario.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202141086
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202141086
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94342
dc.identifier.wosidWOS:000686300800008
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectgalaxies: dwarf
dc.subjectgalaxies: clusters: individual: Hydra I
dc.subjectgalaxies: formation
dc.subjectgalaxies: photometry
dc.titleFormation of an ultra-diffuse galaxy in the stellar filaments of NGC 3314A: Caught in the act?
dc.typeartículo
dc.volumen652
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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