The First Galaxy Cluster Discovered by the VISTA Variables in the Via Lactea Survey

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dc.contributor.authorBaravalle, L. D.
dc.contributor.authorNilo Castellon, J. L.
dc.contributor.authorAlonso, M., V
dc.contributor.authorDiaz Tello, J.
dc.contributor.authorDamke, G.
dc.contributor.authorValottol, C.
dc.contributor.authorCuevas Larenas, H.
dc.contributor.authorSanchez, B.
dc.contributor.authorde los Rios, M.
dc.contributor.authorMinniti, D.
dc.contributor.authorDominguez, M.
dc.contributor.authorGurovich, S.
dc.contributor.authorBarba, R.
dc.contributor.authorSoto, M.
dc.contributor.authorMilla Castro, F.
dc.date.accessioned2025-01-23T21:16:57Z
dc.date.available2025-01-23T21:16:57Z
dc.date.issued2019
dc.description.abstractWe report the first confirmed detection of the galaxy cluster VVV-J144321-611754 at very low latitudes (l = 315 degrees.836, b = -1 degrees.650) located in the tile d015 of the VISTA Variables in the Via Lactea (VVV) survey. We defined the region of 30 x 30 arcmin(2) centered in the brightest galaxy finding 25 galaxies. For these objects, extinction-corrected median colors of (H-K-s) = 0.34 +/- 0.05 mag, (J-H) = 0.57 +/- 0.08 mag, and (J-K-s) = 0.87 +/- 0.06 mag; R-1/2 = 1.59 +/- 0 16; C = 3.01 +/- 0.08; and Sersic index n = 4.63 +/- 0.39 were estimated. They were visually confirmed showing characteristics of early-type galaxies in the near-IR images. An automatic clustering analysis performed in the whole tile found that the concentration of galaxies VVV-J144321-611754 is a real, compact concentration of early-type galaxies. Assuming a typical galaxy cluster with low X-ray luminosity, the photometric redshift of the brightest galaxy is z = 0.196 +/- 0.025. Follow-up near-IR spectroscopy with FLAMINGOS-2 at the Gemini-South telescope revealed that the two brighter cluster galaxies have typical spectra of early-type galaxies and the estimated redshift for the brightest galaxy VVV-J144321.06-611753.9 is z = 0.234 +/- 0.022 and that for VVV-J144319.02-611746.1 is z = 0.232 +/- 0.019. Finally, these galaxies clearly follow the cluster red sequence in the rest-frame near-IR color-magnitude diagram with a slope similar to a galaxy cluster at a redshift of 0.2. These results are consistent with the presence of a bona fide galaxy cluster beyond the Milky Way disk.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/aaff64
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/aaff64
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101139
dc.identifier.wosidWOS:000462047700004
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectgalaxies: clusters: general
dc.subjectsurveys
dc.subjectinfrared: galaxies
dc.titleThe First Galaxy Cluster Discovered by the VISTA Variables in the Via Lactea Survey
dc.typeartículo
dc.volumen874
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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