The First Galaxy Cluster Discovered by the VISTA Variables in the Vía Láctea Survey

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dc.contributor.authorBaravalle, L. D.
dc.contributor.authorNilo Castellón, J. L.
dc.contributor.authorAlonso, M. V.
dc.contributor.authorDíaz Tello, J.
dc.contributor.authorDamke, G.
dc.contributor.authorValotto, C.
dc.contributor.authorCuevas Larenas, H.
dc.contributor.authorSánchez, B.
dc.contributor.authorde los Ríos, M.
dc.contributor.authorMinniti, D.
dc.contributor.authorDomínguez, M.
dc.contributor.authorGurovich, S.
dc.contributor.authorBarbá, R.
dc.contributor.authorSoto, M.
dc.contributor.authorMilla Castro, F.
dc.date.accessioned2023-08-08T21:50:05Z
dc.date.available2023-08-08T21:50:05Z
dc.date.issued2019-03-20
dc.descriptionIndexación Scopuses
dc.description.abstractWe report the first confirmed detection of the galaxy cluster VVV-J144321-611754 at very low latitudes (l = 315.°836, b = -1.°650) located in the tile d015 of the VISTA Variables in the Vía Láctea (VVV) survey. We defined the region of 30 ×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 Sérsic 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.es
dc.identifier.citationAstrophysical Journal Volume 874, Issue 1 20 March 2019 Article number 46es
dc.identifier.doi10.3847/1538-4357/aaff64en
dc.identifier.issn0004-637X
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/52349
dc.language.isoenes
dc.publisherAstrophysical Journales
dc.rights.licenseAtribución 4.0 Internacional (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.esen
dc.subjectgalaxies: clusters: generales
dc.subjectinfrared: galaxieses
dc.subjectsurveyses
dc.titleThe First Galaxy Cluster Discovered by the VISTA Variables in the Vía Láctea Surveyes
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