Confirmation of a galaxy cluster hidden behind the Galactic bulge using the VVV survey
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Fecha
2014-09
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
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Título del volumen
Editor
EDP Sciences
Nombre de Curso
Licencia CC
Atribution 4.0 International (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
Context. S uzaku and Chandra X-ray observations detected a new cluster of galaxies, Suzaku J1759−3450, at a redshift z = 0.13. It
is located behind the Milky Way, and the high Galactic dust extinction renders it nearly invisible at optical wavelengths.
Aims. We attempt here to confirm the galaxy cluster with near-infrared imaging observations and to characterize its central member
galaxies.
Methods. Images from the VVV survey were used to detect candidate member galaxies of Suzaku J1759−3450 within the central
region of the cluster up to 350 kpc from the X-ray peak emission. Color–magnitude diagrams, color–color diagrams, and morphology
criteria allowed us to select the galaxies among the numerous foreground sources.
Results. Fifteen candidate cluster members were found very close to a modeled red-sequence at the redshift of the cluster. Five
members are extremely bright, and one is possibly a cD galaxy. The asymmetry in the spatial distribution of the galaxies with respect
to the X-ray peak emission is an indicator that this cluster is still suffering a virialization process.
Conclusions. Our investigation of Suzaku J1759−3450 demonstrates the potential of the VVV survey to study the hidden population
of galaxies in the zone of avoidance.
Notas
Indexación: Scopus.
Palabras clave
Surveys, Galaxy: Bulge, Galaxies: clusters: Individual: Suzaku J1759–3450
Citación
Astronomy and Astrophysics. Volume 569. September 2014. Article number A49
DOI
10.1051/0004-6361/201423464