INVESTIGADORES
ALONSO GIRALDES Maria Sol
artículos
Título:
Confirmation of a galaxy cluster hidden behind the Galactic bulge using the VVV survey
Autor/es:
COLDWELL, GEORGINA (1,2); ALONSO, SOL (1,2); DUPLANCIC, FERNANDA (1,2); HEMPEL, MAREN(3); IVANOV, VALENTIN D (3).; MINNITI, DANTE (3)
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2014 vol. 569 p. 1 - 7
ISSN:
0004-6361
Resumen:
Suzaku 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.