IAR   05382
INSTITUTO ARGENTINO DE RADIOASTRONOMIA
Unidad Ejecutora - UE
artículos
Título:
XMM-Newton observations of NGC 3268 in the Antlia Galaxy Cluster: characterization of a hidden group of galaxies at z ~0.41
Autor/es:
COMBI, J. A.; GARGIULO, I. D.; CASO, J. P.; GARGIULO, I. D.; CASO, J. P.; GARCÍA, F.; BASSINO, L. P.; GARCÍA, F.; BASSINO, L. P.; COMBI, J. A.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2018 vol. 479 p. 240 - 250
ISSN:
0035-8711
Resumen:
We report on a detailed X-ray study of the extended emission of the intracluster medium (ICM) around NGC 3268, in the Antlia cluster of galaxies, together with a characterization of an extended source in the field, namely a background cluster of galaxies at z ~ 0.41, which was previously accounted as an X-ray point source. The spectral properties of the extended emission of the gas present in Antlia were studied using data from the XMM-Newton satellite complemented with optical images of CTIO-Blanco telescope, to attain for associations of the optical sources with the X-ray emission. The XMM-Newton observations show that the intracluster gas is concentrated in a region centred in one of the main galaxies of the cluster, NGC 3268. By means of a spatially-resolved spectral analysis we derived the abundances of the ICM plasma. We found a wall-like feature in the northeast direction where the gas is characterized by a lower temperature with respect to the rest of the ICM. Furthermore, using combined optical observations we inferred the presence of an elliptical galaxy in the centre of the extended X-ray source considered as a background cluster, which favours this interpretation.