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The trail of discrete X-ray sources in the early-type galaxy NGC 4261: anisotropy in the globular cluster distribution

Published online by Cambridge University Press:  12 May 2006

Ginevra Trinchieri
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20121 Milano, Italy
Lea Giordano
Affiliation:
Università degli Studi di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
Luca Cortese
Affiliation:
Università degli Studi di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
Anna Wolter
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20121 Milano, Italy
Monica Colpi
Affiliation:
Università degli Studi di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
Giuseppe Gavazzi
Affiliation:
Università degli Studi di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
Lucio Mayer
Affiliation:
Inst. of Theoretical Physics, University of Zürich, Winterurestr. 190, 8057 Zürich, Switzerland
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Abstract

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The recent evidence of a peculiar distribution of X-ray sources in the elliptical galaxy NGC 4261 reported by Zezas et al. has prompted us to study this galaxy combining archive X-ray and optical observations, from Chandra, INT, and HST. We find that a sizable fraction of the X-ray sources has a globular cluster as optical counterpart. This together with the shape of the luminosity function of the X-ray sources suggest that they are accreting low-mass binaries. We further show a remarkable similarity in the anisotropy of the projected spatial distributions of the optical and X-ray sources, which leads us to conclude that the spatial anisotropy of the X-ray sources in NGC 4261 is due to the anisotropy of the globular cluster population.

Type
Contributed Papers
Copyright
2006 International Astronomical Union