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Title:
The ultraluminous X-ray sources in the high-velocity system of NGC1275
Authors:
González-Martín, O.; Fabian, A. C.; Sanders, J. S.
Affiliation:
AA(Instituto de Astrofísica de Andalucía (CSIC), Apdo 3004, 18080 Granada, Spain; Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AC(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 367, Issue 3, pp. 1132-1138. (MNRAS Homepage)
Publication Date:
04/2006
Origin:
MNRAS
MNRAS Keywords:
galaxies: clusters: individual: Perseus, galaxies: individual: NGC1275
DOI:
10.1111/j.1365-2966.2006.10034.x
Bibliographic Code:
2006MNRAS.367.1132G

Abstract

We report the results of a study of X-ray point sources coincident with the high-velocity system (HVS) projected in front of NGC1275. A very deep X-ray image of the core of the Perseus cluster, made with the Chandra X-ray Observatory, has been used. We find a population of ultraluminous X-ray sources [ULXs seven sources with LX(0.5 - 7.0 keV) > 7 × 1039ergs-1]. As with the ULX populations in the Antennae and Cartwheel galaxies, those in the HVS are associated with a region of very active star formation. Several sources have possible optical counterparts found on the Hubble Space Telescope (HST) images, although the X-ray brightest one does not. Absorbed power-law models fit the X-ray spectra, with most having a photon index between 2 and 3.

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