The ultraluminous X-ray sources in the high-velocity system of NGC 1275 |
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| Authors: | O González-Martín A C Fabian J S Sanders |
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| Institution: | Instituto de Astrofísica de Andalucía (CSIC), Apdo 3004, 18080 Granada, Spain;Institute of Astronomy, Madingley Road, Cambridge CB3 0HA |
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| Abstract: | We report the results of a study of X-ray point sources coincident with the high-velocity system (HVS) projected in front of NGC 1275. 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 L X(0.5 ? 7.0 keV) > 7 × 1039 erg s-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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| Keywords: | galaxies: clusters: individual: Perseus galaxies: individual: NGC 1275 |
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