Open AccessThe ultraluminous X‐ray sources in the high‐velocity system of NGC 1275
Author(s) -
GonzálezMartín O.,
Fabian A. C.,
Sanders J. S.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10034.x
Subject(s) - physics , astrophysics , observatory , galaxy , astronomy , x ray , hubble space telescope , population , optics , demography , sociology
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 × 10 39 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.