XMM-Newton Spectroscopy of Bright ULX Sources in the Antennae Galaxies NGC 4038-4039Reportar como inadecuado



 XMM-Newton Spectroscopy of Bright ULX Sources in the Antennae Galaxies NGC 4038-4039


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We report the results of spectral fits to four bright ultra-luminous X-ray sources ULXs in the Antennae galaxies NGC 4038-4039 observed for 41 ksec with XMM-Newton. Although emission regions are not resolved as well as in prior Chandra observations, at least four ULXs X-11, X-16, X-37, and X-44 in the Zezas and Fabbiano scheme are sufficiently bright and well-separated with XMM-Newton that reliable extractions and spectral analyses are possible. We find that the single component multi-color disk blackbody models cannot describe any of the spectra. Sources X-11 and X-16 are acceptably fit with simple power-law models. A thermal bremsstrahlung model provides a better fit to the spectrum of X-44. Including a disk blackbody component to the spectrum of X-37 improves the fit and reveals an apparently cool disk kT = 0.13 +- 0.02 keV. This would suggest a parallel to cool disks recently found in other very luminous ULXs, which may contain intermediate mass black holes; however, the complex diffuse emission of the Antennae demands this finding be regarded cautiously.



Autor: J. M. Miller; A. Zezas; G. Fabbiano; F. Schweizer

Fuente: https://archive.org/



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