Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-25
Astrophys.J. 609 (2004) 728-734
Astronomy and Astrophysics
Astrophysics
10 pages, 6 color figures, ApJ accepted, uses special ApJ fonts
Scientific paper
10.1086/421098
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.
Fabbiano Giuseppina
Miller John Mcl.
Schweizer Francois
Zezas Andreas
No associations
LandOfFree
XMM-Newton Spectroscopy of Bright ULX Sources in the Antennae Galaxies (NGC 4038/4039) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with XMM-Newton Spectroscopy of Bright ULX Sources in the Antennae Galaxies (NGC 4038/4039), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and XMM-Newton Spectroscopy of Bright ULX Sources in the Antennae Galaxies (NGC 4038/4039) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-528992