XMM-NEWTON DETECTS A HOT GASEOUS HALO IN THE FASTEST ROTATING SPIRAL GALAXY UGC 12591

@article{Dai2012XMMNEWTONDA,
  title={XMM-NEWTON DETECTS A HOT GASEOUS HALO IN THE FASTEST ROTATING SPIRAL GALAXY UGC 12591},
  author={Xinyu Dai and Michael E. Anderson and Joel N. Bregman and Jon M. Miller},
  journal={The Astrophysical Journal},
  year={2012},
  volume={755},
  pages={107}
}
We present our XMM-Newton observation of the fastest rotating spiral galaxy UGC?12591. We detect hot gas halo emission out to 80?kpc from the galaxy center, and constrain the halo gas mass to be smaller than 4.5 ? 1011 M ?. We also measure the temperature of the hot gas as T = 0.64 ? 0.03?keV. Combining our x-ray constraints and the near-infrared and radio measurements in the literature, we find a baryon mass fraction of 0.03-0.05 in UGC?12591, suggesting a missing baryon mass of 70% compared… 
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