Probing the Hot Circumgalactic Medium with Broad O vi and X-Rays

@article{Mathur2020ProbingTH,
  title={Probing the Hot Circumgalactic Medium with Broad O vi and X-Rays},
  author={Smita Mathur and Anjali Gupta and Sanskriti Das and Yair Krongold and Fabrizio Nicastro},
  journal={The Astrophysical Journal},
  year={2020},
  volume={908}
}
Most of the baryonic mass in the circumgalactic medium (CGM) of a spiral galaxy is believed to be warm-hot, with temperature around 106 K. The narrow O vi absorption lines probe a somewhat cooler component at , but broad O vi absorbers have the potential to probe the hotter CGM. Here we present 376 ks Chandra LETG observations of a carefully selected galaxy in which the presence of broad O vi together with the non-detection of Lyα was indicative of hot gas. The strongest line expected to be… 

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