X-ray emission from giant H II regions in M101

Rosa Murphy Williams, You Hua Chu

Research output: Contribution to journalArticlepeer-review


We have examined the archival ROSAT Position Sensitive Proportional Counter and the High-Resolution Imager images of the galaxy M101 to study the X-ray properties of its giant H II regions. All five giant H II regions NGC 5447, NGC 5455, NGC 5461, NGC 5462, and NGC 5471, show X-ray emission. By observing their basic properties, such as size, hardness ratio, and estimated luminosity, and by comparisons with better known regions in the LMC, we are able to suggest some possible mechanisms for the sources of the X-ray emission.

Original languageEnglish (US)
Pages (from-to)132-144
Number of pages13
JournalAstrophysical Journal
Issue number1
StatePublished - Jan 20 1995


  • Galaxies: individual (M101)
  • H II regions
  • Hydrodynamics
  • X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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