Does the Milky Way launch a large-scale wind?

John E. Everett*, Ellen G. Zweibel, Robert A. Benjamin, Dan McCammon, Lindsay Rocks, Donald P. Cox, John S. Gallagher

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The ROSAT All-Sky Survey revealed soft X-ray emission on kiloparsec scales towards the Galactic center. Separately, it has also been observed that the cosmic ray intensity (measured via γ-ray emission) rises only very slowly towards the center of the Galaxy, counter to expectations based on the greater number of cosmic ray sources there. A thermal and cosmic-ray driven wind could potentially explain both of these observations. We find that a cosmic-ray and thermally driven wind fits the X-ray observations well; in fact, a wind fits significantly better than an earlier-proposed static-polytrope gas model.

Original languageEnglish (US)
Pages (from-to)105-110
Number of pages6
JournalAstrophysics and Space Science
Volume311
Issue number1-3
DOIs
StatePublished - Oct 2007

Keywords

  • Galaxy: bulge
  • Galaxy: dynamics
  • Galaxy: evolution
  • ISM: outflows

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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