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The Escape of Ionizing Photons from the Galaxy
Open accessAbstract
The Magellanic Stream and several high-velocity clouds have now been detected in optical line emission. The observed emission measures and kinematics are most plausibly explained by photoionization due to hot, young stars in the Galactic disk. The highly favorable orientation of the Stream allows an unambiguous determination of the fraction of ionizing photons f which escape the Galactic disk. We have modeled the production and transport of ionizing photons through an opaque interstellar medium. Normalization to the Stream detections requires f ≈6%, which is in reasonable agreement with the flux required to ionize the Reynolds layer. Neither shock heating nor emission within a hot Galactic corona can be important in producing the observed Hα emission. If such a large escape fraction is typical of L galaxies, star-forming systems dominate the extragalactic ionizing background. Within the context of this model, both the three-dimensional orientation of the Stream and the distances to high-velocity clouds can be determined by sensitive Hα observations.
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Cited by
Veilleux, S., Cecil, G., & Bland-Hawthorn, J. (2005) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.43.072103.150610 · Cited by 1,504
Self-citationHighly Ionized High‐Velocity Gas in the Vicinity of the Galaxy
Sembach, K. R., Wakker, B. P., Savage, B. D., Richter, P., Meade, M., Shull, J. M., Jenkins, E. B., Sonneborn, G., & Moos, H. W. (2003) · The Astrophysical Journal Supplement Series · doi:10.1086/346231 · Cited by 479
Ouchi, M., Shimasaku, K., Okamura, S., Furusawa, H., Kashikawa, N., Ota, K., Doi, M., Hamabe, M., Kimura, M., Komiyama, Y., et al. (2004) · The Astrophysical Journal · doi:10.1086/422207 · Cited by 444
Distances and Metallicities of High‐ and Intermediate‐Velocity Clouds
Wakker, B. P. (2001) · The Astrophysical Journal Supplement Series · doi:10.1086/321783 · Cited by 345
The First Cosmic Structures and Their Effects
Ciardi, B., & Ferrara, A. (2005) · Space Science Reviews · doi:10.1007/s11214-005-3592-0 · Cited by 345
Metadata
- Authors
- Bland-Hawthorn, J., & Maloney, P. R.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1999-01-01
- Volume
- 510
- Issue
- 1
- Pages
- L33-L36
- ISSN
- 0004-637X (ISSN-L)
- OpenAlex
- W2073084722
- Cited by
- 191
- References
- 0
- FWCI
- 14.34
- Type
- journal article
- Language
- en
- Open access
- bronze
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