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The chemistry of galaxies. I - The nature of giant extragalactic H II regions
Abstract
The emission properties presently derived from spectrophotometric observations of 99 H II regions in 20 spiral and irregular galaxies form a one-parameter sequence, and the oxygen abundance is found to be the underlying physical determinant of the spectrum of a giant extragalactic H II region. The ionizing radiation field hardens with decreasing abundance, and oxygen and nitrogen abundances appear to be closely coupled above an oxygen abundance of about 0.2 times that of the sun. Sulfur appears to grow as a primary product of nucleosynthesis with respect to oxygen. The visual continuum of the H II regions seems to be primarily contributed by nonionizing supergiants in the embedded OB associations. The bulk of the extinction of the nebular emission is caused by surrounding dust clouds and dust uniformly distributed throughout the disk of the host galaxy.
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Cited by
Tremonti, C. A., Heckman, T. M., Kauffmann, G., Brinchmann, J., Charlot, S., White, S. D. M., Seibert, M., Peng, E. W., Schlegel, D. J., Uomoto, A., et al. (2004) · The Astrophysical Journal · doi:10.1086/423264 · Cited by 3,608
COSMOS PHOTOMETRIC REDSHIFTS WITH 30-BANDS FOR 2-deg2
Ilbert, O., Capak, P., Salvato, M., Aussel, H., McCracken, H. J., Sanders, D. B., Scoville, N., Kartaltepe, J., Arnouts, S., Floc'h, E. L., et al. (2009) · The Astrophysical Journal · doi:10.1088/0004-637x/690/2/1236 · Cited by 1,259
DUST-CORRECTED STAR FORMATION RATES OF GALAXIES. I. COMBINATIONS OF Hα AND INFRARED TRACERS
Kennicutt, R. C., Hao, C.-N., Calzetti, D., Moustakas, J., Dale, D. A., Bendo, G., Engelbracht, C. W., Johnson, B. D., & Lee, J. C. (2009) · The Astrophysical Journal · doi:10.1088/0004-637x/703/2/1672 · Cited by 604
Star Formation Thresholds in Galactic Disks
Martin, C. L., & Kennicutt, Jr. (2001) · The Astrophysical Journal · doi:10.1086/321452 · Cited by 490
New light on the search for low-metallicity galaxies — I. The N2 calibrator
Denicoló, G., Terlevich, R., & Terlevich, E. (2002) · Monthly Notices of the Royal Astronomical Society · doi:10.1046/j.1365-8711.2002.05041.x · Cited by 451
Metadata
- Authors
- McCall, M. L., Rybski, P. M., & Shields, G. A.
- Venue
- The Astrophysical Journal Supplement Series
- Publisher
- American Astronomical Society
- Published
- 1985-01
- Volume
- 57
- Pages
- 1
- ISSN
- 0067-0049 (ISSN-L)
- 1538-4365
- OpenAlex
- W2041429415
- Cited by
- 519
- References
- 0
- Type
- conference abstract
- Language
- en
- Open access
- closed
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- McCall, M. L., Rybski, P. M., & Shields, G. A. (1985). The chemistry of galaxies. I - The nature of giant extragalactic H II regions. The Astrophysical Journal Supplement Series. https://doi.org/10.1086/190994
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