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Classification parameters for the emission-line spectra of extragalactic objects
Open accessAbstract
An investigation is made of the merits of various emission-line intensity ratios for classifying the spectra of extragalactic objects. It is shown empirically that several combinations of easily-measured lines can be used to separate objects into one of four categories according to the principal excitation mechanism: normal H II regions, planetary nebulae, objects photoionized by a power-law continuum, and objects excited by shock-wave heating. A two-dimensional quantitative classification scheme is suggested.
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Citations
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
CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation⋆
Sánchez, S. F., Kennicutt, R. C., Gil de Paz, A., van de Ven, G., Vílchez, J. M., Wisotzki, L., Walcher, C. J., Mast, D., Aguerri, J. A. L., Albiol-Pérez, S., et al. (2012) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201117353 · Cited by 1,254
Eldridge, J. J., Stanway, E. R., Xiao, L., McClelland, L. A. S., Taylor, G., Ng, M., Greis, S. M. L., & Bray, J. C. (2017) · Publications of the Astronomical Society of Australia · doi:10.1017/pasa.2017.51 · Cited by 1,019
Birth of a relativistic outflow in the unusual γ-ray transient Swift J164449.3+573451
Zauderer, B. A., Berger, E., Soderberg, A. M., Loeb, A., Narayan, R., Frail, D. A., Petitpas, G. R., Brunthaler, A., Chornock, R., Carpenter, J. M., et al. (2011) · Nature · doi:10.1038/nature10366 · Cited by 423
Data mining and machine learning in astronomy
BALL, N. M., & BRUNNER, R. J. (2010) · International Journal of Modern Physics D · doi:10.1142/s0218271810017160 · Cited by 383
Metadata
- Authors
- Baldwin, J. A., Phillips, M. M., & Terlevich, R.
- Venue
- Publications of the Astronomical Society of the Pacific
- Publisher
- IOP Publishing
- Published
- 1981-02
- Volume
- 93
- Pages
- 5
- ISSN
- 0004-6280 (ISSN-L)
- 1538-3873
- OpenAlex
- W1967876247
- Cited by
- 5,132
- References
- 0
- FWCI
- 5.38
- Type
- journal article
- Language
- en
- Open access
- bronze
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- CoChat. (2026). Citation check: Classification parameters for the emission-line spectra of extragalactic objects. https://app.cochat.ai/papers/10.1086/130766
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- Baldwin, J. A., Phillips, M. M., & Terlevich, R. (1981). Classification parameters for the emission-line spectra of extragalactic objects. Publications of the Astronomical Society of the Pacific. https://doi.org/10.1086/130766
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