Published June 1984
| Version v1
Journal article
Theoretical hydrogen-line ratios for the narrow-line regions of active galactic nuclei
Description
H-alpha/H-beta (Ha/Hb) and other hydrogen line ratios for narrow line regions (NLR) of active galactic nuclei (AGN) were calculated, and their sensitivity to model parameters was investigated. The computations were performed with the photoionization code CLOUDY, with hydrogen treated as a seven-level plus continuum atom. Ha/Hb was sensitive to the ionization parameter and only weakly dependent on the electron density. Metallicity and the shape of the UV to X-ray continuum had the greatest impacts. It is recommended that Ha/Hb with a value of 3.0 be used as a reddening indicator for NLR of AGN. 21 references
Additional details
Publishing Information
- Journal Title
- Publ. Astron. Soc. Pac.
- Journal Volume
- 96
- Series
- Publ. Astron. Soc. Pac.
- Journal Page Range
- 393-397
- ISSN
- 0004-6280
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 16048177
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- BALMER LINES; COSMIC GASES; ELECTRON DENSITY; GALAXY NUCLEI; MATHEMATICAL MODELS; QUASARS; RADIATION TRANSPORT; SEYFERT GALAXIES
- Descriptors DEC
- COSMIC RADIO SOURCES; FLUIDS; GALAXIES; GASES