Rediscussion of Balmer decrement of broad-line radio-galaxies

Details Rediscussion of Balmer decrement of broad-line radio-galaxies Rediscussion of Balmer decrement of broad-line radio-galaxies

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.132..405c&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 132, no. 2, April 1987, p. 405-407.

Astronomy and Astrophysics

Astrophysics

4

Balmer Series, Emission Spectra, Radio Galaxies, Seyfert Galaxies, Cerenkov Radiation, H Alpha Line, H Beta Line, H Gamma Line, Quasars

Scientific paper

On the basis of the Čerenkov line emission theory in the optically thick case, a new interpretation of intensity ratios Hα/Hβ and Hγ/Hβ in broad-line radio-galaxies (BLRGs) is reported. Calculation shows that if the theoretical ratio Hγ/Hβ is just taken to be the mean observed value 0.21, equivalently, the parameter X(Hβ) = 3.0, then the expected ratio Hα/Hβ = 6.70 is almost the same as the observations. By comparing these values with the previous investigations of QSOs (X(Hβ) = 20.9), the authors conclude that the number density of neutral hydrogen gas in BLRGs is almost one order-of-magnitude smaller than that in the QSOs.

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