X-ray heating and ionization of broad-line emission regions in QSOs and active galaxies

Details X-ray heating and ionization of broad-line emission regions in QSOs and active galaxies X-ray heating and ionization of broad-line emission regions in QSOs and active galaxies

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..406w&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 406-415.

Astronomy and Astrophysics

Astrophysics

79

Active Galaxies, Emission Spectra, Galactic Nuclei, Gas Heating, Gas Ionization, Quasars, X Ray Absorption, Balmer Series, H Alpha Line, H I Regions, H Ii Regions, Line Spectra, Lyman Alpha Radiation, Spectral Line Width, Spectrum Analysis, Trapped Particles, X Ray Sources

Scientific paper

The absorption of X-rays deep within the broad-line emitting clouds in quasars and the nuclei of active galaxies produces extensive zones of warm (about 10,000 K), partially ionized gas. Because Lyman-alpha photons are trapped in these regions, the X-ray energy is efficiently channeled into Balmer lines collisionally excited from the n = 2 level. These H I regions and the H II regions created by UV photons illuminating the surfaces of the clouds gives rise to integrated Lyman-alpha/H-alpha lines emission ratios between 1 and 2. Enhanced Mg II line emission from the H I regions gives rise to integrated Mg II/H-alpha ratios near 0.5. The O I line at 8446 A is efficiently pumped by trapped H-alpha photons; and an intensity ratio of I(8446 A)/I(H-alpha) of approximately equal to and not greater than 0.1 is calculated for the X-ray heated zone.

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