Possible continuum-diluting processes to generate Linear-like spectra

Details Possible continuum-diluting processes to generate Linear-like spectra Possible continuum-diluting processes to generate Linear-like spectra

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..713s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. 713-719

Astronomy and Astrophysics

Astrophysics

10

Absorptivity, Accretion Disks, Active Galactic Nuclei, Interstellar Magnetic Fields, Line Spectra, Photoionization, Shock Waves, Stellar Temperature, Anisotropy, Computerized Simulation, Interstellar Matter, Ionized Gases, Stellar Atmospheres, Stellar Models

Scientific paper

The emission-line ratios of low-ionization nuclear emission-line regions (LINERS) have usually been modelled by radiative shocks or clouds photoionized by power-law continua with a low ionization parameter. Recently it has been suggested that diluted input spectra from stars with Teff approximately 50,000 K can also produce LINERs. We extend these studies by demonstrating that ionizing continua diluted by gaseous absorption (as may be expected in dense interstellar media) can produce LINER spectra. In this way, stars of approximately 40,000 K, which are representative for a normal interstellar magnetic field (IMF) can give rise to LINERs with weak (OI) lines. The whole range of LINER-type emission line ratios can be reached via photoionization from two other types of continua: (1) an average active galactic nuclei (AGN) continuum with an EUV bump represented by radiation from a face-on Madau (1988) accretion disk, which is distorted by a gaseous absorber; (2) an AGN continuum from an inclined accretion disk.

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