Preso da http://arxiv.org/abs/1611.05165

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<subfield code="9">arXiv</subfield>
<subfield code="a">oai:arXiv.org:1611.05165</subfield>
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<subfield code="a">Thomas, Adam D.</subfield>
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A physically-based model of the ionizing radiation from active galaxies for photoionization modeling
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<subfield code="9">arXiv</subfield>
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<subfield code="c">2016-11-16</subfield>
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14 pages, 9 figures, 1 table. Accepted for publication in ApJ
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<subfield code="a">*Brief entry*</subfield>
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We present a simplified model of Active Galactic Nucleus (AGN) continuum emission designed for photoionization modeling. The new model {\sc oxaf} reproduces the diversity of spectral shapes that arise in physically-based models. We identify and explain degeneracies in the effects of AGN parameters on model spectral shapes, with a focus on the complete degeneracy between the black hole mass and AGN luminosity. Our re-parametrized model {\sc oxaf} removes these degeneracies and accepts three parameters which directly describe the output spectral shape: the energy of the peak of the accretion disk emission $E_\mathrm{peak}$, the photon power-law index of the non-thermal emission $\Gamma$, and the proportion of the total flux which is emitted in the non-thermal component $p_\mathrm{NT}$. The parameter $E_\mathrm{peak}$ is presented as a function of the black hole mass, AGN luminosity, and `coronal radius' of the {\sc optxagnf} model upon which {\sc oxaf} is based. We show that the soft X-ray excess does not significantly affect photoionization modeling predictions of strong emission lines in Seyfert narrow-line regions. Despite its simplicity, {\sc oxaf} accounts for opacity effects where the accretion disk is ionized because it inherits the `color correction' of {\sc optxagnf}. We use a grid of {\sc mappings} photoionization models with {\sc oxaf} ionizing spectra to demonstrate how predicted emission-line ratios on standard optical diagnostic diagrams are sensitive to each of the three {\sc oxaf} parameters. The {\sc oxaf} code is publicly available in the Astrophysics Source Code Library.
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http://arxiv.org/licenses/nonexclusive-distrib/1.0/
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<subfield code="a">Groves, Brent A.</subfield>
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<subfield code="a">Sutherland, Ralph S.</subfield>
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<subfield code="a">Dopita, Michael A.</subfield>
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<subfield code="a">Jin, Chichuan</subfield>
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<subfield code="a">Kewley, Lisa J.</subfield>
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/eos/.../arXiv:1611.05165.pdf
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