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@kaplun
Created November 17, 2016 08:49
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<datafield tag="035" ind1=" " ind2=" ">
<subfield code="9">arXiv</subfield>
<subfield code="a">oai:arXiv.org:1611.05165</subfield>
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<datafield tag="037" ind1=" " ind2=" ">
<subfield code="9">arXiv</subfield>
<subfield code="a">arXiv:1611.05165</subfield>
<subfield code="c">astro-ph.GA</subfield>
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<datafield tag="100" ind1=" " ind2=" ">
<subfield code="a">Thomas, Adam D.</subfield>
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<datafield tag="245" ind1=" " ind2=" ">
<subfield code="a">
A physically-based model of the ionizing radiation from active galaxies for photoionization modeling
</subfield>
<subfield code="9">arXiv</subfield>
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<datafield tag="269" ind1=" " ind2=" ">
<subfield code="c">2016-11-16</subfield>
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<datafield tag="300" ind1=" " ind2=" ">
<subfield code="a">14</subfield>
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<datafield tag="500" ind1=" " ind2=" ">
<subfield code="a">
14 pages, 9 figures, 1 table. Accepted for publication in ApJ
</subfield>
<subfield code="9">arXiv</subfield>
</datafield>
<datafield tag="500" ind1=" " ind2=" ">
<subfield code="a">*Brief entry*</subfield>
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<datafield tag="520" ind1=" " ind2=" ">
<subfield code="a">
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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<subfield code="9">arXiv</subfield>
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<datafield tag="540" ind1=" " ind2=" ">
<subfield code="u">
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
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<subfield code="b">arXiv</subfield>
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<datafield tag="541" ind1=" " ind2=" ">
<subfield code="a">arxiv</subfield>
<subfield code="c">OAI</subfield>
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<datafield tag="650" ind1="1" ind2="7">
<subfield code="a">astro-ph.GA</subfield>
<subfield code="2">arXiv</subfield>
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<datafield tag="650" ind1="1" ind2="7">
<subfield code="a">Astrophysics</subfield>
<subfield code="2">INSPIRE</subfield>
</datafield>
<datafield tag="650" ind1="1" ind2="7">
<subfield code="a">astro-ph.HE</subfield>
<subfield code="2">arXiv</subfield>
</datafield>
<datafield tag="700" ind1=" " ind2=" ">
<subfield code="a">Groves, Brent A.</subfield>
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<datafield tag="700" ind1=" " ind2=" ">
<subfield code="a">Sutherland, Ralph S.</subfield>
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<datafield tag="700" ind1=" " ind2=" ">
<subfield code="a">Dopita, Michael A.</subfield>
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<datafield tag="700" ind1=" " ind2=" ">
<subfield code="a">Jin, Chichuan</subfield>
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<datafield tag="700" ind1=" " ind2=" ">
<subfield code="a">Kewley, Lisa J.</subfield>
</datafield>
<datafield tag="FFT" ind1=" " ind2=" ">
<subfield code="a">
/eos/.../arXiv:1611.05165.pdf
</subfield>
</datafield>
<datafield tag="980" ind1=" " ind2=" ">
<subfield code="a">arXiv</subfield>
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<datafield tag="980" ind1=" " ind2=" ">
<subfield code="a">Citeable</subfield>
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<datafield tag="980" ind1=" " ind2=" ">
<subfield code="a">HEP</subfield>
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