%0 Generic %1 thomas2016physicallybased %A Thomas, Adam D. %A Groves, Brent A. %A Sutherland, Ralph S. %A Dopita, Michael A. %A Jin, Chichuan %A Kewley, Lisa J. %D 2016 %K agn models photoionisation %T A physically-based model of the ionizing radiation from active galaxies for photoionization modeling %U http://arxiv.org/abs/1611.05165 %X We present a simplified model of Active Galactic Nucleus (AGN) continuum emission designed for photoionization modeling. The new model 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 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 $E_peak$, 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 $p_NT$. The parameter $E_peak$ is presented as a function of the black hole mass, AGN luminosity, and `coronal radius' of the optxagnf model upon which 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, 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 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 oxaf code is publicly available in the Astrophysics Source Code Library.

@misc{thomas2016physicallybased, abstract = {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.}, added-at = {2016-11-17T09:35:21.000+0100}, author = {Thomas, Adam D. and Groves, Brent A. and Sutherland, Ralph S. and Dopita, Michael A. and Jin, Chichuan and Kewley, Lisa J.}, biburl = {https://www.bibsonomy.org/bibtex/2f51ef9590cc7b80d20b0d76e2926147f/miki}, description = {[1611.05165] A physically-based model of the ionizing radiation from active galaxies for photoionization modeling}, interhash = {eca6d0ee5dc2544b2079a46483b490c0}, intrahash = {f51ef9590cc7b80d20b0d76e2926147f}, keywords = {agn models photoionisation}, note = {cite arxiv:1611.05165Comment: 14 pages, 9 figures, 1 table. Accepted for publication in ApJ}, timestamp = {2016-11-17T09:35:21.000+0100}, title = {A physically-based model of the ionizing radiation from active galaxies for photoionization modeling}, url = {http://arxiv.org/abs/1611.05165}, year = 2016 }