X-CIGALE: fitting AGN/galaxy SEDs from X-ray to infrared. (arXiv:2001.08263v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Yang_G/0/1/0/all/0/1">Guang Yang</a> (Texas A&amp;M), <a href="http://arxiv.org/find/astro-ph/1/au:+Boquien_M/0/1/0/all/0/1">M. Boquien</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Buat_V/0/1/0/all/0/1">V. Buat</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Burgarella_D/0/1/0/all/0/1">D. Burgarella</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ciesla_L/0/1/0/all/0/1">L. Ciesla</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Duras_F/0/1/0/all/0/1">F. Duras</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stalevski_M/0/1/0/all/0/1">M. Stalevski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brandt_W/0/1/0/all/0/1">W. N. Brandt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Papovich_C/0/1/0/all/0/1">C. Papovich</a>

CIGALE is a powerful multiwavelength spectral energy distribution (SED)
fitting code for extragalactic studies. However, the current version of CIGALE
is not able to fit X-ray data, which often provide unique insights into AGN
intrinsic power. We develop a new X-ray module for CIGALE, allowing it to fit
SEDs from the X-ray to infrared (IR). We also improve the AGN fitting of CIGALE
from UV-to-IR wavelengths. We implement a modern clumpy two-phase torus model,
SKIRTOR. To account for moderately extincted type 1 AGNs, we implement
polar-dust extinction. We publicly release the source code (named X-CIGALE). We
test X-CIGALE with X-ray detected AGNs in SDSS, COSMOS, and AKARI-NEP. The
fitting quality (as indicated by reduced $chi^2$) is good in general,
indicating that X-CIGALE is capable of modelling the observed SED from X-ray to
IR. We discuss constrainability and degeneracy of model parameters in the
fitting of AKARI-NEP, for which excellent mid-IR photometric coverage is
available. We also test fitting a sample of AKARI-NEP galaxies for which only
X-ray upper limits are available from Chandra observations, and find that the
upper limit can effectively constrain the AGN SED contribution for some
systems. Finally, using X-CIGALE, we assess the ability of Athena to constrain
the AGN activity in future extragalactic studies.

CIGALE is a powerful multiwavelength spectral energy distribution (SED)
fitting code for extragalactic studies. However, the current version of CIGALE
is not able to fit X-ray data, which often provide unique insights into AGN
intrinsic power. We develop a new X-ray module for CIGALE, allowing it to fit
SEDs from the X-ray to infrared (IR). We also improve the AGN fitting of CIGALE
from UV-to-IR wavelengths. We implement a modern clumpy two-phase torus model,
SKIRTOR. To account for moderately extincted type 1 AGNs, we implement
polar-dust extinction. We publicly release the source code (named X-CIGALE). We
test X-CIGALE with X-ray detected AGNs in SDSS, COSMOS, and AKARI-NEP. The
fitting quality (as indicated by reduced $chi^2$) is good in general,
indicating that X-CIGALE is capable of modelling the observed SED from X-ray to
IR. We discuss constrainability and degeneracy of model parameters in the
fitting of AKARI-NEP, for which excellent mid-IR photometric coverage is
available. We also test fitting a sample of AKARI-NEP galaxies for which only
X-ray upper limits are available from Chandra observations, and find that the
upper limit can effectively constrain the AGN SED contribution for some
systems. Finally, using X-CIGALE, we assess the ability of Athena to constrain
the AGN activity in future extragalactic studies.

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