J/MNRAS/510/687 Viewing angle in AGN SED models (Ramos Padilla+, 2022)
The viewing angle in AGN SED models, a data-driven analysis.
Ramos Padilla A.F., Wang L., Malek K., Efstathiou A., Yang G.
<Mon. Not. R. Astron. Soc. 510, 687 (2022)>
=2022MNRAS.510..687R 2022MNRAS.510..687R (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, Seyfert ; Galaxy catalogs ; Models
Keywords: methods: data analysis - methods: statistical -
techniques: photometric - astronomical data bases: miscellaneous -
galaxies: Seyfert
Abstract:
The validity of the unified active galactic nuclei (AGN) model has
been challenged in the last decade, especially when different types of
AGNs are considered to only differ in the viewing angle to the torus.
We aim to assess the importance of the viewing angle in classifying
different types of Seyfert galaxies in spectral energy distribution
(SED) modelling. We retrieve photometric data from publicly available
astronomical databases: CDS and NED, to model SEDs with X-CIGALE in a
sample of 13173 Seyfert galaxies located at redshift range from z=0 to
z=3.5, with a median redshift of z≃0.2. We assess whether the
estimated viewing angle from the SED models reflects different Seyfert
classifications. Two AGN models with either a smooth or clumpy torus
structure are adopted in this paper. We find that the viewing angle in
Type-1 AGNs is better constrained than in Type-2 AGNs. Limiting the
viewing angles representing these two types of AGNs do not affect the
physical parameter estimates such as star-formation rate (SFR) or AGN
fractional contribution (fAGN). In addition, the viewing angle is not
the most discriminating physical parameter to differentiate Seyfert
types. We suggest that the observed and intrinsic AGN disc luminosity
can: i) be used in z<0.5 studies to distinguish between Type-1 and
Type-2 AGNs, and ii) explain the probable evolutionary path between
these AGN types. Finally, we propose the use of X-CIGALE for AGN
galaxy classification tasks. All data from the 13173 SED fits are
available at Zenodo.
Description:
We present the estimations of some of the physical parameters
estimated by CIGALE in a sample of Seyfert galaxies. Each table shows
the different setups used in this work, where tab_sk and tab_fr are
the SKIRTOR and Fritz models with ten different viewing angles, while
the sk37 and fr37 are the counterparts of the SKIRTOR and Fritz models
with two viewing angles. The physical parameters presented here are
the ones selected in the work for the analysis. The rest of the
derived physical parameters in CIGALE (more than 60) are located in
the Zenodo repository (https://doi.org/10.5281/zenodo.5221764).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tab_sk.dat 192 7992 Selected data from the SKIRTOR setup
tab_fr.dat 192 8416 Selected data from the Fritz setup
tab_fr37.dat 192 8275 Selected data from the Fritz 30/70 setup
tab_sk37.dat 192 8031 Selected data from the SKIRTOR 30/70 setup
--------------------------------------------------------------------------------
See also:
https://doi.org/10.5281/zenodo.5221764 : complementary data
Byte-by-byte Description of file: tab*.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 30 A30 --- Name Galaxy ID
32- 40 F9.5 deg RAdeg Right ascension (J2000)
42- 50 F9.5 deg DEdeg Declination (J2000)
52- 54 A3 --- SMBtype Seyfert type in Simbad (at the moment of
the analysis)
56- 59 A4 --- VCVtype Seyfert type in 2010A&A...518A..10V 2010A&A...518A..10V
61- 68 F8.5 deg AGNi AGN viewing angle (agn.i)
70- 76 F7.5 --- AGNfrac AGN fraction (agn.fracAGN)
78- 85 F8.5 [Lsun] AGNLDisk log observed AGN disk luminosity
(agn.disk_luminosity)
87- 93 F7.5 mag E(B-V) E(B-V) of polar dust (agn.EBV)
95-101 F7.5 mag attE(B-V) Color excess of the nebular light
(attenuation.E_BVs)
103-110 F8.5 [Msun/yr] logSFR log star formation rate (sfh.sfr)
112-118 F7.5 [Myr] log(taumain) log e-folding time of the main stellar
population model (sfh.tau_main)
120-127 F8.5 [Lsun] AGNaccpower log intrinsic AGN accretion power
(agn.accretion_power)
129-136 F8.5 deg e_AGNi AGN viewing angle error (agn.i_err)
138-144 F7.5 --- e_AGNfrac AGN fraction error (agn.fracAGN_err)
146-152 F7.5 [Lsun] e_AGNLDisk log observed AGN disk luminosity error
(agn.diskluminosityerr)
154-160 F7.5 mag e_E(B-V) E(B-V) of polar dust error (agn.EBV_err)
162-168 F7.5 mag e_attE(B-V) Color excess of the nebular light error
(attenuation.EBVserr)
170-176 F7.5 [Msun/yr] e_logSFR log star formation rate error
(sfh.sfr_err)
178-184 F7.5 [Myr] e_log(taumain) log e-folding time error of the main
stellar population model
(sfh.taumainerr)
186-192 F7.5 [Lsun] e_AGNaccpower log intrinsic AGN accretion power error
(agn.accretionpowererr)
--------------------------------------------------------------------------------
Acknowledgements:
Andres Felipe Ramos Padilla, ramos(at)astro.rug.nl
(End) Patricia Vannier [CDS] 11-Jan-2022