J/A+A/692/A209ivo://CDS.VizieR/J/A+A/692/A209doi:10.26093/cds/vizier.36920209CDSLopez I.E.Yang G.Mountrichas G.Brusa M.Alexander D.M.Baldi R.D.,Bertola E.Bonoli S.Comastri A.Shankar F.Acharya N.,Alonso Tetilla A.V.Lapi A.Laloux B.Lopez Lopez X.Munoz Rodriguez I.,Musiimenta B.Osorio Clavijo N.Sala L.Sengupta D.2025-10-09T20:02:02Z2024-12-13T10:48:46ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fractive-galactic-nucleix-ray-sourcesradio-sourcesThe spectral energy distribution (SED) of low-luminosity active galactic nuclei (LLAGN) presents unique challenges as the emission from these objects is comparable to the radiation from their host galaxy and the accretion physics involved is particularly complex. This study introduces a novel CIGALE module specifically designed to address these challenges. The module combines the empirical L_X_-L_12um_ relationship with physically motivated accretion models, such as advection-dominated accretion flows (ADAFs) and truncated accretion disks, providing a more accurate depiction of LLAGN central engine emission. A mock analysis of the module revealed good recovery of true parameters, with only a slight bias toward higher input values, further validating its reliability. We tested the module on a sample of 50 X-ray-detected local galaxies, including low-ionization nuclear emission-line regions (LINERs) and Seyferts, and demonstrated its capacity to accurately estimate bolometric luminosities, even in the presence of significant galaxy contamination. Notably, the previous X-ray module failed to provide AGN solutions for this sample, stressing the need for a novel approach. Comparisons with mid-luminosity AGN datasets confirm the module's robustness and applicability up to L_X<10^45^erg/s. We also expanded the X-ray-to-bolometric correction formula, making it applicable to AGN spanning ten orders of magnitude in luminosity, and revealing lower k_X_ values for LLAGN than typically assumed. Additionally, our analysis of the alpha_ox_ index, which represents the slope between UV and X-ray emissions, uncovered trends that differ from those observed in high-luminosity AGN. Unlike quasars, where alpha_ox_ correlates with lambda_Edd_, LLAGN exhibit nearly constant or weakly correlated alpha_ox_ values, suggesting a shift in accretion physics and photon production mechanisms in low-luminosity regimes. These results underscore the importance of a multiwavelength approach in AGN studies and reveal distinct behaviors in LLAGN compared to quasars. Our findings significantly advance our understanding of LLAGN and offer a comprehensive framework for future research to complete the AGN population census.2024A&A...692A.209Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/692/A209CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/692/A209https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/692/A209http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/692/A209https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/692/A209https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/692/A209http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/692/A209GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/692/A209/table1 (Key properties of galaxies in the LLAGN sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/692/A209/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/692/A209/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/692/A209/table1?GETtext/xml+votable180.050000true40.269-8.25580.0055555555555555566/4447 5196 5469 5629 5975-5976 5982 6103 7132 7241 7374 7385 7424 7606 7642 7659 7941 8085 10454 10475 10841 10856 10924-10925 10927 10977 11246 11263 11435 11457 12018 13522 25083 25972 26338 26365 27714 27765 27773 27914 27936 28015 28123 28141-28142 28538 36785https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/692/A209?format=asciiX-rayRadiodefaultJ/A+A/692/A209/table1Key properties of galaxies in the LLAGN samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintpropindicates properties in table3meta.ref.urlcharNameGalaxy namemeta.id;meta.maincharprimaryRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzRedshiftsrc.redshiftdoubleDistDistanceMpcpos.distancefloatSimbadSimbad column added by the CDSmeta.ref.urlcharRefCAT[1/7] Reference (1)meta.bibintlogLum2-10log X-ray luminosity between 2-10keVlog(1e-07W)phys.luminosity;em.X-rayfloatJ/A+A/692/A209/table3Properties obtained from the SED fitting of the LLAGN (corrected version 09-Oct-2025)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy Namemeta.id;meta.maincharlogLACRlog Intrinsic AGN accretion luminositylog(1e-07W)phys.luminosity;em.X-rayfloate_logLACRError on log Intrinsic AGN accretion luminositylog(1e-07W)stat.errorfloatlambdaEddEddington ratephys.luminosity;arith.ratiodoublelogLBollog Bolometric AGN luminositylog(1e-07W)phys.luminosityfloate_logLBolError log Bolometric AGN luminositylog(1e-07W)stat.errorfloatLXcigalemodelled X-ray AGN Luminosity between 2-10keVlog(1e-07W)phys.luminosity;em.X-rayfloate_LXcigaleError on modelled X-ray AGN Luminosity between 2-10keVlog(1e-07W)stat.errorfloatlogL2500Monocromatic AGN luminosity measure at 2500{AA}log(1e-07W.Hz**-1)phys.luminosityfloate_logL2500Error on Monocromatic AGN luminosity measure at 2500{AA}log(1e-07W.Hz**-1)stat.errorfloatlogL2kevMonocromatic AGN luminosity measure at 2keVlog(1e-07W.Hz**-1)phys.luminosity;em.X-ray.softfloate_logL2kevError on Monocromatic AGN luminosity measure at 2keVlog(1e-07W.Hz**-1)stat.errorfloatalphaoxSlope between the X-ray emission and UVmeta.crypticfloate_alphaoxError on slope between the X-ray emission and UVstat.errorfloat