J/ApJ/912/126ivo://CDS.VizieR/J/ApJ/912/126doi:10.26093/cds/vizier.19120126CDSLyu J.Rieke G.H.2023-01-10T08:28:01Z2022-11-30T14:07:13ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinfrared-photometryvisible-astronomyWe probe the dusty environment of the archetypical Type 1 active galactic nucleus (AGN) in NGC 4151 with comprehensive IR reverberation mapping over several decades, in the J (~1.22{mu}m), H (~1.63{mu}m), K (~2.19{mu}m), L (~3.45{mu}m), and N bands (~10.6{mu}m), plus multiple measurements at 20-40{mu}m. At 1-4{mu}m, the hot dust reverberation signals come from two distinct dust populations at separate radii (~0.033pc and ~0.076pc), with temperatures of ~1500-2500K and ~900-1000K, consistent with the expected properties of sublimating graphite and silicate dust grains. The domination of the torus infrared output by carbon and silicate grains near their sublimation temperatures and radii may account for the general similarity of AGN near-IR spectral energy distributions. The torus inner edge defined by the hottest dust remains at roughly the same radius independent of the AGN optical luminosity over ~25yr. The emission by hot dust warmed directly by the optical/UV AGN output has increased gradually by ~4% yr-1, indicating a possibly growing torus. A third dust component at ~700K does not seem to participate directly in the IR reverberation behavior, and its emission may originate deep in the circumnuclear torus. We find a reverberation signal at ~10{mu}m with an inferred radius for the warm dust of ~2.2-3.1pc. The lack of variability at 20-40{mu}m indicates that the far-IR emission comes from even more extended regions. The torus properties revealed by dust reverberation analysis are inconsistent with predictions from pure clumpy torus models. Instead, the longer-wavelength emission possibly originates in a flared torus or the polar wind.2021ApJ...912..126Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/912/126CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/95/1 : Atlas of Quasar Energy Distributions (Elvis+ 1994)J/AJ/126/1607 : IRAS Revised Bright Galaxy Sample (Sanders+, 2003)J/ApJ/622/129 : Lag-luminosity relationship in AGN (Sergeev+, 2005)J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)J/ApJ/692/556 : Star forming galaxy templates (Rieke+, 2009)J/A+A/558/A149 : VLTI/MIDI AGN Large Program observations (Burtscher+, 2013)J/ApJS/209/14 : The Swift/BAT hard X-ray transient monitor (Krimm+, 2013)J/MNRAS/439/1648 : Subarcsecond mid-infrared atlas of local AGN (Asmus+, 2014)J/ApJ/788/159 : 17 Seyfert 1 galaxies light curves (Koshida+, 2014)J/A+A/583/A120 : AGN torus models. SED library (Siebenmorgen+, 2015)J/ApJ/840/41 : X-ray/UV Swift monitoring of NGC 4151 (Edelson+, 2017)J/ApJ/841/76 : Intrinsic far-IR SED of luminous AGNs (Lyu+, 2017)J/A+A/632/A61 : NGC1068 CO and HCO images (Garcia-Burillo+, 2019)J/ApJ/884/11 : 6 AGN dusty torus models. II. (Gonzalez-Martin+, 2019)J/A+A/624/A42 : H2O megamaser galaxies radio continuum 5GHz (Kamali+, 2019)J/ApJ/886/33 : MIR reverberation mapping of z<0.5 PG AGNs (Lyu+, 2019)J/ApJ/886/150 : VRI and K-band light curves of type 1 AGNs (Minezaki+, 2019)J/ApJ/902/26 : HST opt. & H-band obs. of Cepheids in NGC4151 (Yuan+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/912/126https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/912/126http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/912/126https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/912/126https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/912/126http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/912/126GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/912/126/table1Galaxy-subtracted B, J, H, K, L light curves of NGC 4151recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJD[2439941.4/2458332.3] Julian Datedtime.epochdoubleBand[BJHKL] Band (B, J, H, K, L)meta.code;instr.filtercharFlux[-7.5/551.8] Flux density in BandmJyphot.flux.densityfloatr_FluxReference source for Flux (1)meta.refchar