期刊
ASTROPHYSICAL JOURNAL
卷 833, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/833/2/245
关键词
galaxies: active; galaxies: nuclei; galaxies: Seyfert; techniques: spectroscopic; X-rays: galaxies; X-rays: individual (IC 3639)
资金
- National Aeronautics and Space Administration
- STFC [ST/J003697/2]
- RAS
- Majlis Amanah Rakyat (MARA), Malaysia
- Caltech NuSTAR [44A-1092750]
- European Research Council [ERC-2015-StG-677117]
- Swiss National Science Foundation (SNSF) [PZOOP2_154799/1]
- NASA
- ASI/INAF grant [I/037/12/0-011/13]
- NASA NuSTAR A01 Award [NNX15AV27G]
- CONICYT-Chile [Basal-CATA PFB-06/2007]
- FONDECYT Regular [1141218, 1151408]
- China-CONICYT
- Ministry of Economy, Development, and Tourism's Millennium Science Initiative [IC120009]
- STFC [1860154] Funding Source: UKRI
We analyze high-quality NuSTAR observations of the local (z = 0.011) Seyfert 2 active galactic nucleus (AGN) IC 3639, in conjunction with archival Suzaku and Chandra data. This provides the first broadband X-ray spectral analysis of the source, spanning nearly two decades in energy (0.5-30 keV). Previous X-ray observations of the source below 10 keV indicated strong reflection/obscuration on the basis of a pronounced iron fluorescence line at 6.4 keV. The hard X-ray energy coverage of NuSTAR, together with self-consistent toroidal reprocessing models, enables direct broadband constraints on the obscuring column density of the source. We find the source to be heavily Compton-thick (CTK) with an obscuring column in excess of 3.6 x 10(24) cm(-2), unconstrained at the upper end. We further find an intrinsic 2-10 keV luminosity of log(10) (L2-10keV[erg s(-1)] = 43.4(-1.1)(+0.6) to 90% confidence, almost 400 times the observed flux, and consistent with various multiwavelength diagnostics. Such a high ratio of intrinsic to observed flux, in addition to an Fe-K alpha fluorescence line equivalent width exceeding 2 keV, is extreme among known bona fide CTK AGNs, which we suggest are both due to the high level of obscuration present around IC 3639. Our study demonstrates that broadband spectroscopic modeling with NuSTAR enables large corrections for obscuration to be carried out robustly and emphasizes the need for improved modeling of AGN tori showing intense iron fluorescence.
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