Suzaku Observations of Heavily Obscured (Compton-thick) Active Galactic Nuclei Selected by the Swift/BAT Hard X-Ray Survey

Tanimoto, A.; Ueda, Yoshihiro; Kawamuro, T.; Ricci, Cláudio; Awaki, Hisamitsu; Terashima, Yuichi

doi:10.3847/1538-4357/aaa47c

Cited by 31 publications

(30 citation statements)

References 101 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are consistent with what is shown in Figure 11 by considering that most sources are at L 14−195 < 10 44 erg s −1 . The same trend is also reported from the X-ray studies of Compton-thick AGN Tanimoto et al 2016). They reported that secure Compton-thick AGN in the local universe do not preferentially locate within the AGN cut or wedge at L 14−195 < 10 43 erg s −1 .…”

Section: Luminosity Dependence Of Covering Factorsupporting

confidence: 82%

“…Follow-up studies below 10 keV have shown that the fraction of obscured (N H ≥ 10 22 cm −2 ) AGN highly depends on the intrinsic X-ray luminosities (e.g., Beckmann et al 2009;Burlon et al 2011;Ricci et al 2014;Kawamuro et al 2016a), and also proved to be an effective tool to identify previously missed class of AGN with small opening angle tori (e.g., Ueda et al 2007;Winter et al 2009;Eguchi et al 2009Eguchi et al , 2011Ricci et al 2011), and Compton-thick AGN Tanimoto et al 2016). Studies carried out by optical spectroscopy enable us to investigate the properties of extended (> 100 pc) narrow line regions (NLR; e.g., Hainline et al 2013Hainline et al , 2014a) through analysis of the [OIII]λ5007 emission line (Winter et al 2009;Ueda et al 2015) and also offer the opportunity to estimate the black hole masses through the broad line regions or velocity dispersion measurements.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Complete Infrared View of Active Galactic Nuclei From the 70 Month Swift/Bat Catalog

Ichikawa

Ricci

Ueda

et al. 2017

ApJ

Self Cite

108

View full text Add to dashboard Cite

We systematically investigate the near-(NIR) to far-infrared (FIR) photometric properties of a nearly complete sample of local active galactic nuclei (AGN) detected in the Swift/Burst Alert Telescope (BAT) all-sky ultra hard X-ray (14-195 keV) survey. Out of 606 non-blazar AGN in the Swift/BAT 70-month catalog at high galactic latitude of |b| > 10• , we obtain IR photometric data of 604 objects by cross-matching the AGN positions with catalogs from the WISE, AKARI, IRAS, and Herschel infrared observatories. We find a good correlation between the ultra-hard X-ray and mid-IR (MIR) luminosities over five orders of magnitude (41 < log(L 14−195 /erg s −1 ) < 46). Informed by previous measures of the intrinsic spectral energy distribution of AGN, we find FIR pure-AGN candidates whose FIR emission is thought to be AGN-dominated with low starformation activity. We demonstrate that the dust covering factor decreases with the bolometric AGN luminosity, confirming the luminositydependent unified scheme. We also show that the completeness of the WISE color-color cut in selecting Swift/BAT AGN increases strongly with 14-195 keV luminosity.

show abstract

Section: Luminosity Dependence Of Covering Factorsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

The Complete Infrared View of Active Galactic Nuclei From the 70 Month Swift/Bat Catalog

Ichikawa

Ricci

Ueda

et al. 2017

ApJ

Self Cite

108

View full text Add to dashboard Cite

show abstract

“…The difference in slope between the one adopted in our paper (Γ ∼ 1.8) and Γ ∼1.5-1.6 can be responsible for our slightly higher value of column density given the degeneracy between the two parameters. We note, however, that once higher energy data are considered as in the work by Tanimoto et al (2018, including Swift/BAT), a photon index of ∼ 1.9 is found.…”

Section: Ngc1194 Spectral Fitsmentioning

confidence: 70%

“…More in detail, in these papers the reported column densities are 1.7 +0.24 −0.25 ×10 24 cm −2 , 0.81 +0.09 −0.08 ×10 24 cm −2 , 1.15 +0.37 −0.28 × 10 24 cm −2 , and 1.4 +0.3 −0.2 × 10 24 cm −2 , respectively. In all these works, the MYTorus model has been adopted (in M16 in its decoupled version), with the exception of Tanimoto et al (2018), where the N H reported above is referred to the phenomenological, best-fitting result. Although the derived column density value from our analysis lies in the upper envelope of the published results, we note that overall the Compton-thick nature of this source is widely confirmed; the line is strong and present in all datasets, and the derived value of EW is fully consistent with literature (e.g., EW=780 +160 −140 eV in M18).…”

Section: Ngc1194 Spectral Fitsmentioning

confidence: 99%

Broad-band X-ray analysis of local mid-infrared-selected Compton-thick AGN candidates

Caria

Vignali

Lanzuisi³

et al. 2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The estimate of the number and space density of obscured AGN over cosmic time still represents an open issue. While the obscured AGN population is a key ingredient of the X-ray background synthesis models and is needed to reproduce its shape, a complete census of obscured AGN is still missing. Here we test the selection of obscured sources among the local 12µm sample of Seyfert galaxies. Our selection is based on a difference up to three orders of magnitude in the ratio between the AGN bolometric luminosity, derived from the spectral energy distribution (SED) decomposition, and the same quantity obtained by the published XMM-Newton 2-10 keV luminosity (L AGN bol (IR)/L AGN bol (X)). The selected sources are UGC05101, NGC1194 and NGC3079 for which the available X-ray wide bandpass, from Chandra and XMM-Newton plus NuSTAR data, extending to energies up to ∼30-45 keV, allows us an accurate determination of the column density, and hence of the true intrinsic power. The newly derived N H values clearly indicate heavy obscuration (∼ 1.2, 2.1 and 2.4 × 10 24 cm −2 for UGC05101, NGC1194 and NGC3079, respectively), and are consistent with the prominent silicate absorption feature observed in the Spitzer -IRS spectra of these sources (9.7µm rest frame). We finally checked that the resulting X-ray luminosities in the 2-10 keV band are in good agreement with those derived from the mid-IR band through empirical L MIR − L X relations.

show abstract

“…Adopting alternative values (i.e., Γ = 1.9, θ inc = 89 • , and θ op = 37 • ) instead of the default values, we can confirm that our conclusion is little affected. Specifically, our model is represented as torusabs*zpowerlw*zhighect +zpowerlw*zhighect *mtable{e-torus_20161121_2500M.fits} +atable{refl_fe_torus.fits} +[Best-fit Model of the XMM-Newton Spectra], almost the same as those used in past studies (e.g., Tanimoto et al 2018;Oda et al 2018). From the first to the third terms, we take account of the absorbed cutoff power law component from an AGN, the reflected emission, and the accompanying 6.4 keV iron-Kα line.…”

Section: Nustar Non-detection Due To Heavymentioning

confidence: 99%

A NuSTAR and XMM-Newton Study of the Two Most Actively Star-forming Green Pea Galaxies (SDSS J0749+3337 and SDSS J0822+2241)

Kawamuro

Ueda

Ichikawa³

et al. 2019

ApJ

Self Cite

View full text Add to dashboard Cite

We explore X-ray evidence for the presence of active galactic nuclei (AGNs) in the two most actively star-forming Green Pea galaxies (GPs), SDSS J0749+3337 and SDSS J0822+2241, which have starformation rates (SFRs) of 123 M ⊙ yr −1 and 78 M ⊙ yr −1 , respectively. The GPs have red mid-infrared (MIR) spectral energy distributions and higher 22 µm luminosities than expected from a proxy of the SFR (Hα luminosity), consistent with hosting AGNs with 2-10 keV luminosities of ∼ 10 44 erg s −1 .We thus obtain and analyze the first hard (> 10 keV) X-ray data observed with NuSTAR and archival XMM-Newton data below 10 keV. From the NuSTAR ≈20 ksec data, however, we find no significant hard X-ray emission. By contrast, soft X-ray emission with 0.5-8 keV luminosities of ≈ 10 42 erg s −1 is significantly detected in both targets, which can be explained only by star formation (SF). A possible reason for the lack of clear evidence is that a putative AGN torus absorbs most of the X-ray emission. Applying a smooth-density AGN torus model, we determine minimum hydrogen column densities along the equatorial plane (N eq H ) consistent with the non-detection. The results indicate N eq H 2×10 24 cm −2 for SDSS J0749+3337 and N eq H 5 × 10 24 cm −2 for SDSS J0822+2241. Therefore, the GPs may host such heavily obscured AGNs. Otherwise, no AGN exists and the MIR emission is ascribed to SF. Active SF in low-mass galaxies is indeed suggested to reproduce red MIR colors. This would imply that diagnostics based on MIR photometry data alone may misidentify such galaxies as AGNs.

show abstract

Suzaku Observations of Heavily Obscured (Compton-thick) Active Galactic Nuclei Selected by the Swift/BAT Hard X-Ray Survey

Cited by 31 publications

References 101 publications

The Complete Infrared View of Active Galactic Nuclei From the 70 Month Swift/Bat Catalog

The Complete Infrared View of Active Galactic Nuclei From the 70 Month Swift/Bat Catalog

Broad-band X-ray analysis of local mid-infrared-selected Compton-thick AGN candidates

A NuSTAR and XMM-Newton Study of the Two Most Actively Star-forming Green Pea Galaxies (SDSS J0749+3337 and SDSS J0822+2241)

Contact Info

Product

Resources

About