Compton-Thick AGN in the NuSTAR ERA VII. A joint NuSTAR, Chandra, and XMM-Newton Analysis of Two Nearby, Heavily Obscured Sources

Traina, A.; Marchesi, S.; Vignali, C.; Torres-Albà, N.; Ajello, M.; Pizzetti, A.; Silver, R.; Zhao, X.; Ananna, Tonima Tasnim; Baloković, Mislav; Boorman, Peter; Gandhi, P.; Gilli, R.; Lanzuisi, G.

doi:10.3847/1538-4357/ac1fee

Cited by 12 publications

(13 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, Asmus et al ( 2015) used a sample of 152 AGN with reliable soft X-ray data to model a trend between the intrinsic 2−10 keV luminosity and the 12µm luminosity (see Figure 3). In addition, we have plotted the intrinsic (closed circles) and observed (open circles) X-ray luminosities of the sources in this work, and those of recently confirmed CT-AGN (Marchesi et al 2019;Zhao et al 2019a,b;Torres-Albà et al 2021;Traina et al 2021). The two green stars represent the candidate CT-AGN presented in this work, 2MASX J02051994−0233055 and IRAS 11058−1131.…”

Section: Mid-ir Comparisonmentioning

confidence: 88%

“…We take advantage of our high-resolution Chandra images and attempt to detect the cone emission in the highly obscured sources presented in this work. In order to do so, we extract radial profiles from all of our sources and compare them to the expected radial profile The blue circles are recently confirmed CT-AGN (Marchesi et al 2019;Zhao et al 2019a,b;Torres-Albà et al 2021;Traina et al 2021). The grey area represents a 25× (or more) decrease in X-ray flux, a diagnostic used to identify CT-AGN (Annuar et al 2020).…”

Section: Study Of Extended Emissionmentioning

confidence: 99%

“…The green stars are the two candidate CT-AGN presented in this work, 2MASX J02051994−0233055 and IRAS 11058−1131. The black line is the relation derived from the X-ray observations of a reliable sample of 152 AGN presented in Asmus et al (2015).The blue circles are recently confirmed CT-AGN(Marchesi et al 2019; Zhao et al 2019a,b;Torres- Albà et al 2021;Traina et al 2021). The grey area represents a 25× (or more) decrease in X-ray flux, a diagnostic used to identify CT-AGN(Annuar et al 2020).…”

mentioning

confidence: 96%

See 2 more Smart Citations

Chandra Follow-up Observations of Swift-BAT-selected AGNs II

Silver,

Torres-Alba,

Zhao

et al. 2022

Preprint

View full text Add to dashboard Cite

We present the combined Chandra and Swift-BAT spectral analysis of nine low-redshift (z ≤ 0.10), candidate heavily obscured active galactic nuclei (AGN) selected from the Swift-BAT 150-month catalog. We located soft (1−10 keV) X-ray counterparts to these BAT sources and joint fit their spectra with physically motivated models. The spectral analysis in the 1−150 keV energy band determined that all sources are obscured, with a line-of-sight column density N H ≥ 10 22 cm −2 at a 90% confidence level. Four of these sources show significant obscuration with N H ≥ 10 23 cm −2 and two additional sources are candidate Compton-thick Active Galactic Nuclei (CT-AGNs) with N H ≥ 10 24 cm −2 . These two sources, 2MASX J02051994-0233055 and IRAS 11058−1131, are the latest addition to the previous 3 CT-AGN candidates found using our strategy for soft X-ray follow-up of BAT sources. In here we present the results of our methodology so far, and analyze the effectiveness of applying different selection criteria to discover CT-AGN in the local Universe. Our selection criteria has a ∼20% success rate of discovering heavily obscured AGN whose CT nature is confirmed by follow-up NuSTAR observations. This is much higher than the ∼5% found in blind surveys.

show abstract

Section: Mid-ir Comparisonmentioning

confidence: 88%

Section: Study Of Extended Emissionmentioning

confidence: 99%

mentioning

confidence: 96%

See 1 more Smart Citation

Chandra Follow-up Observations of Swift-BAT-selected AGNs II

Silver,

Torres-Alba,

Zhao

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…They used this to model a trend between the intrinsic 2−10 keV luminosity and the 12 μm luminosity (see Figure 3). In addition, we have plotted the intrinsic (solid circles) and observed (open circles) X-ray luminosities of the sources in this work, and those of recently confirmed CT-AGN (Marchesi et al 2019;Zhao et al 2019aZhao et al , 2019bTorres-Albà et al 2021;Traina et al 2021). The two green stars represent the candidate CT-AGN presented in this work, 2MASX J02051994 −0233055 and IRAS 11058−1131.…”

Section: Mid-ir Comparisonmentioning

confidence: 98%

“…The green stars are the two candidate CT-AGN presented in this work, 2MASX J02051994−0233055 and IRAS 11058-1131. The black line is the relation derived from the X-ray observations of a reliable sample of 152 AGN presented in Asmus et al (2015).The blue circles are recently confirmed CT-AGN(Marchesi et al 2019;Zhao et al 2019aZhao et al , 2019bTorres-Albà et al 2021;Traina et al 2021). The gray area represents a 25× (or more) decrease in X-ray flux, a diagnostic used to identify CT-AGN(Annuar et al 2020).…”

mentioning

confidence: 92%

Chandra Follow-up Observations of Swift-BAT-selected AGNs II

Silver

Torres-Albà

Zhao

et al. 2022

ApJ

Self Cite

View full text Add to dashboard Cite

We present the combined Chandra and Swift-BAT spectral analysis of nine low-redshift (z ≤ 0.10), candidate heavily obscured active galactic nuclei (AGN) selected from the Swift-BAT 150 month catalog. We located soft (1−10 keV) X-ray counterparts to these BAT sources and joint fit their spectra with physically motivated models. The spectral analysis in the 1−150 keV energy band determined that all sources are obscured, with a line-of-sight column density N H ≥ 1022 cm−2 at a 90% confidence level. Four of these sources show significant obscuration with N H ≥ 1023 cm−2 and two additional sources are candidate Compton-thick Active Galactic Nuclei (CT-AGNs) with N H ≥ 1024 cm−2. These two sources, 2MASX J02051994–0233055 and IRAS 11058−1131, are the latest addition to the previous 3 CT-AGN candidates found using our strategy for soft X-ray follow-up of BAT sources. Here we present the results of our methodology so far, and analyze the effectiveness of applying different selection criteria to discover CT-AGN in the local Universe. Our selection criteria has an ∼20% success rate of discovering heavily obscured AGN whose CT nature is confirmed by follow-up NuSTAR observations. This is much higher than the ∼5% found in blind surveys.

show abstract

Compton-thick AGN in the NuSTAR Era X: Analysing seven local CT-AGN candidates

Sengupta¹,

Marchesi²,

Vignali³

et al. 2023

A&A

View full text Add to dashboard Cite

Context. We present the broad-band X-ray spectral analysis (0.6–50 keV) of seven Compton-thick active galactic nuclei (CT-AGN; line-of-sight (LOS) column density > 1024 cm−2) candidates selected from the Swift-BAT 100 month catalogue using archival NuSTAR data. Aims. We aim to obtain a complete census of the heavily obscured AGN in the local Universe (z < 0.05). Methods. This work is in continuation of the ongoing research of the Clemson-INAF group to classify CT-AGN candidates at redshift z < 0.05 using physically motivated torus models. Results. Our results confirm that three out of seven targets are bona fide CT-AGN. Adding our results to the previously analysed sources using NuSTAR data, we increase the population of bona fide CT-AGN by ∼9%, bringing the total number to 35 out of 414 AGN. We also performed a comparative study using MYTorus and borus02 on the spectra in our sample, finding that both physical models are strongly consistent in the parameter space of LOS column density and photon index. Furthermore, we also investigate the clumpiness of the torus clouds by separately computing the LOS and average torus column densities in each of the seven sources. Adding our results to all the previous 48 CT-AGN candidates analysed by the Clemson-INAF research team for which NuSTAR observations are available, we find that 78% of the sources are likely to have a clumpy distribution of the obscuring material surrounding the accreting supermassive black hole.

show abstract

Compton-Thick AGN in the NuSTAR ERA VII. A joint NuSTAR, Chandra, and XMM-Newton Analysis of Two Nearby, Heavily Obscured Sources

Cited by 12 publications

References 50 publications

Chandra Follow-up Observations of Swift-BAT-selected AGNs II

Chandra Follow-up Observations of Swift-BAT-selected AGNs II

Chandra Follow-up Observations of Swift-BAT-selected AGNs II

Compton-thick AGN in the NuSTAR Era X: Analysing seven local CT-AGN candidates

Contact Info

Product

Resources

About