Details

Autor(en) / Beteiligte

• Silver, R.
• Torres-Albà, N.
• Zhao, X.
• Marchesi, S.
• Pizzetti, A.
• Ajello, M.
• Cusumano, G.
• Parola, V. La
• Segreto, A.
• Comastri, A.

Titel

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

Ist Teil von

• The Astrophysical journal, 2022-06, Vol.932 (1), p.43

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2022

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Abstract 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. 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.