Piercing through Highly Obscured and Compton-thick AGNs in the Chandra Deep Fields. I. X-Ray Spectral and Long-term Variability Analyses

@article{Li2019PiercingTH,
  title={Piercing through Highly Obscured and Compton-thick AGNs in the Chandra Deep Fields. I. X-Ray Spectral and Long-term Variability Analyses},
  author={Junyao Li and Yongquan Xue and Mouyuan Sun and Teng Liu and Fabio Vito and William Nielsen Brandt and Thomas M. Hughes and Guang Yang and Paolo Tozzi and Shifu Zhu and Xue-Tang Zheng and Bin Luo and Chien-Ting J. Chen and Cristian Vignali and Roberto Gilli and Xinwen Shu},
  journal={The Astrophysical Journal},
  year={2019},
  volume={877}
}
We present a detailed X-ray spectral analysis of 1152 active galactic nuclei (AGNs) selected in the Chandra Deep Fields (CDFs), in order to identify highly obscured AGNs ( > ). By fitting spectra with physical models, 436 (38%) sources with are confirmed to be highly obscured, including 102 Compton-thick (CT) candidates. We propose a new hardness ratio measure of the obscuration level that can be used to select highly obscured AGN candidates. The completeness and accuracy of applying this… 

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References

SHOWING 1-10 OF 99 REFERENCES

REVEALING A POPULATION OF HEAVILY OBSCURED ACTIVE GALACTIC NUCLEI AT z ≈ 0.5–1 IN THE CHANDRA DEEP FIELD-SOUTH

Heavily obscured (NH ≳ 3 × 1023 cm−2) active galactic nuclei (AGNs) not detected even in the deepest X-ray surveys are often considered to be comparably numerous to the unobscured and moderately

Reliable Identification of Compton-thick Quasars at z ≈ 2: Spitzer Mid-Infrared Spectroscopy of HDF-oMD49

Many models that seek to explain the origin of the unresolved X-ray background predict that Compton-thick active galactic nuclei (AGNs) are ubiquitous at high redshift. However, few distant

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

We present a uniform broadband X-ray (0.5–100.0 keV) spectral analysis of 12 Swift/Burst Alert Telescope selected Compton-thick ( ) active galactic nuclei (CTAGNs) observed with Suzaku. The Suzaku

CHASING HIGHLY OBSCURED QSOs IN THE COSMOS FIELD

A large population of heavily obscured, Compton-thick active galactic nuclei (AGNs) is predicted by AGN synthesis models for the cosmic X-ray background and by the “relic” supermassive black hole

The Compton-thick AGN in the Chandra Deep Field North

We present X-ray spectral analysis of the brightest sources (f2−10 keV > 10 −15 erg cm −2 s −1 ) in the Chandra Deep Field North. Our sample consists of 222 sources; for the vast majority (171)

Searching for Compton-thick active galactic nuclei at z∼ 0.1

Using a suite of X-ray, mid-infrared (mid-IR) and optical active galactic nuclei (AGN) luminosity indicators, we search for Compton-thick AGNs with intrinsic LX > 10 42 erg s −1 at z ∼ 0.03–0.2, a

SUZAKU OBSERVATIONS OF MODERATELY OBSCURED (COMPTON-THIN) ACTIVE GALACTIC NUCLEI SELECTED BY SWIFT/BAT HARD X-RAY SURVEY

We report the results obtained by a systematic, broadband (0.5–150 keV) X-ray spectral analysis of moderately obscured (Compton-thin, 22 ≤ log N H < 24 ) active galactic nuclei (AGNs) observed with

COMPTON-THICK ACCRETION IN THE LOCAL UNIVERSE

Heavily obscured accretion is believed to represent an important stage in the growth of supermassive black holes and to play an important role in shaping the observed spectrum of the cosmic X-ray

X-RAY SPECTRAL CONSTRAINTS FOR z ≈ 2 MASSIVE GALAXIES: THE IDENTIFICATION OF REFLECTION-DOMINATED ACTIVE GALACTIC NUCLEI

We use the 4 Ms Chandra Deep Field-South (CDF-S) survey to place direct constraints on the ubiquity of z ≈ 2 heavily obscured active galactic nuclei (AGNs) in K < 22 BzK-selected galaxies.

Searching for highly obscured AGNs in the XMM-Newton serendipitous source catalog

The majority of active galactic nuclei (AGNs) are obscured by large amounts of absorbing material that makes them invisible at many wavelengths. X-rays, given their penetrating power, provide the
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