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The DOI matches its Crossref record; 42 of the 42 references it cites were found in a registry or an index.

Spectral Energy Distributions of Hard X‐Ray Selected Active Galactic Nuclei in the XMM‐Newton Medium Deep Survey

Open access
Polletta, M., Tajer, M., Maraschi, L., Trinchieri, G., Lonsdale, C. J., Chiappetti, L., Andreon, S., Pierre, M., Le Fevre, O., Zamorani, G., Maccagni, D., Garcet, O., Surdej, J., Franceschini, A., Alloin, D., Shupe, D. L., Surace, J. A., Fang, F., Rowan‐Robinson, M., Smith, H. E., Tresse, L.·2007·The Astrophysical Journal
DOI 10.1086/518113
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Abstract

We present the SEDs of a hard X-ray selected sample containing 136 sources with F 2-10 keV > 10 -14 erg cm -2 s -1 ; 132 are AGNs. The sources are detected in a 1 deg 2 area of the XMM-Newton Medium Deep Survey where optical data from the VVDS and CFHTLS and infrared data from the SWIRE survey are available. Based on a SED fitting technique we derive photometric redshifts with σ(1 + z ) = 0.11 and 6% of outliers and identify AGN signatures in 83% of the objects. This fraction is higher than derived when a spectroscopic classification is available. The remaining 17 % of AGNs show star-forming galaxy SEDs (SF class). The sources with AGN signatures are divided in two classes, AGN1 (33 %) and AGN2 (50 %). The AGN1 and AGN2 classes include sources whose SEDs are fitted by type 1 and type 2 AGN templates, respectively. On average, AGN1s show soft X-ray spectra, consistent with being unabsorbed, while AGN2s and SFs show hard X-ray spectra, consistent with being absorbed. The analysis of the average SEDs as a function of X-ray luminosity shows a reddening of the infrared SEDs, consistent with a decreasing contribution from the host galaxy at higher luminosities. The AGNs in the SF classes are likely obscured in the mid-infrared, as suggested by their low L 3-20 μm / L ratios. We confirm the previously found correlation for AGNs between the radio luminosity and the X-ray and the mid-infrared luminosities. The X-ray-radio correlation can be used to identify heavily absorbed AGNs. However, the estimated radio fluxes for the missing AGN population responsible for the bulk of the background at E > 10 keV are too faint to be detected even in the deepest current radio surveys.

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Metadata

Authors
Polletta, M., Tajer, M., Maraschi, L., Trinchieri, G., Lonsdale, C. J., Chiappetti, L., Andreon, S., Pierre, M., Le Fevre, O., Zamorani, G., Maccagni, D., Garcet, O., Surdej, J., Franceschini, A., Alloin, D., Shupe, D. L., Surace, J. A., Fang, F., Rowan‐Robinson, M., Smith, H. E., & Tresse, L.
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2007-07
Volume
663
Issue
1
Pages
81-102
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1086/518113
OpenAlex
W2027297109
Cited by
869
References
42
FWCI
24.56
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Spectral Energy Distributions of Hard X‐Ray Selected Active Galactic Nuclei in the XMM‐Newton Medium Deep Survey. https://app.cochat.ai/papers/10.1086/518113
The paper
Polletta, M., Tajer, M., Maraschi, L., Trinchieri, G., Lonsdale, C. J., Chiappetti, L., Andreon, S., Pierre, M., Le Fevre, O., Zamorani, G., Maccagni, D., Garcet, O., Surdej, J., Franceschini, A., Alloin, D., Shupe, D. L., Surace, J. A., Fang, F., Rowan‐Robinson, M., . . . Tresse, L. (2007). Spectral Energy Distributions of Hard X‐Ray Selected Active Galactic Nuclei in the XMM‐Newton Medium Deep Survey. The Astrophysical Journal. https://doi.org/10.1086/518113

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.