The demographics of obscured AGN from X-ray spectroscopy guided by multiwavelength information
| العنوان: | The demographics of obscured AGN from X-ray spectroscopy guided by multiwavelength information |
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| المؤلفون: | Brivael Laloux, Antonis Georgakakis, Carolina Andonie, David M Alexander, Angel Ruiz, David J Rosario, James Aird, Johannes Buchner, Francisco J Carrera, Andrea Lapi, Cristina Ramos Almeida, Mara Salvato, Francesco Shankar |
| المساهمون: | Universidad de Cantabria |
| المصدر: | Monthly Notices of the Royal Astronomical Society, 2023, 518(2), 2546-2566 Monthly Notices of the Royal Astronomical Society, 2023, Vol.518(2), pp.2546-2566 [Peer Reviewed Journal] Laloux, B, Georgakakis, A, Andonie, C, Alexander, D M, Ruiz, A, Rosario, D J, Aird, J, Buchner, J, Carrera, F J, Lapi, A, Almeida, C R, Salvato, M & Shankar, F 2023, ' The demographics of obscured AGN from X-ray spectroscopy guided by multiwavelength information ', Monthly Notices of the Royal Astronomical Society, vol. 518, no. 2, pp. 2546-2566 . https://doi.org/10.1093/mnras/stac3255Test |
| بيانات النشر: | Oxford University Press (OUP), 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Quasars: general, general [quasars], Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), general [X-rays], active [galaxies], FOS: Physical sciences, Astronomy and Astrophysics, Galaxies: active, Infrared: galaxies, X-rays: general, galaxies [infrared], Astrophysics - Astrophysics of Galaxies |
| الوصف: | A complete census of Active Galactic Nuclei (AGN) is a prerequisite for understanding the growth of supermassive black holes across cosmic time. A significant challenge toward this goal is the whereabouts of heavily obscured AGN that remain uncertain. This paper sets new constraints on the demographics of this population by developing a methodology that combines X-ray spectral information with priors derived from multiwavelength observations. We select X-ray AGN in the Chandra COSMOS Legacy survey and fit their $2.2-500\mu m$ spectral energy distributions with galaxy and AGN templates to determine the mid-infrared ($6\mu m$) luminosity of the AGN component. Empirical correlations between X-ray and $6\mu m$ luminosities are then adopted to infer the intrinsic accretion luminosity at X-rays for individual AGN. This is used as prior information in our Bayesian X-ray spectral analysis to estimate physical properties, such as line-of-sight obscuration. Our approach breaks the degeneracies between accretion luminosity and obscuration that affect X-ray spectral analysis, particularly for the most heavily obscured (Compton-Thick) AGN with low photon counts X-ray spectra. The X-ray spectral results are then combined with the selection function of the Chandra COSMOS Legacy survey to derive the AGN space density and a Compton-Thick fraction of $21.0^{+16.1}_{-9.9}\%$ at redshifts $z Comment: Accepted for publication at MNRAS, 21 pages, 20 figures, 6 tables |
| وصف الملف: | application/pdf; text |
| تدمد: | 1365-2966 0035-8711 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc87a0be7889a0cf034264afd0039673Test https://doi.org/10.1093/mnras/stac3255Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....cc87a0be7889a0cf034264afd0039673 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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