In the BH-galaxy co-evolution framework, most of the star-formation (SF) and the black hole (BH) accretion is expected to take place in highly obscured conditions. Thus, obscured AGN are difficult to identify in optical or X-ray bands, but shine bright in the IR. Moreover, X-ray background (XRB) synthesis models predict that a large fraction of the yet-unresolved XRB is due to the most obscured (Compton thick, CT) of these AGN. In this work, we investigate the synergies between putative IR missions (using SPICA, proposed for ESA/M5 but withdrawn in October 2020, and Origins Space Telescope, OST, as `templates') and the X-ray mission Athena, which should fly in early 2030s, in detecting and characterizing AGN, with a particular focus on the most obscured ones. Using an XRB synthesis model, we estimated the number of AGN and the number of those which will be detected in the X-rays. For each AGN we associated an optical-to-FIR SED from observed AGN with both X-ray data and SED decomposition, and used these SEDs to check if the AGN will be detected by SPICA-like or OST at IR wavelengths. We expect that, with the deepest Athena and SPICA-like (or OST) surveys, we will be able to detect in the IR more than 90% of all the AGN (down to L2−10keV∼1042erg/s and up to z∼10) predicted by XRB synthesis modeling, and we will detect at least half of them in the X-rays. Athena will be extremely powerful in detecting and discerning moderate- and high-luminosity AGN. We find that the most obscured and elusive CT-AGN will be exquisitely sampled by SPICA-like mission or OST and that Athena will allow a fine characterization of the most-luminous ones. This will provide a significant step forward in the process of placing stronger constraints on the yet-unresolved XRB and investigating the BH accretion rate evolution up to very high redshift (z≥4).

The role of SPICA-like missions and the Origins Space Telescope in the quest for heavily obscured AGN and synergies with Athena / Barchiesi L.; Pozzi F.; Vignali C.; Carrera F.J.; Vito F.; Calura F.; Bisigello L.; Lanzuisi G.; Gruppioni C.; Lusso E.; Delvecchio I.; Negrello M.; Cooray A.; Feltre A.; Fernandez-Ontiveros J.A.; Gallerani S.; Kaneda H.; Oyabu S.; Pereira-Santaella M.; Piconcelli E.; Ricci C.; Rodighiero G.; Spinoglio L.; Tombesi F.. - In: PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA. - ISSN 1448-6083. - ELETTRONICO. - 38:(2021), pp. 0-0. [10.1017/pasa.2021.26]

The role of SPICA-like missions and the Origins Space Telescope in the quest for heavily obscured AGN and synergies with Athena

Lusso E.;
2021

Abstract

In the BH-galaxy co-evolution framework, most of the star-formation (SF) and the black hole (BH) accretion is expected to take place in highly obscured conditions. Thus, obscured AGN are difficult to identify in optical or X-ray bands, but shine bright in the IR. Moreover, X-ray background (XRB) synthesis models predict that a large fraction of the yet-unresolved XRB is due to the most obscured (Compton thick, CT) of these AGN. In this work, we investigate the synergies between putative IR missions (using SPICA, proposed for ESA/M5 but withdrawn in October 2020, and Origins Space Telescope, OST, as `templates') and the X-ray mission Athena, which should fly in early 2030s, in detecting and characterizing AGN, with a particular focus on the most obscured ones. Using an XRB synthesis model, we estimated the number of AGN and the number of those which will be detected in the X-rays. For each AGN we associated an optical-to-FIR SED from observed AGN with both X-ray data and SED decomposition, and used these SEDs to check if the AGN will be detected by SPICA-like or OST at IR wavelengths. We expect that, with the deepest Athena and SPICA-like (or OST) surveys, we will be able to detect in the IR more than 90% of all the AGN (down to L2−10keV∼1042erg/s and up to z∼10) predicted by XRB synthesis modeling, and we will detect at least half of them in the X-rays. Athena will be extremely powerful in detecting and discerning moderate- and high-luminosity AGN. We find that the most obscured and elusive CT-AGN will be exquisitely sampled by SPICA-like mission or OST and that Athena will allow a fine characterization of the most-luminous ones. This will provide a significant step forward in the process of placing stronger constraints on the yet-unresolved XRB and investigating the BH accretion rate evolution up to very high redshift (z≥4).
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Barchiesi L.; Pozzi F.; Vignali C.; Carrera F.J.; Vito F.; Calura F.; Bisigello L.; Lanzuisi G.; Gruppioni C.; Lusso E.; Delvecchio I.; Negrello M.; Cooray A.; Feltre A.; Fernandez-Ontiveros J.A.; Gallerani S.; Kaneda H.; Oyabu S.; Pereira-Santaella M.; Piconcelli E.; Ricci C.; Rodighiero G.; Spinoglio L.; Tombesi F.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/1281404
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