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Resolving the cosmic X-ray background with a next-generation high-energy X-ray observatory

Hickox, R. C. and Civano, F. and Ballantyne, D. R. and Baloković, M. and Boorman, P. G. and Brandt, W. N. and Canning, R. E. A. and Fornasini, F. and Gandhi, P. and Jones, M. L. and Lansbury, G. B. and Lanz, L. and Lanzuisi, G. and Madsen, K. K. and Marchesi, S. and Masini, A. and Ananna, T. and Stern, D. and Ricci, C. (2019) Resolving the cosmic X-ray background with a next-generation high-energy X-ray observatory. Astro2020 Science White Paper, . (Unpublished) http://resolver.caltech.edu/CaltechAUTHORS:20190619-095513937

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Abstract

The cosmic X-ray background (CXB), which peaks at an energy of ≈30 keV, is produced primarily by emission from accreting supermassive black holes (SMBHs). The CXB therefore serves as a constraint on the integrated SMBH growth in the Universe and the accretion physics and obscuration in active galactic nuclei (AGNs). This paper gives an overview of recent progress in understanding the high-energy (>~10 keV) X-ray emission from AGNs and the synthesis of the CXB, with an emphasis on results from NASA's NuSTAR hard X-ray mission. We then discuss remaining challenges and open questions regarding the nature of AGN obscuration and AGN physics. Finally, we highlight the exciting opportunities for a next-generation, high-resolution hard X-ray mission to achieve the long-standing goal of resolving and characterizing the vast majority of the accreting SMBHs that produce the CXB.


Item Type:Report or Paper (White Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1905.11439arXivDiscussion Paper
ORCID:
AuthorORCID
Hickox, R. C.0000-0003-1468-9526
Civano, F.0000-0002-2115-1137
Ballantyne, D. R.0000-0001-8128-6976
Boorman, P. G.0000-0001-9379-4716
Brandt, W. N.0000-0002-0167-2453
Fornasini, F.0000-0002-9286-9963
Gandhi, P.0000-0003-3105-2615
Lansbury, G. B.0000-0002-5328-9827
Lanz, L.0000-0002-3249-8224
Lanzuisi, G.0000-0001-9094-0984
Madsen, K. K.0000-0003-1252-4891
Marchesi, S.0000-0001-5544-0749
Masini, A.0000-0002-7100-9366
Stern, D.0000-0003-2686-9241
Ricci, C.0000-0001-5231-2645
Group:Space Radiation Laboratory
Record Number:CaltechAUTHORS:20190619-095513937
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190619-095513937
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96552
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Jun 2019 17:11
Last Modified:11 Jul 2019 17:09

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