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The NuSTAR Extragalactic Surveys:The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-ray Background
- Source :
- Harrison, F A, Aird, J, Civano, F, Lansbury, G, Mullaney, J R, Ballantyne, D R, Alexander, D M, Stern, D, Ajello, M, Barret, D, Bauer, F E, Balokovic, M, Brandt, W N, Brightman, M, Boggs, S E, Christensen, F E, Comastri, A, Craig, W W, Moro, A D, Forster, K, Gandhi, P, Giommi, P, Grefenstette, B W, Hailey, C J, Hickox, R C, Hornstrup, A, Kitaguchi, T, Koglin, J, Luo, B, Madsen, K K, Mao, P H, Miyasaka, H, Mori, K, Perri, M, Pivovaroff, M, Puccetti, S, Rana, V, Treister, E, Walton, D, Westergaard, N J, Wik, D, Zappacosta, L, Zhang, W W & Zoglauer, A 2016, ' The NuSTAR Extragalactic Surveys : The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-ray Background ', Astrophysical Journal, vol. 831, no. 2 . https://doi.org/10.3847/0004-637X/831/2/185, NASA Astrophysics Data System, Harrison, F A, Aird, J, Civano, F, Lansbury, G, Mullaney, J R, Ballantyne, D R, Alexander, D M, Stern, D, Ajello, M, Barret, D, Christensen, F E, Hornstrup, A & Westergaard, N J S 2016, ' The Nustar Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-Ray Background ', Astrophysical Journal, vol. 831, no. 2, 185 . https://doi.org/10.3847/0004-637X/831/2/185, Astrophysical journal, 2016, Vol.831(2), pp.185 [Peer Reviewed Journal]
- Publication Year :
- 2016
-
Abstract
- We present the 3-8 keV and 8-24 keV number counts of active galactic nuclei (AGN) identified in the NuSTAR extragalactic surveys. NuSTAR has now resolved 33-39% of the X-ray background in the 8-24 keV band, directly identifying AGN with obscuring columns up to approximately 1e25 /cm2. In the softer 3-8 keV band the number counts are in general agreement with those measured by XMM-Newton and Chandra over the flux range 5e-15 < S(3 - 8 keV)/(erg/cm2/s) < 1e-12 probed by NuSTAR. In the hard 8-24 keV band NuSTAR probes fluxes over the range 2e-14 < S(8-24 keV)/(erg/cm2/s) < 1e-12, a factor of approximately 100 fainter than previous measurements. The 8-24 keV number counts match predictions from AGN population synthesis models, directly confirming the existence of a population of obscured and/or hard X-ray sources inferred from the shape of the integrated cosmic X-ray background. The measured NuSTAR counts lie significantly above simple extrapolation with a Euclidian slope to low flux of the Swift/BAT 15-55 keV number counts measured at higher fluxes S(15-55 keV) > 1e-11 erg/cm2/s, reflecting the evolution of the AGN population between the Swift/BAT local (z<br />8 pages; accepted by the Astrophysical Journal
- Subjects :
- Seyfert [Galaxies]
Active galactic nucleus
active [Galaxies]
010504 meteorology & atmospheric sciences
Physics::Instrumentation and Detectors
Astrophysics::High Energy Astrophysical Phenomena
galaxies: active
Population
X-ray background
FOS: Physical sciences
Flux
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Surveys
diffuse background [X-rays]
01 natural sciences
surveys
0103 physical sciences
education
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics
astro-ph.HE
education.field_of_study
COSMIC cancer database
Astrophysics::Instrumentation and Methods for Astrophysics
Astronomy and Astrophysics
galaxies: Seyfert
Redshift
galaxies [X-rays]
X-rays: galaxies
Space and Planetary Science
nuclei [Galaxies]
galaxies: nuclei
X-rays: diffuse background
Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Database :
- OpenAIRE
- Journal :
- Harrison, F A, Aird, J, Civano, F, Lansbury, G, Mullaney, J R, Ballantyne, D R, Alexander, D M, Stern, D, Ajello, M, Barret, D, Bauer, F E, Balokovic, M, Brandt, W N, Brightman, M, Boggs, S E, Christensen, F E, Comastri, A, Craig, W W, Moro, A D, Forster, K, Gandhi, P, Giommi, P, Grefenstette, B W, Hailey, C J, Hickox, R C, Hornstrup, A, Kitaguchi, T, Koglin, J, Luo, B, Madsen, K K, Mao, P H, Miyasaka, H, Mori, K, Perri, M, Pivovaroff, M, Puccetti, S, Rana, V, Treister, E, Walton, D, Westergaard, N J, Wik, D, Zappacosta, L, Zhang, W W & Zoglauer, A 2016, ' The NuSTAR Extragalactic Surveys : The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-ray Background ', Astrophysical Journal, vol. 831, no. 2 . https://doi.org/10.3847/0004-637X/831/2/185, NASA Astrophysics Data System, Harrison, F A, Aird, J, Civano, F, Lansbury, G, Mullaney, J R, Ballantyne, D R, Alexander, D M, Stern, D, Ajello, M, Barret, D, Christensen, F E, Hornstrup, A & Westergaard, N J S 2016, ' The Nustar Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-Ray Background ', Astrophysical Journal, vol. 831, no. 2, 185 . https://doi.org/10.3847/0004-637X/831/2/185, Astrophysical journal, 2016, Vol.831(2), pp.185 [Peer Reviewed Journal]
- Accession number :
- edsair.doi.dedup.....7efb5dd50aad2ccb93f1225568ddb2a2