The hard X-ray luminosity function from ASCA surveys

Y. Ueda; Masayuki Akiyama; K. Ohta; T. Miyaji

The hard X-ray luminosity function from ASCA surveys

Y. Ueda, Masayuki Akiyama, K. Ohta, T. Miyaji

Research output: Contribution to journal › Article › peer-review

Abstract

We summarize the nature of hard X-ray populations at "bright" fluxes > 10^-13 erg cm^-2 s^-1 (2-10 keV) from optical identification of ASCA surveys, and present results of the hard X-ray luminosity function (HXLF) of Active Galactic Nuclei (AGN). Combined with HEAO1 and Chandra surveys we construct a hard-band selected sample with extremely high degree of completeness (>95%), consisting of 228 AGNs over the flux range 10^-11 ∼ 3 × 10^-15 erg cm^-2 s^-1 (2-10 keV). We find evidence that the percentage of "type-II" AGNs decreases with the intrinsic luminosity. The intrinsic HXLF of the whole AGNs (including type-II AGNs) is well described with the pure luminosity evolution (PLE) model up to redshift of 3. Our results directly constrain the evolution of AGNs that produce a major part of the hard X-ray background.

Original language	English
Pages (from-to)	36-39
Number of pages	4
Journal	Astronomische Nachrichten
Volume	324
Issue number	1-2
Publication status	Published - 2003 Jan 1
Externally published	Yes

Keywords

Galaxies: active
Galaxies: evolution
X-rays

ASJC Scopus subject areas

Space and Planetary Science
Astronomy and Astrophysics

Cite this

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title = "The hard X-ray luminosity function from ASCA surveys",

abstract = "We summarize the nature of hard X-ray populations at {"}bright{"} fluxes > 10-13 erg cm-2 s-1 (2-10 keV) from optical identification of ASCA surveys, and present results of the hard X-ray luminosity function (HXLF) of Active Galactic Nuclei (AGN). Combined with HEAO1 and Chandra surveys we construct a hard-band selected sample with extremely high degree of completeness (>95%), consisting of 228 AGNs over the flux range 10-11 ∼ 3 × 10-15 erg cm-2 s-1 (2-10 keV). We find evidence that the percentage of {"}type-II{"} AGNs decreases with the intrinsic luminosity. The intrinsic HXLF of the whole AGNs (including type-II AGNs) is well described with the pure luminosity evolution (PLE) model up to redshift of 3. Our results directly constrain the evolution of AGNs that produce a major part of the hard X-ray background.",

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T1 - The hard X-ray luminosity function from ASCA surveys

AU - Ueda, Y.

AU - Akiyama, Masayuki

AU - Ohta, K.

AU - Miyaji, T.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - We summarize the nature of hard X-ray populations at "bright" fluxes > 10-13 erg cm-2 s-1 (2-10 keV) from optical identification of ASCA surveys, and present results of the hard X-ray luminosity function (HXLF) of Active Galactic Nuclei (AGN). Combined with HEAO1 and Chandra surveys we construct a hard-band selected sample with extremely high degree of completeness (>95%), consisting of 228 AGNs over the flux range 10-11 ∼ 3 × 10-15 erg cm-2 s-1 (2-10 keV). We find evidence that the percentage of "type-II" AGNs decreases with the intrinsic luminosity. The intrinsic HXLF of the whole AGNs (including type-II AGNs) is well described with the pure luminosity evolution (PLE) model up to redshift of 3. Our results directly constrain the evolution of AGNs that produce a major part of the hard X-ray background.

AB - We summarize the nature of hard X-ray populations at "bright" fluxes > 10-13 erg cm-2 s-1 (2-10 keV) from optical identification of ASCA surveys, and present results of the hard X-ray luminosity function (HXLF) of Active Galactic Nuclei (AGN). Combined with HEAO1 and Chandra surveys we construct a hard-band selected sample with extremely high degree of completeness (>95%), consisting of 228 AGNs over the flux range 10-11 ∼ 3 × 10-15 erg cm-2 s-1 (2-10 keV). We find evidence that the percentage of "type-II" AGNs decreases with the intrinsic luminosity. The intrinsic HXLF of the whole AGNs (including type-II AGNs) is well described with the pure luminosity evolution (PLE) model up to redshift of 3. Our results directly constrain the evolution of AGNs that produce a major part of the hard X-ray background.

KW - Galaxies: active

KW - Galaxies: evolution

KW - X-rays

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The hard X-ray luminosity function from ASCA surveys

Abstract

Keywords

ASJC Scopus subject areas

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