X-ray emission from Starburst galaxies

Yoel Rephaeli; Duane Gruber; Massimo Persic; Dan MacDonald

doi:10.1086/186173

X-ray emission from Starburst galaxies

Yoel Rephaeli^*, Duane Gruber, Massimo Persic, Dan MacDonald

^*Corresponding author for this work

School of Physics and Astronomy

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

27 Scopus citations

Abstract

We report the results of an investigation of X-ray emission from a sample of 53 IRAS-selected candidate starburst galaxies. Superposed soft and hard X-ray emission from these galaxies in the Einstein IPC and HEAO 1 A-2 and A-4 energy bands, which span 0.5 to 160 keV, is detected at the 99.6% confidence level, after allowing for confusion noise in the HEAO 1 data. Above 15 keV the confidence level is 97%. The combined spectrum is flat, with a (photon) power-law index of 1.0 ± 0.3. The contribution of the population of sources represented by this sample to the 3-50 keV residual cosmic X-ray background is estimated to be at least ∼4% assuming no evolution. Moderate evolution, for which there is some observational evidence, increases this fractional contribution to ∼26%.

Original language	English
Pages (from-to)	L59-L62
Journal	Astrophysical Journal
Volume	380
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/186173
State	Published - 20 Oct 1991

Keywords

Galaxies: X-rays
X-rays: sources

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10.1086/186173

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abstract = "We report the results of an investigation of X-ray emission from a sample of 53 IRAS-selected candidate starburst galaxies. Superposed soft and hard X-ray emission from these galaxies in the Einstein IPC and HEAO 1 A-2 and A-4 energy bands, which span 0.5 to 160 keV, is detected at the 99.6% confidence level, after allowing for confusion noise in the HEAO 1 data. Above 15 keV the confidence level is 97%. The combined spectrum is flat, with a (photon) power-law index of 1.0 ± 0.3. The contribution of the population of sources represented by this sample to the 3-50 keV residual cosmic X-ray background is estimated to be at least ∼4% assuming no evolution. Moderate evolution, for which there is some observational evidence, increases this fractional contribution to ∼26%.",

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AU - Rephaeli, Yoel

AU - Gruber, Duane

AU - Persic, Massimo

AU - MacDonald, Dan

PY - 1991/10/20

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N2 - We report the results of an investigation of X-ray emission from a sample of 53 IRAS-selected candidate starburst galaxies. Superposed soft and hard X-ray emission from these galaxies in the Einstein IPC and HEAO 1 A-2 and A-4 energy bands, which span 0.5 to 160 keV, is detected at the 99.6% confidence level, after allowing for confusion noise in the HEAO 1 data. Above 15 keV the confidence level is 97%. The combined spectrum is flat, with a (photon) power-law index of 1.0 ± 0.3. The contribution of the population of sources represented by this sample to the 3-50 keV residual cosmic X-ray background is estimated to be at least ∼4% assuming no evolution. Moderate evolution, for which there is some observational evidence, increases this fractional contribution to ∼26%.

AB - We report the results of an investigation of X-ray emission from a sample of 53 IRAS-selected candidate starburst galaxies. Superposed soft and hard X-ray emission from these galaxies in the Einstein IPC and HEAO 1 A-2 and A-4 energy bands, which span 0.5 to 160 keV, is detected at the 99.6% confidence level, after allowing for confusion noise in the HEAO 1 data. Above 15 keV the confidence level is 97%. The combined spectrum is flat, with a (photon) power-law index of 1.0 ± 0.3. The contribution of the population of sources represented by this sample to the 3-50 keV residual cosmic X-ray background is estimated to be at least ∼4% assuming no evolution. Moderate evolution, for which there is some observational evidence, increases this fractional contribution to ∼26%.

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KW - X-rays: sources

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X-ray emission from Starburst galaxies

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Keywords

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