Limits on the X-ray emission from several hyperluminous IRAS galaxies

R. J. Wilman; A. C. Fabian; R. M. Cutri; C. S. Crawford; W. N. Brandt

doi:10.1046/j.1365-8711.1998.02047.x

Limits on the X-ray emission from several hyperluminous IRAS galaxies

R. J. Wilman, A. C. Fabian, R. M. Cutri, C. S. Crawford, W. N. Brandt

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Abstract

We report long, pointed ROSAT HRI observations of the hyperluminous galaxies IRAS F00235+1024, F12514+1027, F14481+4454 and F14537+1950. Two of them are optically classified as Seyfert-like. No X-ray sources are detected at the positions of any of the objects, with a mean upper limit L_X/L_Bol ≃ 2.3 × 10^-4. This indicates that any active nuclei are either atypically weak at X-ray wavelengths or obscured by column densities N_H > 10²³ cm^-2. They differ markedly from 'ordinary' Seyfert 2 galaxies, bearing a closer resemblance in the soft X-ray band to composite Seyfert 2 galaxies or to some types of starburst.

Original language	English (US)
Pages (from-to)	L7-L10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	300
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.1998.02047.x
State	Published - Oct 11 1998

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1046/j.1365-8711.1998.02047.x

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title = "Limits on the X-ray emission from several hyperluminous IRAS galaxies",

abstract = "We report long, pointed ROSAT HRI observations of the hyperluminous galaxies IRAS F00235+1024, F12514+1027, F14481+4454 and F14537+1950. Two of them are optically classified as Seyfert-like. No X-ray sources are detected at the positions of any of the objects, with a mean upper limit LX/LBol ≃ 2.3 × 10-4. This indicates that any active nuclei are either atypically weak at X-ray wavelengths or obscured by column densities NH > 1023 cm-2. They differ markedly from 'ordinary' Seyfert 2 galaxies, bearing a closer resemblance in the soft X-ray band to composite Seyfert 2 galaxies or to some types of starburst.",

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doi = "10.1046/j.1365-8711.1998.02047.x",

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TY - JOUR

T1 - Limits on the X-ray emission from several hyperluminous IRAS galaxies

AU - Wilman, R. J.

AU - Fabian, A. C.

AU - Cutri, R. M.

AU - Crawford, C. S.

AU - Brandt, W. N.

PY - 1998/10/11

Y1 - 1998/10/11

N2 - We report long, pointed ROSAT HRI observations of the hyperluminous galaxies IRAS F00235+1024, F12514+1027, F14481+4454 and F14537+1950. Two of them are optically classified as Seyfert-like. No X-ray sources are detected at the positions of any of the objects, with a mean upper limit LX/LBol ≃ 2.3 × 10-4. This indicates that any active nuclei are either atypically weak at X-ray wavelengths or obscured by column densities NH > 1023 cm-2. They differ markedly from 'ordinary' Seyfert 2 galaxies, bearing a closer resemblance in the soft X-ray band to composite Seyfert 2 galaxies or to some types of starburst.

AB - We report long, pointed ROSAT HRI observations of the hyperluminous galaxies IRAS F00235+1024, F12514+1027, F14481+4454 and F14537+1950. Two of them are optically classified as Seyfert-like. No X-ray sources are detected at the positions of any of the objects, with a mean upper limit LX/LBol ≃ 2.3 × 10-4. This indicates that any active nuclei are either atypically weak at X-ray wavelengths or obscured by column densities NH > 1023 cm-2. They differ markedly from 'ordinary' Seyfert 2 galaxies, bearing a closer resemblance in the soft X-ray band to composite Seyfert 2 galaxies or to some types of starburst.

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Limits on the X-ray emission from several hyperluminous IRAS galaxies

Abstract

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