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1999•Monthly Notices of the Royal Astronomical SocietyOpen access

The ROSAT Wide Field Camera Extragalactic Survey

Rick Edelson, S. Vaughan, R. S. Warwick, E. M. Puchnarewicz, Ian M. George

Open full text 45 citations

Abstract

We report the results of a new analysis of the ROSAT Wide Field Camera (WFC) all-sky survey data, designed to detect extragalactic sources of extreme ultraviolet (EUV) radiation in regions of low Galactic NH. We identify a total of 19 active galactic nuclei (AGN), more than double the number of confirmed AGN in the published WFC (2RE) survey. Our sample contains eight narrow-line Seyfert 1 galaxies, making this the first reasonably sized, complete sample of these extreme AGN, along with six broad-line Seyfert 1s and five BL Lacertae objects. These EUV-selected sources typically have steep soft X-ray spectra with a mean power-law energy index αX≈-2. The derived AGN luminosity function is rather flat and a pears to cut off above a luminosity of 1046 erg s−1 keV−1, measured monochromatically at 200 eV. Narrow-line Seyfert 1s account for roughly half of the local (z≈ 0) volume emissivity in the EUV band.

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We report the results of a new analysis of the ROSAT Wide Field Camera (WFC) all-sky survey data, designed to detect extragalactic sources of extreme ultraviolet (EUV) radiation in regions of low Galactic NH. We identify a total of 19 active galactic nuclei (AGN), more than double the number of confirmed AGN in the published WFC (2RE) survey. Our sample contains eight narrow-line Seyfert 1 galaxies, making this the first reasonably sized, complete sample of these extreme AGN, along with six broad-line Seyfert 1s and five BL Lacertae objects. These EUV-selected sources typically have steep soft X-ray spectra with a mean power-law energy index αX≈-2. The derived AGN luminosity function is rather flat and a pears to cut off above a luminosity of 1046 erg s−1 keV−1, measured monochromatically at 200 eV. Narrow-line Seyfert 1s account for roughly half of the local (z≈ 0) volume emissivity in the EUV band.

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Available abstract

We report the results of a new analysis of the ROSAT Wide Field Camera (WFC) all-sky survey data, designed to detect extragalactic sources of extreme ultraviolet (EUV) radiation in regions of low Galactic NH. We identify a total of 19 active galactic nuclei (AGN), more than double the number of confirmed AGN in the published WFC (2RE) survey. Our sample contains eight narrow-line Seyfert 1 galaxies, making this the first reasonably sized, complete sample of these extreme AGN, along with six broad-line Seyfert 1s and five BL Lacertae objects. These EUV-selected sources typically have steep soft X-ray spectra with a mean power-law energy index αX≈-2. The derived AGN luminosity function is rather flat and a pears to cut off above a luminosity of 1046 erg s−1 keV−1, measured monochromatically at 200 eV. Narrow-line Seyfert 1s account for roughly half of the local (z≈ 0) volume emissivity in the EUV band.

Key concepts: Physics, ROSAT, Astrophysics, Galaxy, Active galactic nucleus, Luminosity, Luminosity function, Extreme ultraviolet lithography

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