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2001•Astronomy and AstrophysicsOpen access

ISO continuum observations of quasars at ${z=1{-}4}$

Shinki Oyabu, Kimiaki Kawara, Y. Tsuzuki, Yoshiaki Sofue, Yasunori Sato, H. Okuda, Yuki Taniguchi, H. Shibai, C. Gabriel, T. Hasegawa, Eiji Nishihara

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Abstract

Eight luminous quasars with at have been observed in the mid- and far-infrared using ISO. All the quasars have been detected in the mid-infrared bands of ISOCAM, while no far-infrared detections have been made with ISOPHOT. SEDs (Spectral Energy Distributions) from the UV to far-infrared have been obtained while supplementing ISO observations with photometry in the optical and near-infrared made from the ground within 17 months. The SEDs are compared with the MED (Mean spectral Energy Distributions) of low-redshift quasars with . It is shown that our far-infrared observations were limited by confusion noise due to crowded sources.

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What this paper is about

Eight luminous quasars with at have been observed in the mid- and far-infrared using ISO. All the quasars have been detected in the mid-infrared bands of ISOCAM, while no far-infrared detections have been made with ISOPHOT. SEDs (Spectral Energy Distributions) from the UV to far-infrared have been obtained while supplementing ISO observations with photometry in the optical and near-infrared made from the ground within 17 months. The SEDs are compared with the MED (Mean spectral Energy Distributions) of low-redshift quasars with . It is shown that our far-infrared observations were limited by confusion noise due to crowded sources.

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Available abstract

Eight luminous quasars with at have been observed in the mid- and far-infrared using ISO. All the quasars have been detected in the mid-infrared bands of ISOCAM, while no far-infrared detections have been made with ISOPHOT. SEDs (Spectral Energy Distributions) from the UV to far-infrared have been obtained while supplementing ISO observations with photometry in the optical and near-infrared made from the ground within 17 months. The SEDs are compared with the MED (Mean spectral Energy Distributions) of low-redshift quasars with . It is shown that our far-infrared observations were limited by confusion noise due to crowded sources.

Key concepts: Quasar, Physics, Astrophysics, Astronomy, Galaxy

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