Determination of the cosmic far-infrared background level with the ISOPHOT instrument (Research Note)

M. Juvela, K. Mattila, D. Lemke, U. Klaas, C. Leinert, C. Kiss

Research output: Contribution to journalArticle

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Abstract

Context. The cosmic infrared background (CIRB) consists mainly of the integrated light of distant galaxies. In the far-infrared the current estimates of its surface brightness are based on the measurements of the COBE satellite. Independent confirmation of these results is still needed from other instruments. Aims. In this paper we derive estimates of the far-infrared CIRB using measurements made with the ISOPHOT instrument aboard the ISO satellite. The results are used to seek further confirmation of the CIRB levels that have been derived, by various groups using the COBE data. Methods. We study three regions of very low cirrus emission. The surface brightness observed with the ISOPHOT instrument at 90, 150, and. 180 μm is correlated with hydrogen 21 cm line data from the Effelsberg radio telescope. Extrapolation to zero hydrogen column density gives an estimate for the sum. of extragalactic signal plus zodiacal light. The zodiacal light is subtracted using ISOPHOT data at shorter wavelengths. Thus, the resulting estimate of the far-infrared CIRB is based on ISO measurements alone. Results. In the range 150 to 180 μm, we obtain a CIRB value of 1.08 ± 0.32 ± 0.30 MJy sr-1 quoting statistical and systematic errors separately. In the 90 μm band, we obtain a 2-σ upper limit of 2.3 MJy sr-1. Conclusions. The estimates derived from. ISOPHOT far-infrared maps are consistent with the earlier COBE results.

Original languageEnglish
Pages (from-to)763-768
Number of pages6
JournalAstronomy and Astrophysics
Volume500
Issue number2
DOIs
Publication statusPublished - Jun 2009

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background level
Cosmic Background Explorer satellite
zodiacal light
estimates
hydrogen
cirrus
brightness
radio
wavelength
radio telescopes
systematic errors
extrapolation
galaxies
wavelengths

Keywords

  • Cosmology, observations -
  • Galaxies, evolution -
  • Infrared, galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Determination of the cosmic far-infrared background level with the ISOPHOT instrument (Research Note). / Juvela, M.; Mattila, K.; Lemke, D.; Klaas, U.; Leinert, C.; Kiss, C.

In: Astronomy and Astrophysics, Vol. 500, No. 2, 06.2009, p. 763-768.

Research output: Contribution to journalArticle

Juvela, M. ; Mattila, K. ; Lemke, D. ; Klaas, U. ; Leinert, C. ; Kiss, C. / Determination of the cosmic far-infrared background level with the ISOPHOT instrument (Research Note). In: Astronomy and Astrophysics. 2009 ; Vol. 500, No. 2. pp. 763-768.
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AU - Kiss, C.

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AB - Context. The cosmic infrared background (CIRB) consists mainly of the integrated light of distant galaxies. In the far-infrared the current estimates of its surface brightness are based on the measurements of the COBE satellite. Independent confirmation of these results is still needed from other instruments. Aims. In this paper we derive estimates of the far-infrared CIRB using measurements made with the ISOPHOT instrument aboard the ISO satellite. The results are used to seek further confirmation of the CIRB levels that have been derived, by various groups using the COBE data. Methods. We study three regions of very low cirrus emission. The surface brightness observed with the ISOPHOT instrument at 90, 150, and. 180 μm is correlated with hydrogen 21 cm line data from the Effelsberg radio telescope. Extrapolation to zero hydrogen column density gives an estimate for the sum. of extragalactic signal plus zodiacal light. The zodiacal light is subtracted using ISOPHOT data at shorter wavelengths. Thus, the resulting estimate of the far-infrared CIRB is based on ISO measurements alone. Results. In the range 150 to 180 μm, we obtain a CIRB value of 1.08 ± 0.32 ± 0.30 MJy sr-1 quoting statistical and systematic errors separately. In the 90 μm band, we obtain a 2-σ upper limit of 2.3 MJy sr-1. Conclusions. The estimates derived from. ISOPHOT far-infrared maps are consistent with the earlier COBE results.

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