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Date and Time of the Query: 2019-06-18 T04:04:42 PDT
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For refcode 2002PASJ...54..695N:
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Copyright by Astronomical Society of Japan. 2002PASJ...54..695N A New Empirical Method for Estimating the Far-Infrared Flux of Galaxies Hirohisa NAGATA and Hiroshi SHIBAI Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602 hnagata@u.phys.nagoya-u.ac.jp Tsutomu T. TAKEUCHI National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 and Takashi ONAKA Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Received 2002 February 14; accepted 2002 August 7) Abstract We propose a new empirical method to estimate the total far-infrared flux of galaxies from the spectral energy distribution (SED) at wavelengths of {lambda} <= 100 microns. It is difficult to derive the total far-infrared luminosity from only the IRAS data, though it is one of the most important properties of galaxies. Observations by Infrared Telescope in Space (IRTS) indicate that the SED of the diffuse emission from the Galactic plane in this wavelength region can be derived from the 60 microns to 100 microns color. This empirical SED relation was improved in order to obtain a better fit to the Galactic plane data for I_{nu}_(60 microns)/I_{nu}_(100 microns) > 0.6, and applied to 96 IRAS galaxies for which ISOPHOT and KAO data are available at {lambda} > 100 microns. As a result, the empirical relation well describes the far-infrared (FIR) SED for a majority of galaxies. Additionally, the total FIR flux for {lambda} >= 40 microns was derived from the flux densities at 60 and 100 microns by using this model. For the 96 IRAS galaxies, the uncertainty in the total far-infrared flux of the present method is 26%. The present method is more accurate than the previous one widely used to derive the total infrared flux from the IRAS 60 and 100 microns data. Key Words: galaxies: ISM - galaxies: spiral - ISM: dust, extinction
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