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Constraints on Far-Infrared Source Counts in the Lockman Hole using a Power Spectrum Analysis

Published online by Cambridge University Press:  13 May 2016

H. Matsuhara ,
K. Kawara ,
Y. Sofue ,
Y. Taniguchi ,
Y. Sato ,
H. Okuda ,
T. Matsumoto ,
K. Wakamatsu ,
L. L. Cowie  and
R. D. Joseph
...Show all authors
H. Matsuhara
Affiliation:
Institute of Space and Astronautical Science, Kanagawa, 229 Japan
K. Kawara
Affiliation:
Institute of Astronomy, The University of Tokyo, Tokyo, 181–8588, Japan
Y. Sofue
Affiliation:
Institute of Astronomy, The University of Tokyo, Tokyo, 181–8588, Japan
Y. Taniguchi
Affiliation:
Astronomical Institute, Tohoku University, Sendai 980–8578, Japan
Y. Sato
Affiliation:
The Institute of Space and Astronautical Science, Kanagawa, 229–8510, Japan
H. Okuda
Affiliation:
The Institute of Space and Astronautical Science, Kanagawa, 229–8510, Japan
T. Matsumoto
Affiliation:
The Institute of Space and Astronautical Science, Kanagawa, 229–8510, Japan
K. Wakamatsu
Affiliation:
Faculty of Engineering, Gifu University, Gifu 501–1193, Japan
L. L. Cowie
Affiliation:
Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA
R. D. Joseph
Affiliation:
Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA
D. B. Sanders
Affiliation:
Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA

Abstract

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We present the characteristics of far-infrared (FIR) brightness fluctuations at 90 μm and 170 μm in the Lockman Hole, which were surveyed with the ISOPHOT instrument aboard the Infrared Space Observatory (ISO), and give constraints on the galaxy number counts down to 30 mJy at 90 μm and 50 mJy at 170 μm. The fluctuation power spectra of the FIR images are not dominated by IR cirrus, and are instead most likely due to star-forming galaxies. This analysis indicates the existence of strong evolution in the counts. Especially at 90 μm, the source density is much larger than that expected from the currently available galaxy count models. The galaxies responsible for the fluctuations also significantly contribute to the cosmic infrared background radiation recently derived from an analysis of the COBE data.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 204: The Extragalactic Infrared Background and its Cosmological Implication , 2001 , pp. 301
Copyright
Copyright © Astronomical Society of the Pacific 2001