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Shuji Matsuura, Mai Shirahata, Mitsunobu Kawada, Yasuo Doi, Takao Nakagawa, Hiroshi Shibai, Chris P. Pearson, Toshinobu Takagi, Woong-Seob Jeong, Shinki Oyabu, Hideo Matsuhara, AKARI Far-Infrared Source Counts in the Lockman Hole, Publications of the Astronomical Society of Japan, Volume 59, Issue sp2, 10 October 2007, Pages S503–S513, https://doi.org/10.1093/pasj/59.sp2.S503
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Abstract
We report initial results of far-infrared observations of the Lockman Hole with Far-Infrared Surveyor onboard the AKARI infrared satellite. On the basis of slow-scan observations of a |$0\rlap{.}^{\circ}6 \times 1\rlap{.}^{\circ}2$| contiguous area, we obtained source number counts at 65, 90, and 140 |$\mu $|m down to 77, 26, and 194 mJy (3|$\sigma$|), respectively. The counts at 65 and 140 |$\mu $|m show good agreement with the Spitzer results. However, our 90 |$\mu $|m counts are clearly lower than the predicted counts by recent evolutionary models that fit the Spitzer counts in all the MIPS bands. Our 90 |$\mu $|m counts above 26 mJy account for about 7% of the cosmic background. These results provide strong constraints on the evolutionary scenario, and suggest that the current models may require modifications.
