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Astron. Astrophys. 336, L9-L12 (1998)

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Letter to the Editor

ISO deep far-infrared survey in the "Lockman Hole"

A search for obscured objects at high redshift. I. Observations

K. Kawara 1, 2, 3, Y. Sato 2, 3, 4, H. Matsuhara 2, 5, Y. Taniguchi 4, H. Okuda  2, Y. Sofue  1, T. Matsumoto 2, K. Wakamatsu 6, H. Karoji 7, S. Okamura 8, K.C. Chambers 9, L.L. Cowie 9, R.D. Joseph 9 and D.B. Sanders; ** 9

1 Institute of Astronomy, The University of Tokyo, 2-21-1 Osawa Mitaka, Tokyo, 181, Japan
2 Institute of Space and Astronautical Science (ISAS), 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229, Japan
3 ISO Science Operations Centre, Astrophysics Division of ESA, Villafranca, E-28080 Madrid, Spain
4 Astronomical Institute, Tohoku University, Aoba, Sendai 980-77, Japan
5 Department of Astrophysics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01, Japan
6 Department of Physics, Gifu University, Gifu 501-11, Japan
7 National Astronomical Observatory, 2-21-1 Osawa Mitaka, Tokyo 181, Japan
8 Department of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
9 Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA

Received 2 March 1998 / Accepted 22 May 1998


Two [FORMULA] fields in the Lockman Hole were mapped at 95 µm and 175 µm using ISOPHOT. A simple program code combined with PIA works well to correct for drift in the detector responsivity. The number density of 175 µm sources is 3-10 times higher than expected from the no-evolution model.

Key words: galaxies: evolution – galaxies: starburst – cosmology: observations – infrared: galaxies

* Based on observations with ISO, an ESA project with instruments funded by ESA member states (especially the PI countries: France, Germany, the Netherlands, and the United Kingdom) and with the participation of ISAS and NASA.
** The ISOPHOT data presented in this paper was reduced using PIA, which is a joint development by the ESA Astrophysics Division and the ISOPHOT consortium led by the Max Plank Institute for Astronomy (MPIA), Heidelberg.

Send offprint requests to: K. Kawara (kkawara@mtk.ioa.s.u-tokyo.ac.jp)

© European Southern Observatory (ESO) 1998

Online publication: July 7, 1998