ISO deep far-infrared survey in the ``Lockman Hole''. A search for obscured objects at high redshift. I. Observations
Sanders, D. B.; Kawara, K.; Taniguchi, Y.; Chambers, K. C.; Cowie, L. L.; Matsuhara, H.; Okamura, S.; Sato, Y.; Okuda, H.; Matsumoto, T.; Wakamatsu, K.; Sofue, Y.; Joseph, R. D.; Karoji, H.
Japan, Spain, United States
Abstract
Two 44arcmin x 44arcmin fields in the Lockman Hole were mapped at 95 mu m and 175 mu m using ISOPHOT. A simple program code combined with PIA works well to correct for drift in the detector responsivity. The number density of 175 mu m sources is 3-10 times higher than expected from the no-evolution model. 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.