A Search for Primeval Galaxies and Quasars

scientific abstract we are proposing a search for primeval galaxies and quasars, which consists of the following two surveys. 1. isocam deep survey for pgs (primeval galaxies): the 7 micron filter (lw2) is used to search for pgs. under the reasonable flat field error a 0.0003, it is possible to detect bright pgs such as forming ellipticals in a normal mass range. the lw2 would enable us to detect such pgs at a 5 sigma level even if they are obscured by av 9. since deep kband imagings are being taken in target fields on the uh 2.2 m telescope, pg candidates can be recognized by their extreme k7 micron color. 2. isophot deep survey for pqs (primeval qsos): the c_90 and c_160 bands are used to search for ultraluminous ir galaxies at high redshifts. according to a scenario of qso formation proposed by one of us (sanders et al. 1988), a merger between two gasrich galaxies would evolve into a qso after an ultraluminous ir galaxy phase. if this is the case and the peak of the qso volume density around z 2 is caused by qso formation taken beyond z 2, we could detect many ultraluminous ir galaxies as pqs, thus this isophot survey providing a critical test on qso formation at high redshifts. observation summary 1. isocam deep survey for pgs this project will be made for four 3. x 3. fields, namely, 1) lhnw, 2) lhsw (hi miniumum points in the lockman hole), 3) ssa13, and 4) ssa22. deep optical and kband images have already been taken in fields 3) and 4) by cowie et al., and the similar observations are in progress for fields 1) and 2) by taniguchi et al. we predict a few pgs to be detected with the following observational parameters. to obtain ultradeep isocam images at a 5 sigma flux level of 10 microjy, we require an onsource integration time as long as 6 hours by assuming flatfielding accuracy of 1e4. in this sense, this observation is the most ambitious and thus risky among iso projects. we would truncated!, Plea [truncated!, Please see actual data for full text]