****************************************************** PR # 21141 We propose to use ASCA to search for hidden AGN in the centers of 3 of the most powerful ultraluminous IRAS galaxies:IRAS 15307+3252,IRAS 20460+1925, and IRAS 23060+0505. All three objects have luminosities characteristic of quasars and show evidence for obscuring material.We expect that,as in our earlier discovery with IRAS 09104+4109,they wil l have strong fluorescent iron line emission. The discovery of iron lines would indicate the reprocessing of X-rays from a central AGN & would be a major step forward in the unification of Seyferts,quasars, and ultraluminous IRAS galaxies. Received: from xray by kisaragi (5. 65+1.6W/TISN-1.3M/R2) id AA14237; Mon, 31 Jan 94 22:03:50 GMT Receive d: by xray (5.57/TISN-1.3M/R2) id AA20301; Mon, 31 Jan 94 22:03:41 +0 900 Received: by cast0.as ******************************************************