SUMMARY OF PROPOSAL 41190 DR. HIDEYO KUNIEDA NAGOYA UNIVERSITY AICHI JAPAN 464 NAGOYA FURO-CHO, CHIKUSA E-mail: KUNIEDA@SATIO.PHYS.NAGOYA-U.AC.JP Tel: 052-789-2918 Fax: 052-789-2919 Medium: 2.5GB8MM Subject: AGN Title: LONG TERM OBSERVATION OF NGC5548; WHERE IS THE WARM ABSORBER? Abstract: Two important discoveries in AGN with Asca are the broad iron line features and the warm absorbers. Both suggest a massive black hole and its strong radiation. In order to decide the size and structure of the black hole environment, we propose long term observations of NGC 5548, that covers totally 9 days. OVII and OVIII edge feature may change in different manner, suggesting they are attributed to different regions. If EUVE observations are arranged close to Asca, the absorption feature in X-rays, due to the gas on the line of sight, can be compared to the emission from the whole hot gas shell. Additionally total observation time of 120 ksec yields high quality spectrum to examine the broad iron line feature, which seemed to be double horns in the previous observation. Co-Is: 1 JELLE KAASTRA SRON NETH (No Co-I contact data) 2 ROLF MEWE SRON NETH 3 ANDY FABIAN CAMBRIDGE, IOA UK 4 W. BRANDT CAMBRIDGE, IOA UK 5 KAZUSHI IWASAWA NAGOYA UNIVERSITY JAPAN 6 CHIKO OTANI ISAS JAPAN Target Name PRI RA Dec Time TC Off GIS SIS_Cts Obs ------------------- --- -------- -------- ---- -- --- --- ------- --- NGC5548 1 214.4979 25.1368 100 N Y P 1.00000 5 REMARKS: WE WOULD LIKE TO ALLOCATE 120 KSEC INTO 5 OBSERVATIONS AS FOLLOWS, FIRST DAY, 20 KSEC THIRD DAY, 20 KSEC FIFTH DAY, 40 KSEC SEVNTH DAY, 20 KSEC NINETH DAY, 20 KSEC (THIS PLAN IS NEGOTIABLE.)