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   PR # 41190
   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.
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