SUMMARY OF PROPOSAL 41165
DR. MATTEO GUAINAZZI
THE INSTITUTE OF PHYSICAL AND CHEMICAL RESEARCH
SAITAMA JAPAN 351-01
WAKO-SHI
2-1, HIROSAWA

  E-mail: MATTEO@CRAB.RIKEN.GO.JP	Tel: 048-462-1111	Fax: 048-462-4640
  Medium: 4GBDAT

Subject: AGN                                                         
  Title: SOFT EXCESS VARIABILITY IN THE SEYFERT 1 GALAXY ESO198-G24                      


Abstract:
 The ``soft excess'' is a very common feature in the X-ray spectra of Seyfert 1
 galaxies. Nevertheless no unifying interpretative scheme has been assessed up to
 now. We propose to observe ESO198-G24 because it has a strong and variable soft
 excess. ESO198-G24 is a typical Seyfert 1 which s hows dramatic flux changes at
 different wavelenghts. ROSAT revealed a factor of 3 variation of flux in two
 6-months separated observations, and correlated variability of the soft-excess.
 However, the quality of the ROSAT data do not allow to distinguish between a
 variation of a "warm absorber" or a variation of a soft continuum emission (e.g. a
 black-body emission). These results concur in making ESO198-G24 a very attracting
 target to investigate the soft X-ray properties of Seyfert 1 with ASCA.

 Co-Is:
   1  TATEHIRO MIHARA     	RIKEN                         JAPAN     
      MATSUOKA@POSTMAN.RIKEN.GO.JP	048-462-1111
   2  MASSIMO CAPPI       	RIKEN                         JAPAN     
   3  MASARU MATSUOKA     	RIKEN                         JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
ESO198-G24             3   39.5792  -52.1897    40   N   N   P  1.00000   1