SUMMARY OF PROPOSAL 41100
DOCTOR NOBUO ARIMOTO
UNIVERSITY OF TOKYO
TOKYO JAPAN 181
MITAKA
2-21-1 OSAWA

  E-mail: ARIMOTO@MTK.IOA.S.U-TOKYO.AC.JP	Tel: 0422-34-3732	Fax: 0422-34-3749
  Medium: 4GBDAT

Subject: NORMAL GALAXIES                                             
  Title: X-RAY SPECTROSCOPY OF A METAL-POOR GIANT ELLIPTICAL:NGC5018 AND NGC2865         


Abstract:
 We propose to observe two metal-poor giant elliptical galaxies NGC5018 and NGC2865.
 These galaxies are well known to have unusually low Mg2 indices indicating very low
 metallicity in spite of their high luminosity. We wish to confirm first if hot X-ray
 gas in these galaxies show really low iron abundances which suggest they were formed
 by rare mergers bewteen two gas-less ellipticals. Second, and if so it means that
 the observed iron abudance in the gas is essentially the same as the mean stellar
 iron abundance and suggests no SNIa contribution to the nucleosynthesis in
 elliptical galaxies, in contrast to the case in the solar neighbourhood of the Milky Way.

 Co-Is:
   1  KYOKO MATSUSHITA    	UNIVERSITY OF TOKYO           JAPAN     
      MATUSITA@MIRANDA.PHYS.S.U-TOKYO.AC.JP	03-3812-2111 EX4173
   2  KAZUO MAKISHIMA     	UNIVERSITY OF TOKYO           JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
NGC5018                1  198.2542  -19.5181    50   N   Y   P  0.05000   1 
          
NGC2865                1  140.8792  -23.1633    50   N   Y   P  0.05000   1