SUMMARY OF PROPOSAL 41101
PROF. YUZURU YOSHII
UNIVERSITY OF TOKYO
 JAPAN 181

OSAWA 2-21-1 MITAKA CITY OR TOWN [FORMAT

  E-mail: YOSHII@OMEGA.MTK.IOA.S.U-TOKYO.AC.JP	Tel: 0422-34-3741	Fax: 0422-34-3749
  Medium: 2.5GB8MM

Subject: NORMAL GALAXIES                                             
  Title: THE LEO-I GROUP: MASS BALANCE AND THE MEMBERSHIP OF M96                         


Abstract:
 Leo-I is the closest group of galaxies containing both a bright spiral (M96) and a
 bright elliptical (NGC 3379) and is as such well-studied - except in X-rays. The 200
 kpc diameter HI ring orbiting NGC 3379/NGC 3384 put tight constraints on its
 interior mass and indicates that hot intragalactic gas could be the last unknown
 component in the mass balance. A deep pointing on NGC 3379/NGC 3384 will detect this
 and give an important independent dynamical mass estimate. A pointing on M96 will
 clarify and possibly prove whether or not M96 is interacting with the HI ring and
 hence is a member of Leo-I. This is extremely important for the recent determination
 of the Hubble constant from HST observations of cepheids in M96.

 Co-Is:
   1  KRISTIAN PEDERSEN   	NIELS BOHR INSTITUTE          DENMARK   
      KPEDERSEN@NBI.DK	45-35325307
   2  JENS HJORTH         	IOA CAMBRIDGE                 UK        
   3  NIAL TANVIR         	IOA CAMBRIDGE                 UK        


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
LEO-I CENTER           2  162.0333   12.5825    40   N   Y   P  0.03000   1 
          
M96                    2  161.8083   11.8197    40   N   Y   P  0.01000   1