SUMMARY OF PROPOSAL 42176 DR. RICHARD F MUSHOTZKY GSFC MD USA 20771 GREENBELT E-mail: MUSHOTZKY@LHEAVX.GSFC.NASA.GOV Tel: 301-286-7579 Fax: 301-286-1684 Medium: 4GBDAT Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS Title: ASCA OBSERVATIONS OF ROSAT ALL SKY SURVEY SELECTED GROUPS Abstract: Rosat has discovered x-ray emission from many groups in a serendipitous mode from pointed data (Mulchaey et al 1995). However, the "best" Rosat groups (e.g. highest flux objects) are expected from the all sky survey (RASS) In this proposal we pick the highest flux x-ray selected groups from a cross- correlation of the RASS and a optically selected catalog of groups selected from the Zwicky catalog. At present there are very few ASCA spectra of groups. ASCA observations of these high flux objects should provide the best x-ray spectra and allow determination of temperature and abundance profiles as well as measurement of the abundance of Fe, O, and Si to allow determination of the origin of the x-ray emitting gas, constrain the form of the potential and the total mass of these systems. Co-Is: 1 RICHARD WHITE GSFC USA (No Co-I contact data) 2 JACK BURNS NEW MEXICO STATE U USA 3 MICHAEL LEDLOW NEW MEXICO STATE U USA Target Name PRI RA Dec Time TC Off GIS SIS_Cts Obs ------------------- --- -------- -------- ---- -- --- --- ------- --- N56-395 0 220.1792 3.4533 20 N N P 0.23000 1 REMARKS: CHOOSE CORRECT PAIR OF CCD CHIPS,DEPENDING ON DATE OF OBSERVATION S34-111 0 16.8667 32.4000 25 N N P 0.14000 1 REMARKS: CHOOSE CORRECT PAIR OF CCD CHIPS,DEPENDING ON DATE OF OBSERVATION S49-132 0 347.5917 7.5881 20 N N P 0.11000 1 REMARKS: CHOOSE CORRECT PAIR OF CCD CHIPS,DEPENDING ON DATE OF OBSERVATION REMARKS: CHOOSE CORRECT PAIR OF CCD CHIPS,DEPENDING ON DATE OF OBSERVATION REMARKS: CHOOSE CORRECT PAIR OF CCD CHIPS,DEPENDING ON DATE OF OBSERVATION