SUMMARY OF PROPOSAL 62158

DR MAXIM L. MARKEVITCH
MAXIM@HEAD-CFA.HARVARD.EDU

SMITHSONIAN ASTROPHYSICAL OBSERVATORY
60 GARDEN ST.
CAMBRIDGE
MA USA 02138
Tel: 617-495-7138 Fax: 617-495-7356
Medium: CD ROM
Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS

ACCURATE MEASUREMENT OF MASS DISTRIBUTION IN TWO MEDIOCRE CLUSTERS


ABSTRACT

We propose offset observations of A2199 and A496 - relaxed, typical in every respect, cooling flow clusters - to measure their mass profiles with unprecedented accuracy. These clusters are selected from a set of about 30 for which we have obtained temperature distributions with ASCA. Featureless temperature maps of their central regions indicate that they are good candidates for hydrostatic mass determinations. At z=0.03, the proposed angular offsets will cover interesting radii, while the complicating effects of the PSF and stray light will be minimal. These two clusters are among those few for which such measurements are feasible with ASCA. They will be vital members of a representative set of cluster mass profiles needed for addressing interesting cosmological issues.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
ALEXEY VIKHLININSAOUSA
CRAIG SARAZINU VIRGINIAUSA
WILLIAM FORMANSAOUSA

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)A2199
2
247.1579 39.5504 50 ksN
Y
P
0.25000
2
2)A496
2
 68.4071-13.2592 60 ksN
Y
P
0.20000
2

TARGET 1

TWO 15 ARCMIN OFFSETS; COORDINATES GIVEN FOR CLUSTER CENTER

TARGET 2

TWO 15 ARCMIN OFFSETS; COORDINATES GIVEN FOR CLUSTER CENTER