SUMMARY OF PROPOSAL 52190
UNIVERSITY OF VIRGINIA
P.O. BOX 3818
CHARLOTTESVILLE
VIRGINIA USA 22903-0818
Tel: 804-924-4903 Fax: 804-924-3104
Medium: 5GB8MM
Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS
CLUSTER DARK MATTER DENSITY PROFILES AT VERY LARGE RADII
ABSTRACT
We propose offset reobservations of A3571 and A2256 to measure their gas temperatures out to r=1.6 and 2 Mpc, respectively. ASCA temperature maps suggest that these clusters have been undisturbed in the past. This makes them good candidates for a reliable determination of mass profiles at large radii, which addresses a number of interesting cosmological issues. There are very few clusters for which such measurements are feasible with ASCA. A3571 has a moderate cooling flow which makes it a rather typical cluster. At the proposed radius in A3571, we expect to see a temperature decline like the one we detected in several other clusters -- if this phenomenon is indeed common. The proposed and existing A2256 data will provide a cluster temperature profile of unprecedented quality.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| MAXIM MARKEVITCH | U. VIRGINIA | USA |
| ALEXEY VIKHLININ | CFA | USA |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)A3571 | 2 | 206.8700 | -32.8600 | 50 ks | N | N | P | 1.20000 | 2 |
TARGET 1
TWO 15' OFFSETS; COORDS ARE GIVEN FOR CLUSTER CENTER