SUMMARY OF PROPOSAL 72077
NASA / GSFC
CODE 662, GSFC
GREENBELT
MD USA 20771
Tel: (301) 286-3844 Fax: (301) 286-1684
Medium: CD ROM
Subject: SUPERNOVA REMNANTS AND GALACTIC DIFFUSE EMISSION
SPECTRAL MAPPING OF THE UNIQUE SNR G156.2+5.7
ABSTRACT
G156.2+5.7 is an unusual SNR. The first SNR discovered by ROSAT, it appears as a nearly complete X-ray shell with diameter 108'. It has by far the lowest radio surface brightness of any Galactic SNR. It is thought to be an old SNR, expanding into very low density ISM. Ginga observations, however, revealed a hard spectral component (kT=8 keV). ASCA data of a small portion of the SNR indicate strong kT, NH and abundance variations, but do not show the hard component. We propose 4 pointings at positions complementary to the existing ones, with the goal of mapping spectral variations and locating and characterizing the hard component. This component, if thermal, could represent emission from the forward shock; if nonthermal, it could be the signature of cosmic ray acceleration.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| UNA HWANG | GSFC/UMD | USA |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)G156.2+5.7 - SE | B | 75.4167 | 51.4925 | 40 ks | N | Y | P | 0.20000 | 1 |
| 2)G156.2+5.7 - W | B | 74.2292 | 52.1475 | 40 ks | N | Y | P | 0.20000 | 1 |
| 3)G156.2+5.7 - E | C | 75.3917 | 52.1725 | 40 ks | N | Y | P | 0.20000 | 1 |
| 4)G156.2+5.7 - SW | C | 74.2208 | 51.4625 | 40 ks | N | Y | P | 0.20000 | 1 |