SUMMARY OF SEQUENCE NUMBER 600093
SUMMARY OF SEQUENCE NUMBER 600093
Title: STARBURSTS AND THE `POLLUTION' OF THE IGM: AXAF OBSERVATIONS OF THE SUPERWIND FROM NGC 253
Observer: HECKMAN
Subject Category: Normal Galaxies
Seq: 600093 ObsId: 00790
Long-term Plan bin: no LTS bin
ABSTRACT
A popular paradigm is that supernova-driven `superwinds' have chemically-enriched the IGM and have affected the chemical evolution of galaxies. We propose to test this idea by measuring the heavy-element content of the superwind in the prototypical starburst galaxy NGC 253. Prior X-ray data have demonstrated the spectral/spatial complexity of starbursts, but can not provide model-independent measurements of abundances. The unprecedented spatial resolution and good energy resolution of AXAF will finally allow us to determine chemical abundances in a superwind and determine if the flow will escape the galaxy. To meet these goals we propose a 120 ks observation of NGC 253 with ACIS-S, using the high efficiency of the BI chips to obtain high S/N,spatially-resolved spectra of the hot gas.
TARGET SUMMARY
| TARGET NAME |
RA | DEC |
TIME |
SI |
GRAT |
TYPE |
TC |
ROLL |
PRE |
PHASE |
MULTI |
PRI |
| NGC 253 |
11.835000 | -25.206667 |
45.00000 |
ACIS-S |
NONE |
GO |
no |
yes |
no |
no |
no |
5 |
IMAGES
(NOTE: RASS images currently only available for targets LTS scheduled on or after Apr-09-2000)
PARAMETERS
Obscat Parameters
