SUMMARY OF SEQUENCE NUMBER 600108
SUMMARY OF SEQUENCE NUMBER 600108
Title: DIFFUSE HOT GAS IN THE EXTREMELY METAL-POOR GALAXY I ZW 18
Observer: Bomans
Subject Category: Normal Galaxies
Seq: 600108 ObsId: 00805
Long-term Plan bin: no LTS bin
ABSTRACT
I Zw 18 is the most metal-poor galaxy known so far. It was interpreted as a young galaxy, which is incompatible with its recently observed high carbon abundance. Kpc-sized expanding shells and the newly detected extended X-ray emission indicate that I Zw 18 is experiencing a large scale outflow of gas into its halo. If it can be shown, that the metals created by the starburst are locked in the hot gas, the evolutionary state of I Zw 18 could be understood. We propose an AXAF study of I Zw 18 using ACIS-S to accurately determine the properties of the diffuse hot gas in I Zw 18 and its halo. Combined with HST data on the warm ionized gas and stellar content, this will sensitively probe the evolutionary state of I Zw 18 and test the galactic wind paradigm of dwarf galaxy evolution.
TARGET SUMMARY
| TARGET NAME |
RA | DEC |
TIME |
SI |
GRAT |
TYPE |
TC |
ROLL |
PRE |
PHASE |
MULTI |
PRI |
| I ZW 18 |
143.508333 | 55.241111 |
40.00000 |
ACIS-S |
NONE |
GO |
yes |
no |
no |
no |
no |
5 |
IMAGES
(NOTE: RASS images currently only available for targets LTS scheduled on or after Apr-09-2000)
PARAMETERS
Obscat Parameters
