HST/NICMOS Observations of IZw18 - revealing a population of old AGB stars

Details HST/NICMOS Observations of IZw18 - revealing a population of old AGB stars HST/NICMOS Observations of IZw18 - revealing a population of old AGB stars

2000-04-25

arxiv.org/abs/astro-ph/0004338v1

Astronomy and Astrophysics

Astrophysics

9 pages, 3 figures. Accepted for publication in ApJ Letters

Scientific paper

I present the first results from a HST/NICMOS imaging study of the most metal-poor blue compact dwarf galaxy IZw18. The near infrared color-magnitude diagram (CMD) is dominated by two populations, one 10-20 Myr population of red super giants and one 0.5-5 Gyr population of asymptotic giant branch stars. Stars older than 1 Gyr are required to explain the observed CMD at the adopted distance of 12.6 Mpc, showing that IZw18 is not a young galaxy. The results hold also if the distance to IZw18 i s significantly larger. This rules out the possibility that IZw18 is a truly young galaxy formed recently in the local universe.

Affiliated with

Also associated with

No associations

Rating

HST/NICMOS Observations of IZw18 - revealing a population of old AGB stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with HST/NICMOS Observations of IZw18 - revealing a population of old AGB stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HST/NICMOS Observations of IZw18 - revealing a population of old AGB stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-473428