Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20711315c&link_type=abstract
American Astronomical Society Meeting 207, #113.15; Bulletin of the American Astronomical Society, Vol. 37, p.1347
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present the integrated correlation function of resolved young stars in four dwarf galaxies, using Hubble Space Telescope images that minimize the problems of crowding, dust, stellar age identification, and foreground contamination. For each galaxy, we calculate the correlation function across scales from 20 pc to 1000 pc, for five different stellar populations selected by color and magnitude. On a scale of 100 pc, cluster dimensions for stars younger than 50 Myr cover a large range, from 0.5 +/- 0.2 to 1.6 +/- 0.1; for comparison, the dimension of interstellar clouds is 1.2 - 1.5, typically cited as 1.35. The correlation dimensions for older stars are closer to two, as expected for less-clustered, two-dimensional distributions. We compare the galaxy correlation functions with those from a suite of projected ellipsoidal Poisson distributions, and find that the galaxies are different from these simple models. Therefore, the differences among the galaxies reflect clustering information beyond simple projection effects.
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