The extended structure of the Phoenix dwarf galaxy

Details The extended structure of the Phoenix dwarf galaxy The extended structure of the Phoenix dwarf galaxy

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ap%26ss.284..595h&link_type=abstract

Astrophysics and Space Science, v. 284, Issue 2, p. 595-598 (2003).

Astronomy and Astrophysics

Astrophysics

2

Galaxies: Dwarf, Galaxies: Stellar Content, Galaxies: Structure

Scientific paper

The surface brightness profile in the V band of the Phoenix dwarf galaxy shows two stellar components: an inner one, which contains all the young stars of the galaxy, and an outer one predominantly populated by red stars. Deep color-magnitude diagrams (CMDs), based on Hubble Space Telescope (HST) observations and reaching the oldest turn-offs, are used to analyze the inner and outer stellar components. Results show that, together with an old stellar population, the outer field contains also an intermediate-age population. These results are compatible with a scenario in which star forming regions are shrinking with time (the shrinking scenario). It seems more difficult to support a halo-disk scenario, which would require extended structures populated only by really old stars.

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