The Vertical Structure of Resolved Stars in Edge-On Galaxies

Details The Vertical Structure of Resolved Stars in Edge-On Galaxies The Vertical Structure of Resolved Stars in Edge-On Galaxies

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.6010s&link_type=abstract

American Astronomical Society Meeting 205, #60.10; Bulletin of the American Astronomical Society, Vol. 36, p.1443

Astronomy and Astrophysics

Astronomy

Scientific paper

We present analysis of resolved stellar photometry in six nearby, late-type, edge-on galaxies imaged with the Advanced Camera for Surveys on the Hubble Space Telescope. In each of the galaxies, we find evidence for an extended component of stars reaching many scale heights above the midplane. This extended component is found to have a larger scale height than expected from single-disk model fits to 2MASS K-band data. In addition, based on evidence from the color-magnitude diagrams, the stellar populations at large disk heights are found to be old and metal-poor. Based on the scale height, age and metallicity of the extended components, we suggest that each galaxy has a thick disk or halo component.

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