The Carina dSph galaxy: where is the edge?

Details The Carina dSph galaxy: where is the edge? The Carina dSph galaxy: where is the edge?

2005-09-02

arxiv.org/abs/astro-ph/0509052v1

Astronomy and Astrophysics

Astrophysics

To be published on the proceedings of the XLIX meeting of the Italian Astronomical Society. Requires mem.cls

Scientific paper

Recent cosmological N-body simulations suggest that current empirical estimates of tidal radii in dSphs might be underestimated by at least one order of magnitude. To constrain the plausibility of this theoretical framework, we undertook a multiband (U,B,V,I) survey of the Carina dSph. Deep B,V data of several fields located at radial distances from the Carina center ranging from 0.5 to 4.5 degrees show a sizable sample of faint blue objects with the same magnitudes and colors of old, Turn-Off stars detected across the center. We found that the (U-V,B-I) color-color plane is a robust diagnostic to split stars from background galaxies. Unfortunately, current U,I-band data are too shallow to firmly constrain the real extent of Carina.

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