Bibcode
Fabrizio, M.; Nonino, M.; Stetson, P. B.; Bono, G.; Buonanno, R.; Iannicola, G.; Monelli, M.; Walker, A.
Referencia bibliográfica
EAS Publications Series, Volume 48, 2011, pp.81-83
Advertised on:
7
2011
Número de citas
0
Número de citas referidas
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Descripción
We present the radial velocity (RV) distribution of Carina dSph,
obtained using low-, medium- and high-resolution spectroscopic data
collected with FORS2 and GIRAFFE at the VLT. We found that regions where
the mean RV is smaller the dispersion is also smaller, and the RV
distribution is sharper (i.e. the kurtosis attains larger values). The
mean RV, when moving to lower Galactic latitude, decreases by ˜
5kms-1, attains a well defined minimum outside the galaxy
center, and a constant value at larger distances. The RV gradient
appears to be in the direction of the Carina proper motion. However,
this parameter is affected by large uncertainties to reach a firm
conclusion. These findings are probably reminiscent of a substructure
with transition properties, already detected in dwarf ellipticals, and
call for independent confirmations.