S22A0113

We propose a wide-field HSC photometry of a stellar stream associated with the globular cluster NGC 5466 in the Milky Way outer halo. A newly developed NB395 filter (PI: M. Chiba) in combination with g and i broad-band filters will be used to estimate photometric [Fe/H] metallicity toward three lines of sight of the cluster and its tidal stream. The metallicity index, 1.5(g−i)- (NB395-g), provides a diagnostic to identify candidate stream member stars by removeing the majority of contaminating field Milky Way stars. With the wide-field capability on the 8m-class telescope, Subaru/HSC enable us to cover the region out to a few times the tidal radius, while going much deeper to detect lower main-sequence stars. We make use of the data to obtain the physical properties of the tidal streams, most importantly, the shape (length, width) and the orientation of the tidal stream, as well as the stellar mass function, to constrain the dynamical evolution and the tidal stream formation in this cluster.

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