Halos of Nearby Edge-on Spirals

Physics

Scientific paper

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Hst Proposal Id #6730 Stellar Populations

Scientific paper

HST allows the detection of the tip of the halo field star giant branch in galaxies at distances of order 10 Mpc. Used in conjunction with recently developed techniques of deep CCD surface photometry, this will allow us to extend the {currently very small} sample of well-studied spiral galaxy halos and to begin to determine whether the Milky Way halo is typical. We are proposing to take deep WFPC2 exposures in F814W of a halo field in the nearby edge-on spiral NGC 5907. We have deep CCD surface photometry {to R and I 27 mag/sq arcsec} of the galaxy, and propose to use deep WFPC2 images to check that the extended halos seen in the surface photometry originate from halo starlight and not from various phases of the ISM. In addition, these images will allow the identification of halo globular clusters and the measurement of an accurate distance via a globular cluster luminosity function and red giant tip luminosity.

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