Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8337c&link_type=abstract
HST Proposal ID #8337
Other
Hst Proposal Id #8337 Galaxy Populations And Interactions
Scientific paper
Intracluster starlight can be a powerful probe of the structure and evolutionary state of galaxy clusters. Recently, this field of study has been revolutionized by the ground-based discovery of intracluster planetary nebulae {IPN} in the Virgo and Fornax Clusters, and by the detection of Virgo's intracluster red giants {IRG} by HST. These two measurements should complement each other: ground-based IPN surveys can map out the distribution and kinematics of the intracluster stars, while HST IRG measurements at specific locations in the cluster can provide details about the stellar population and normalize the IPN data. Unfortunately, the IPN and the IRG observations to date are not complementary. The distribution of intracluster stars in Virgo is clumpy, and the HST IRG field has the misfortune to be located in a region of very low stellar density. Since very few IPN are located in the field, we cannot compare their luminosity function to that of the red giants. We pro po se to use the Hubble Space Telescope to detect IRG stars in regions of the Virgo cluster where the stellar density is high and the IPN luminosity function is well defined. These observations will allow us to calibrate IPN measurements in the rest of the cluster, independently confirm the Virgo Cluster morphology, and place new constraints on the parent populations of the intracluster stars.
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