NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T20:33:59 PDT
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For refcode 2015AJ....149..139D:
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Copyright by American Astronomical Society. Reproduced by permission
2015AJ....149..139D A Search for Intergalactic Globular Clusters in the Local Group di Tullio Zinn, Graziella; Zinn, Robert Abstract. The whole Sloan Digital Sky Survey (SDSS, 14,555 {{deg}^2^}) has been searched for intergalactic globular clusters (IGCs) in the Local Group (LG). Using optical, infrared, and ultraviolet photometric selection criteria and photometric redshifts, the 2.1x {{10}^8^} objects in the SDSS Galaxy Catalog were reduced to only 183,791 brighter than {{r}_0_}=19 that might be GCs. Visual examination of their SDSS images recovered 84% of the confirmed GCs in M31 and M33 and yielded 17 new GC candidates, 5 of them of high confidence, which we could confirm as GCs in MegaPrime images from the Canada-France-Hawaii Telescope. These 5 GCs are within M31's halo, but the other 12 candidates are not close to LG galaxies or galaxies within 3 Mpc of the LG. Even though this search covers only one-third of the sky and some GCs could have been missed, it suggests that the LG does not contain a large population of IGCs more luminous than {{M}_V_}~ -6. In the direction of the M81 Group, the search yielded five candidate GCs, probable members of that group. Key words: galaxies: groups: general, galaxies: individual: M31, globular clusters: general, Local Group
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