Candidate Milky Way satellites in the Galactic halo

Details Candidate Milky Way satellites in the Galactic halo Candidate Milky Way satellites in the Galactic halo

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...477..139l&link_type=abstract

Astronomy and Astrophysics, Volume 477, Issue 1, January I 2008, pp.139-145

Astronomy and Astrophysics

Astrophysics

14

Galaxy: Structure, Galaxy: Halo, Galaxies: Dwarf, Local Group

Scientific paper

Aims:Sloan Digital Sky Survey (SDSS) DR5 photometric data with 120° < α < 270°, 25° < δ < 70° were searched for new Milky Way companions or substructures in the Galactic halo. Methods: Five candidates are identified as overdense faint stellar sources that have color-magnitude diagrams similar to those of known globular clusters, or dwarf spheroidal galaxies. The distance to each candidate is estimated by fitting suitable stellar isochrones to the color-magnitude diagrams. Geometric properties and absolute magnitudes are roughly measured and used to determine whether the candidates are likely dwarf spheroidal galaxies, stellar clusters, or tidal debris. Results: SDSSJ1000+5730 and SDSSJ1329+2841 are probably faint dwarf galaxy candidates while SDSSJ0814+5105, SDSSJ0821+5608, and SDSSJ1058+2843 are very likely extremely faint globular clusters. Conclusions: Follow-up study is needed to confirm these candidates.

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