NOAO >   Observing Info >   Approved Programs >   2008A-0258

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Proposal Information for 2008A-0258


PI: Tsuyoshi Sakamoto, Japan Spaceguard Association, sakamoto@spaceguard.or.jp
Address: Bisei Spaceguard Center, 1716-3, Ookura, Bisei, Ibara, Okayama 714-1411, Japan

CoI: Takashi Hasegawa, Gunma Astronomical Observatory

Title: Search for Galactic dwarf galaxies toward the NGC 3109 subgroup in the Local Group

Abstract: Dwarf galaxies are building blocks of larger galaxies within the framework of hierarchical galaxy formation in a cold dark-matter universe, and they might keep a lot of information on the mass assembly of the host galaxy. Galaxies in the Local Group (LG) are mainly found around three galaxies, i.e., Milky Way, M31, and NGC 3109, and the comparison in the number density of Galactic dwarf galaxies among in the direction of M31 subgroup, that of NGC 3109 subgroups, and the other directions puts important limits on whether or not Galactic dwarf galaxies accreted from the direction of the existing LG subgroup. However, the completeness in the detection of Galactic dwarf galaxies in the direction of NGC 3109 subgroup is expected to be low due to lack of deep photometric data. We search for Galactic dwarf galaxies in the direction of NGC 3109 subgroup by obtaining photometric data down to 21 mag in g'- and r'-bands, and set limits on whether Galactic dwarf galaxies accreted along the existing Local-Group subgroup.


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NOAO >   Observing Info >   Approved Programs >   2008A-0258

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