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| Paper: |
Slicing the Monoceros Overdensity |
| Volume: |
458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way |
| Page: |
211 |
| Authors: |
Conn, B.; Noël, N.; Rix, H.-W.; Martin, N.; Lane, R.; Lewis, G.; Irwin, M.; Ibata, R.; Dolphin, A.; Chapman, S. |
| Abstract: |
We have surveyed the Monoceros Overdensity (MO) using SUPRIME-CAM and obtained deep Colour-Magnitude diagrams in three longitudinal stripes at l = 130°, 150° and 170°. The data in g and r bands are 100% complete to 24th magnitude and as such extends over three magnitudes beyond the MO main sequence turn-off. The data quality ensures a clean detection of the MO providing distance, density and metallicity information. We find that the MO appears as a wall of stars protruding out of the disk, across 40° of our survey, with a metallicity that is more metal rich than the surrounding stars. We test three formation scenarios for the MO finding that neither the galactic flare or the perturbed disc model can match the observations while the tidal stream scenario is viable but needs significantly more numerical modeling to refine a solution. |
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