Mapping low-latitude stellar substructure with SEGUE photometry

Details Mapping low-latitude stellar substructure with SEGUE photometry Mapping low-latitude stellar substructure with SEGUE photometry

2008-08-12

arxiv.org/abs/0808.1738v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of IAU Symposium 254 "The Galaxy disk in a cosmological context", Copenhagen, June 2008

Scientific paper

Encircling the Milky Way at low latitudes, the Low Latitude Stream is a large stellar structure, the origin of which is as yet unknown. As part of the SEGUE survey, several photometric scans have been obtained that cross the Galactic plane, spread over a longitude range of 50 to 203 degrees. These data allow a systematic study of the structure of the Galaxy at low latitudes, where the Low Latitude Stream resides. We apply colour-magnitude diagram fitting techniques to map the stellar (sub)structure in these regions, enabling the detection of overdensities with respect to smooth models. These detections can be used to distinguish between different models of the Low Latitude Stream, and help to shed light on the nature of the system.

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