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Probing Galactic Structure with the Spatial Correlation Function of SEGUE G-dwarf Stars by Mao, Qingqing; Berlind, Andreas A.; Holley-Bockelmann, Kelly; Schlesinger, Katharine J.; Johnson, Jennifer A.; Rockosi, Constance M.; Beers, Timothy C.; Schneider, Donald P.; Pan, Kaike; Bizyaev, Dmitry; Malanushenko, Elena is a scholarly article available to read on EtoBox.

What is Probing Galactic Structure with the Spatial Correlation Function of SEGUE G-dwarf Stars about?

We measure the two-point correlation function of G-dwarf stars within 1-3 kpc of the Sun in multiple lines-of-sight using the Schlesinger et al. G-dwarf sample from the SDSS SEGUE survey. The shapes of the correlation functions along individual SEGUE lines-of-sight depend sensitively on both the stellar-density gradients and the survey geometry. We fit smooth disk galaxy models to our SEGUE clustering measurements, and obtain strong constraints on the thin- and thick-disk components of the Milky Way. Specifically, we constrain the values of the thin- and thick-disk scale heights with 3% and 2% precision, respectively, and the values of the thin- and thick-disk scale lengths with 20% and 8% precision, respectively. Moreover, we find that a two-disk model is unable to fully explain our clustering measurements, which exhibit an excess of clustering at small scales (< 50 pc). This suggests the presence of small-scale substructure in the disk system of the Milky Way.

Author

Mao, Qingqing; Berlind, Andreas A.; Holley-Bockelmann, Kelly; Schlesinger, Katharine J.; Johnson, Jennifer A.; Rockosi, Constance M.; Beers, Timothy C.; Schneider, Donald P.; Pan, Kaike; Bizyaev, Dmitry; Malanushenko, Elena

Published

2015

Language

EN