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28 March 2024
 
  » arxiv » 1507.1593

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Probing Galactic Structure with the Spatial Correlation Function of SEGUE G-dwarf Stars
Qingqing Mao ; Andreas A. Berlind ; Kelly Holley-Bockelmann ; Katharine J. Schlesinger ; Jennifer A. Johnson ; Constance M. Rockosi ; Timothy C. Beers ; Donald P. Schneider ; Kaike Pan ; Dmitry Bizyaev ; Elena Malanushenko ;
Date 6 Jul 2015
AbstractWe 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.
Source arXiv, 1507.1593
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