S20A0079abst
S20A0079
As a continuation of the observation in S19A, we propose to carry out a spectroscopic follow-up observation of two candidate Milky Way dwarf satellites, Virgo I and Boötes IV, newly discovered by the HSC survey. Understanding the dynamical and chemical properties of the Milky Way satellites provides a powerful test for the theory of galaxy formation in the smallest scale predicted by the currently standard Λ CDM cosmology. The previous FOCAS observation of Virgo I and Boötes IV (S19A) was successful in identifying calcium triplet lines in spectra of a few brightest candidate member stars. In this semester, we propose to carry out the second epoch observation for these two galaxies to identify star belonging to a binary system, which is crucial for the dynamical mass estimate. Also, the previous observation was severely affected by high sky background because of the moon on the alocated nights and thus the proposed observation is essential to obtain line-of-sight velocities for the fainter stars and chemical composition in the brighter stars.
This document was translated from LATEX by HEVEA.