Discovery of RR Lyrae in the Ultra-Faint Dwarf Galaxy Virgo III
arxiv(2024)
摘要
Virgo III is a newly discovered ultra-faint dwarf (UFD) candidate, and
finding RR Lyrae associated with this galaxy is important to constrain its
distance. In this work, we present a search of RR Lyrae in the vicinity of
Virgo III based on the time-series r-band images taken from the Lulin
One-meter Telescope (LOT). We have identified three RR Lyrae from our LOT data,
including two fundamental mode (ab-type) and a first-overtone (c-type) RR
Lyrae. Assuming these three RR Lyrae are members of Virgo III, we derived the
distance to this UFD as 154±25 kpc, fully consistent with the independent
measurements given in the literature. We have also revisited the relation
between absolute V-band magnitude (M_V) and the number of RR Lyrae (of all
types, N_RRL) found in local galaxies, demonstrating that the
M_V-N_RRL relation is better described with the specific RR Lyrae
frequency.
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