Precision Distances to Dwarf Galaxies and Globular Clusters from Pan-STARRS1 3π RR Lyrae
| Autor: | Nina Hernitschek, Richard J. Wainscoat, Eugene A. Magnier, Christopher M. Waters, William S. Burgett, Nigel Metcalfe, Rolf-Peter Kudritzki, Judith G. Cohen, Hans-Walter Rix |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics RR Lyrae variable Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Stars Space and Planetary Science Globular cluster 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Parallax 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Dwarf galaxy |
| Zdroj: | The Astrophysical Journal Astrophysical journal, 2019, Vol.871(1), pp.49 [Peer Reviewed Journal] |
| Popis: | We present new spatial models and distance estimates for globular clusters (GC) and dwarf spheroidals (dSphs) orbiting our Galaxy based on RR Lyrae (RRab) stars in the Pan-STARRS1 (PS1) 3$\pi$ survey. Using the PS1 sample of RRab stars from Sesar et al. (2017) in 16 globular clusters and 5 dwarf galaxies, we fit structural models in $(l,b,D)$ space; for 13 globular clusters and 6 dwarf galaxies, we give only their mean heliocentric distance $D$. We verify the accuracy of the period-luminosity (PL) relations used in Sesar et al. (2017) to constrain the distance to those stars, and compare them to period-luminosity-metallicity (PLZ) relations using metallicities from Carretta et al. (2009). We compare our Sesar et al. (2017) distances to the parallax-based \textit{Gaia} DR2 distance estimates from Bailer-Jones et al. (2018), and find our distances to be consistent and considerably more precise. |
| Databáze: | OpenAIRE |
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