分类： 天文学 >> 天文学 提交时间： 2023-02-19
Patrick Huber
Kate Scholberg
Elizabeth Worcester
Jonathan Asaadi
A. Baha Balantekin
Nathaniel Bowden
Pilar Coloma
Peter B. Denton
André de Gouvêa
Laura Fields
Megan Friend
Steven Gardiner
Carlo Giunti
Julieta Gruszko
Benjamin J. P. Jones
Georgia Karagiorgi
Lisa Kaufman
Joshua R. Klein
Lisa W. Koerner
Yusuke Koshio
摘要： This report summarizes the current status of neutrino physics and the broad and exciting future prospects identified for the Neutrino Frontier as part of the 2021 Snowmass Process.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
摘要： We use Gaia EDR3 data to identify stars associated with six classical dwarf spheroidals (Draco, Ursa Minor, Sextans, Sculptor, Fornax, Carina) at their outermost radii, beyond their nominal King stellar limiting radius. For all of the dSphs examined, we find radial velocity matches with stars residing beyond the King limiting radius and with $> 50\%$ astrometric probability (four in Draco, two in Ursa Minor, eight in Sextans, two in Sculptor, twelve in Fornax, and five in Carina), indicating that these stars are associated with their respective dwarf spheroidals (dSphs) at high probability. We compare the positions of our candidate "extra-tidal" stars with the orbital tracks of the galaxies, and identify stars, both with and without radial velocity matches, that are consistent with lying along the orbital track of the satellites. However, given the small number of candidate stars, we cannot make any conclusive statements about the significance of these spatially correlated stars. Cross matching with publicly available catalogs of RR Lyrae, we find one RR Lyrae candidate with $> 50\%$ astrometric probability outside the limiting radius in each of Sculptor and Fornax, two such candidates in Draco, nine in Ursa Minor, seven in Sextans, and zero in Carina. Follow-up spectra on all of our candidates, including possible metallicity information, will help confirm association with their respective dSphs, and could represent evidence for extended stellar halos or tidal debris around these classical dSphs.
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