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The DESI Y1 RR Lyrae catalog I: Empirical modeling of the cyclic variation of spectroscopic properties and a chemodynamical analysis of the outer halo by Medina, Gustavo E.; Li, Ting S.; Koposov, Sergey E.; Riley, A. H.; Silva, L. Beraldo e; Valluri, M.; Wang, W.; Byström, A.; Gnedin, O. Y.; Carlberg, R. G.; Kizhuprakkat, N.; Weaver, B. A.; Aguilar, J.; Ahlen, S.; Bianchi, D.; Brooks, D.; Claybaugh, T.; Cooper, A. P.; de la Macorra, A.; Dey, A.; Doel, P.; Font-Ribera, A.; Forero-Romero, J. E.; Gaztañaga, E.; Gontcho, S. Gontcho A; Gutierrez, G.; Guy, J.; Honscheid, K.; Ishak, M.; Kisner, T.; Landriau, M.; Guillou, L. Le; Meisner, A.; Miquel, R.; Myers, A. D.; Nadathur, S.; Poppett, C.; Prada, F.; Pérez-Ràfols, I.; Rossi, G.; Sanchez, E.; Seo, H.; Sprayberry, D.; Tarlé, G.; Wechsler, R. H.; Zhou, R.; Zou, H. is a scholarly article available to read on EtoBox.

What is The DESI Y1 RR Lyrae catalog I: Empirical modeling of the cyclic variation of spectroscopic properties and a chemodynamical analysis of the outer halo about?

We present the catalog of RR Lyrae stars observed in the first year of operations of the Dark Energy Spectroscopic Instrument (DESI) survey. This catalog contains 6,240 RR Lyrae stars out to $\sim100$\,kpc from the Galactic center and over 12,000 individual epochs with homogeneously-derived stellar atmospheric parameters. We introduce a novel methodology to model the cyclical variation of the spectroscopic properties of RR Lyrae from single-epoch measurements. We employ this method to infer the radial velocity and effective temperature variation of fundamental mode and first-overtone RR Lyrae stars and to determine their systemic velocities and mean temperatures. For fundamental mode pulsators, we obtain radial velocity curves with amplitudes of $\sim$30--50\,km\,s$^{-1}$ and effective temperature curves with 300--1,000\,K variations, whereas for first-overtone pulsators these amplitudes are $\sim20$\,km\,s$^{-1}$ and $\sim 600$\,K, respectively. We use our sample to study the metallicity distribution of the halo and its dependence on Galactocentric distance ($R_{\rm GC}$). Using a radius-dependent mixture model, we split the data into chemodynamically distinct components and find

Author

Medina, Gustavo E.; Li, Ting S.; Koposov, Sergey E.; Riley, A. H.; Silva, L. Beraldo e; Valluri, M.; Wang, W.; Byström, A.; Gnedin, O. Y.; Carlberg, R. G.; Kizhuprakkat, N.; Weaver, B. A.; Aguilar, J.; Ahlen, S.; Bianchi, D.; Brooks, D.; Claybaugh, T.; Cooper, A. P.; de la Macorra, A.; Dey, A.; Doel, P.; Font-Ribera, A.; Forero-Romero, J. E.; Gaztañaga, E.; Gontcho, S. Gontcho A; Gutierrez, G.; Guy, J.; Honscheid, K.; Ishak, M.; Kisner, T.; Landriau, M.; Guillou, L. Le; Meisner, A.; Miquel, R.; Myers, A. D.; Nadathur, S.; Poppett, C.; Prada, F.; Pérez-Ràfols, I.; Rossi, G.; Sanchez, E.; Seo, H.; Sprayberry, D.; Tarlé, G.; Wechsler, R. H.; Zhou, R.; Zou, H.

Published

2025

Language

EN