Wise-allsky

SDSS-IV MaStar: A Large and Comprehensive Empirical Stellar Spectral Library—First Release

October 2019 • 2019ApJ...883..175Y

Authors • Yan, Renbin • Chen, Yanping • Lazarz, Daniel • Bizyaev, Dmitry • Maraston, Claudia • Stringfellow, Guy S. • McCarthy, Kyle • Meneses-Goytia, Sofia • Law, David R. • Thomas, Daniel • Falcon Barroso, Jesus • Sánchez-Gallego, José R. • Schlafly, Edward • Zheng, Zheng • Argudo-Fernández, Maria • Beaton, Rachael L. • Beers, Timothy C. • Bershady, Matthew • Blanton, Michael R. • Brownstein, Joel • Bundy, Kevin • Chambers, Kenneth C. • Cherinka, Brian • De Lee, Nathan • Drory, Niv • Galbany, Lluís • Holtzman, Jon • Imig, Julie • Kaiser, Nick • Kinemuchi, Karen • Liu, Chao • Luo, A. -Li • Magnier, Eugene • Majewski, Steven • Nair, Preethi • Oravetz, Audrey • Oravetz, Daniel • Pan, Kaike • Sobeck, Jennifer • Stassun, Keivan • Talbot, Michael • Tremonti, Christy • Waters, Christopher • Weijmans, Anne-Marie • Wilhelm, Ronald • Zasowski, Gail • Zhao, Gang • Zhao, Yong-Heng

Abstract • We present the first release of the MaNGA Stellar Library (MaStar), which is a large, well-calibrated, high-quality empirical library covering the wavelength range 3622-10354 Å at a resolving power of R ∼ 1800. The spectra were obtained using the same instrument as used by the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) project, by piggybacking on the Sloan Digital Sky Survey (SDSS-IV)/Apache Point Observatory Galaxy Evolution Experiment 2-N (APOGEE-2N) observations. Compared to previous empirical libraries, the MaStar library will have a higher number of stars and a more comprehensive stellar-parameter coverage, especially of cool dwarfs, low-metallicity stars, and stars with different [α/Fe], achieved by a sophisticated target-selection strategy that takes advantage of stellar-parameter catalogs from the literature. This empirical library will provide a new basis for stellar-population synthesis and is particularly well suited for stellar-population analysis of MaNGA galaxies. The first version of the library contains 8646 high-quality per-visit spectra for 3321 unique stars. Compared to photometry, the relative flux calibration of the library is accurate to 3.9% in g - r, 2.7% in r - i, and 2.2% in i - z. The data are released as part of SDSS Data Release 15. We expect the final release of the library to contain more than 10,000 stars.

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Jennifer Sobek

Associate Scientist