학술논문
SDSS-IV MaStar: A Large and Comprehensive Empirical Stellar Spectral Library-First Release
Document Type
article
Author
Yan, R; Chen, Y; Lazarz, D; Bizyaev, D; Maraston, C; Stringfellow, GS; Mccarthy, K; Meneses-Goytia, S; Law, DR; Thomas, D; Barroso, JF; Sánchez-Gallego, JR; Schlafly, E; Zheng, Z; Argudo-Fernández, M; Beaton, RL; Beers, TC; Bershady, M; Blanton, MR; Brownstein, J; Bundy, K; Chambers, KC; Cherinka, B; Lee, ND; Drory, N; Galbany, L; Holtzman, J; Imig, J; Kaiser, N; Kinemuchi, K; Liu, C; Luo, AL; Magnier, E; Majewski, S; Nair, P; Oravetz, A; Oravetz, D; Pan, K; Sobeck, J; Stassun, K; Talbot, M; Tremonti, C; Waters, C; Weijmans, AM; Wilhelm, R; Zasowski, G; Zhao, G; Zhao, YH
Source
Astrophysical Journal. 883(2)
Subject
Language
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.