SDSS-IV MaStar : a large and comprehensive empirical stellar spectral library—first release
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.
Citation
Yan , R , Chen , Y , Lazarz , D , Bizyaev , D , Maraston , C , Stringfellow , G S , McCarthy , K , Meneses-Goytia , S , Law , D R , Thomas , D , Falcon Barroso , J , Sánchez-Gallego , J R , Schlafly , E , Zheng , Z , Argudo-Fernández , M , Beaton , R L , Beers , T C , Bershady , M , Blanton , M R , Brownstein , J , Bundy , K , Chambers , K C , Cherinka , B , De Lee , N , Drory , N , Galbany , L , Holtzman , J , Imig , J , Kaiser , N , Kinemuchi , K , Liu , C , Luo , A-L , Magnier , E , Majewski , S , Nair , P , Oravetz , A , Oravetz , D , Pan , K , Sobeck , J , Stassun , K , Talbot , M , Tremonti , C , Waters , C , Weijmans , A-M , Wilhelm , R , Zasowski , G , Zhao , G & Zhao , Y-H 2019 , ' SDSS-IV MaStar : a large and comprehensive empirical stellar spectral library—first release ' , Astrophysical Journal , vol. 883 , no. 2 , 175 , pp. 1-26 . https://doi.org/10.3847/1538-4357/ab3ebc
Publication
Astrophysical Journal
Status
Peer reviewed
ISSN
0004-637XType
Journal article
Rights
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