Overview of The SDSS-V Magellanic Genesis Survey

TL;DR

The SDSS-V Magellanic Genesis survey maps the kinematic and chemical structure of the Magellanic Clouds using APOGEE and BOSS spectroscopy, providing detailed chemo-dynamical data across the Clouds' main bodies and extended regions.

Contribution

This survey offers new high-resolution infrared and optical spectroscopic data of Magellanic Cloud stars, enabling comprehensive chemo-dynamical studies and cross-instrument calibration.

Findings

High-resolution APOGEE spectra of ~14,000 AGB-O stars in the LMC and SMC.

BOSS optical spectra of fainter red giant stars extending to the Clouds' outskirts.

Enhanced understanding of massive stellar evolution through observations of evolved massive stars.

Abstract

The Sloan Digital Sky Survey-V (SDSS-V) Magellanic Genesis survey is a spectroscopic program designed to map the kinematic and chemical structure of the Magellanic Clouds using APOGEE and BOSS spectroscopy. This overview describes the survey's design, target selection, and science goals, and highlights some first results using these data. In the inner regions of the Large and Small Magellanic Clouds (LMC and SMC), the survey obtained high-resolution near-infrared APOGEE spectra (S/N~45) of ~14,000 bright, oxygen-rich asymptotic giant branch (AGB-O) stars. These data provide contiguous spatial coverage of the Clouds' main bodies, enabling detailed chemo-dynamical studies. To explore extended structures, the survey includes BOSS optical spectroscopy of fainter red giant (RG) stars selected with \gaia~DR3 data, reaching G~17.5. Many of these targets extend to the outer regions of the Clouds, which are known to span ~20 deg (LMC) and ~12 deg(SMC) and contain diffuse substructures of unclear origin. BOSS data in the inner regions also complement APOGEE by providing elements inaccessible in the near-infrared and enabling cross-calibration between instruments. The survey further includes APOGEE and BOSS observations of ~300 evolved massive stars and a small sample of symbiotic binaries previously observed by APOGEE-1 and -2, enhancing our understanding of massive stellar evolution and complementing the SDSS-V main-sequence massive star program.