S4G extension for nearby early-type galaxies

The Spitzer Survey of Stellar Structure in Galaxies (S4G) is a detailed study of over 2300 nearby galaxies in the near-infrared (NIR), which has been critical to our...星系恒星结构斯皮策巡天（Spitzer Survey of Stellar Structure in Galaxies，S4G）是一项针对2300余个近邻星系开展的近红外（near-infrared，NIR）详尽研究，该巡天对于我们的……具有至关重要的意义。