Understanding quenching mechanisms in high redshift quiescent galaxies is essential to solve the quenching puzzle. One way to approach this problem is by studying the chemical composition and age of their stellar populations. However, these systems are rare, and hard to observe, and in fact to this date, there are only two quiescent galaxies at z ∼ 2 for which α-enhancement and iron-abundance have been measured precisely: COSMOS-11494 (Kriek et al. 2016), and MRG-M0138 (Jafariyazani et al. 2020). The latter is the brightest quiescent galaxy detected in the near infrared thanks to the power of strong gravitational lensing. This galaxy was among a unique sample of five lensed, massive, quiescent systems at z ∼ 2 found by Newman et al. 2018a. In this talk, I will first present the stellar population analysis of MRG-M0138. Then, I will discuss our new results on investigating the stellar population of the other four galaxies introduced in Newman et al. 2018a. Lastly, I will show some of our preliminary results on recovering the star formation history of these galaxies, for the first time in such a sample.
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