Title: The Cosmic Microwave Background and the Stellar Initial Mass Function Show Chinese title

Title: 宇宙微波背景和恒星初始质量函数

Abstract: We argue that an increased temperature in star-forming clouds alters the stellar initial mass function to be more bottom-light than in the Milky Way. At redshifts $z \gtrsim 6$, heating from the cosmic microwave background radiation produces this effect in all galaxies, and it is also present at lower redshifts in galaxies with very high star formation rates (SFRs). A failure to account for it means that at present, photometric template fitting likely overestimates stellar masses and star formation rates for the highest-redshift and highest-SFR galaxies. In addition this may resolve several outstanding problems in the chemical evolution of galactic halos. Show Chinese abstract

Abstract: 我们认为，恒星形成云中的温度升高会使恒星初始质量函数变得比银河系中的更底部轻。 在红移$z \gtrsim 6$时，来自宇宙微波背景辐射的加热会在所有星系中产生这种效应，并且在低红移时，在恒星形成率（SFRs）非常高的星系中也存在。 未能考虑这一点意味着目前光度模板拟合可能会高估最高红移和最高SFR星系的恒星质量以及恒星形成率。 此外，这可能解决星系晕化学演化中的几个未解问题。