The Cosmic Microwave Background and the Stellar Initial Mass Function. Jermyn, A. S., Steinhardt, C. L., & Tout, C. A. Monthly Notices of the Royal Astronomical Society, 480(3):4265–4272, November, 2018. arXiv: 1809.03502
The Cosmic Microwave Background and the Stellar Initial Mass Function [link]Paper  doi  abstract   bibtex   
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 {\textbackslash}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.
@article{jermyn_cosmic_2018,
	title = {The {Cosmic} {Microwave} {Background} and the {Stellar} {Initial} {Mass} {Function}},
	volume = {480},
	issn = {0035-8711, 1365-2966},
	url = {http://arxiv.org/abs/1809.03502},
	doi = {10.1093/mnras/sty2123},
	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 {\textbackslash}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.},
	number = {3},
	urldate = {2018-09-12},
	journal = {Monthly Notices of the Royal Astronomical Society},
	author = {Jermyn, Adam S. and Steinhardt, Charles L. and Tout, Christopher A.},
	month = nov,
	year = {2018},
	note = {arXiv: 1809.03502},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	pages = {4265--4272},
}

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