New galaxy UV luminosity constraints on warm dark matter from JWST

New galaxy UV luminosity constraints on warm dark matter from JWST
Bin Liu, Huanyuan Shan, Jiajun Zhang
arXiv:2404.13596v1 Announce Type: new
Abstract: We exploit the recent {it James Webb Space Telescope} (JWST) determination of galaxy UV luminosity functions over the redshift range $z=9-14.5$ to derive constraints on warm dark matter (WDM) models. The delayed structure formation in WDM universe makes high redshift observations to be a powerful probe to set limits on the particle mass $m_mathrm{x}$ of WDM candidates. By integrating these observations with blank-field surveys conducted by {it Hubble Space Telescope} (HST) at redshifts $z=4-8$, we impose constraints on both astrophysical and WDM parameters simultaneously. We find a new limit of $m_mathrm{x} geq 3.2$ keV for the mass of thermal relic WDM particles at $95%$ confidence level. This bound is tighter than the most stringent result derived using HST data before. Future JWST observations could further reduce the observation uncertainties and improve this constraint.arXiv:2404.13596v1 Announce Type: new
Abstract: We exploit the recent {it James Webb Space Telescope} (JWST) determination of galaxy UV luminosity functions over the redshift range $z=9-14.5$ to derive constraints on warm dark matter (WDM) models. The delayed structure formation in WDM universe makes high redshift observations to be a powerful probe to set limits on the particle mass $m_mathrm{x}$ of WDM candidates. By integrating these observations with blank-field surveys conducted by {it Hubble Space Telescope} (HST) at redshifts $z=4-8$, we impose constraints on both astrophysical and WDM parameters simultaneously. We find a new limit of $m_mathrm{x} geq 3.2$ keV for the mass of thermal relic WDM particles at $95%$ confidence level. This bound is tighter than the most stringent result derived using HST data before. Future JWST observations could further reduce the observation uncertainties and improve this constraint.