Infrared radiation feedback does not regulate star cluster formation

ABSTRACT We present 3D radiation-hydrodynamical (RHD) simulations of star cluster formation and evolution in massive, self-gravitating clouds, whose dust columns are optically thick to infrared (IR) photons. use VETTAM – a recently developed, novel RHD algorithm, which uses the Variable Eddington Tensor closure model IR radiation transport through cloud. also realistic temperature (T) dependent opacities (?) our simulations, improving upon earlier works this area, used either constant or simplified power laws (? ? T2). investigate impact pressure these photons on efficiency cloud, its potential drive dusty winds. find that is unable regulate prevent accretion clusters, even for very high gas surface densities ($\Sigma \gt 10^5 \, \mathrm{M}_{\odot } \mathrm{pc}^{-2}$), contrary recent semi-analytic predictions simulation results using treatments opacity. commonly adopted simplifications ? T2 leads discrepancy, as those approximations overestimate force. By contrast, with take into account microphysics dust, we mild, at significantly dust-to-gas ratios (?3 times solar), suggesting it unlikely be an important feedback mechanism controlling ISM.