%0 Generic %1 lupi2017natural %A Lupi, Alessandro %A Bovino, Stefano %A Capelo, Pedro R. %A Volonteri, Marta %A Silk, Joseph %D 2017 %K H2 formation simulations star %T The natural emergence of the correlation between H2 and star formation rate surface densities in galaxy simulations %U http://arxiv.org/abs/1710.01315 %X In this study, we present a suite of high-resolution numerical simulations of an isolated galaxy to test a sub-grid framework to consistently follow the formation and dissociation of H$_2$ with non-equilibrium chemistry. The latter is solved via the package KROME, coupled to the mesh-less hydrodynamic code GIZMO. We include the effect of star formation (SF), modelled with a physically motivated prescription independent of H$_2$, supernova feedback and mass losses from low-mass stars, extragalactic and local stellar radiation, and dust and H$_2$ shielding, to investigate the emergence of the observed correlation between H$_2$ and SF rate surface densities. We present two different sub-grid models and compare them with on-the-fly radiative transfer (RT) calculations, to assess the main differences and limits of the different approaches. We also discuss a sub-grid clumping factor model to enhance the H$_2$ formation, consistent with our SF prescription, which is crucial, at the achieved resolution, to reproduce the correlation with H$_2$. We find that both sub-grid models perform very well relative to the RT simulation, giving comparable results, with moderate differences, but at much lower computational cost. We also find that, while the Kennicutt-Schmidt relation for the total gas is not strongly affected by the different ingredients included in the simulations, the H$_2$-based counterpart is much more sensitive, because of the crucial role played by the dissociating radiative flux and the gas shielding.

@misc{lupi2017natural, abstract = {In this study, we present a suite of high-resolution numerical simulations of an isolated galaxy to test a sub-grid framework to consistently follow the formation and dissociation of H$_2$ with non-equilibrium chemistry. The latter is solved via the package KROME, coupled to the mesh-less hydrodynamic code GIZMO. We include the effect of star formation (SF), modelled with a physically motivated prescription independent of H$_2$, supernova feedback and mass losses from low-mass stars, extragalactic and local stellar radiation, and dust and H$_2$ shielding, to investigate the emergence of the observed correlation between H$_2$ and SF rate surface densities. We present two different sub-grid models and compare them with on-the-fly radiative transfer (RT) calculations, to assess the main differences and limits of the different approaches. We also discuss a sub-grid clumping factor model to enhance the H$_2$ formation, consistent with our SF prescription, which is crucial, at the achieved resolution, to reproduce the correlation with H$_2$. We find that both sub-grid models perform very well relative to the RT simulation, giving comparable results, with moderate differences, but at much lower computational cost. We also find that, while the Kennicutt-Schmidt relation for the total gas is not strongly affected by the different ingredients included in the simulations, the H$_2$-based counterpart is much more sensitive, because of the crucial role played by the dissociating radiative flux and the gas shielding.}, added-at = {2017-10-05T10:04:51.000+0200}, author = {Lupi, Alessandro and Bovino, Stefano and Capelo, Pedro R. and Volonteri, Marta and Silk, Joseph}, biburl = {https://www.bibsonomy.org/bibtex/20ac99317b2e89c2102de00d913df635e/miki}, description = {[1710.01315] The natural emergence of the correlation between H2 and star formation rate surface densities in galaxy simulations}, interhash = {8b40b21c032b2acd070e87b2719921a2}, intrahash = {0ac99317b2e89c2102de00d913df635e}, keywords = {H2 formation simulations star}, note = {cite arxiv:1710.01315Comment: 20 pages, 19 figures, 3 tables; submitted to MNRAS}, timestamp = {2017-10-05T10:04:51.000+0200}, title = {The natural emergence of the correlation between H2 and star formation rate surface densities in galaxy simulations}, url = {http://arxiv.org/abs/1710.01315}, year = 2017 }