%0 Generic %1 jeon2015first %A Jeon, Myoungwon %A Bromm, Volker %A Pawlik, Andreas H. %A Milosavljevic, Milos %D 2015 %K feedback first galaxies %T The first galaxies: simulating their feedback-regulated assembly %U http://arxiv.org/abs/1501.01002 %X We investigate the formation of a galaxy reaching a virial mass of ~10^8 at z~10 by carrying out a zoomed radiation-hydrodynamical cosmological simulation. This simulation traces Population~III (Pop~III) star formation, characterized by a modestly top-heavy initial mass function (IMF), and considers stellar feedback such as photoionization heating from Pop~III and Population~II (Pop~II) stars, mechanical and chemical feedback from supernovae (SNe), and X-ray feedback from accreting black holes (BHs) and high-mass X-ray binaries (HMXBs). We self-consistently impose a transition in star formation mode from top-heavy Pop~III to low-mass Pop~II at the critical metallicity Zcrit=10^-3.5 solar metallicity. We find that the star formation rate in the computational box is dominated by Pop~III until z~13, and by Pop~II thereafter. The intergalactic medium (IGM) is metal-enriched to an average of Zavg=10^-4 solar metallicity at z~10, mainly by pair-instability SNe (PISNe), while 70% of the produced Pop~III stars die in core-collapse SNe (CCSNe). The simulated galaxy experiences bursty star formation, with a substantially reduced gas content due to photoionization heating from Pop~III and Pop~II stars, together with SN feedback. Specifically, this gives rise to a baryon fraction of fbar=0.05 at z~10. All the gas within the simulated galaxy is metal-enriched above 10^-5\zsun, such that there are no remaining pockets of primordial gas. We further estimate the intrinsic luminosity of the simulated galaxy to be L_Bol ~ 5 x 10^6 solar luminosity, corresponding to an observed flux of ~ 10^-3 nJy, which is too low to be detected by the JWST. We also show that our simulated galaxy falls below the observed relation between mean stellar metallicity and total stellar mass for local dwarf galaxies by ~ 1 dex, although this may be an artefact of having missed any subsequent star formation at z <10.

@misc{jeon2015first, abstract = {We investigate the formation of a galaxy reaching a virial mass of ~10^8 at z~10 by carrying out a zoomed radiation-hydrodynamical cosmological simulation. This simulation traces Population~III (Pop~III) star formation, characterized by a modestly top-heavy initial mass function (IMF), and considers stellar feedback such as photoionization heating from Pop~III and Population~II (Pop~II) stars, mechanical and chemical feedback from supernovae (SNe), and X-ray feedback from accreting black holes (BHs) and high-mass X-ray binaries (HMXBs). We self-consistently impose a transition in star formation mode from top-heavy Pop~III to low-mass Pop~II at the critical metallicity Zcrit=10^{-3.5} solar metallicity. We find that the star formation rate in the computational box is dominated by Pop~III until z~13, and by Pop~II thereafter. The intergalactic medium (IGM) is metal-enriched to an average of Zavg=10^{-4} solar metallicity at z~10, mainly by pair-instability SNe (PISNe), while 70% of the produced Pop~III stars die in core-collapse SNe (CCSNe). The simulated galaxy experiences bursty star formation, with a substantially reduced gas content due to photoionization heating from Pop~III and Pop~II stars, together with SN feedback. Specifically, this gives rise to a baryon fraction of fbar=0.05 at z~10. All the gas within the simulated galaxy is metal-enriched above 10^{-5}\zsun, such that there are no remaining pockets of primordial gas. We further estimate the intrinsic luminosity of the simulated galaxy to be L_Bol ~ 5 x 10^6 solar luminosity, corresponding to an observed flux of ~ 10^{-3} nJy, which is too low to be detected by the JWST. We also show that our simulated galaxy falls below the observed relation between mean stellar metallicity and total stellar mass for local dwarf galaxies by ~ 1 dex, although this may be an artefact of having missed any subsequent star formation at z <10.}, added-at = {2015-01-07T09:44:05.000+0100}, author = {Jeon, Myoungwon and Bromm, Volker and Pawlik, Andreas H. and Milosavljevic, Milos}, biburl = {https://www.bibsonomy.org/bibtex/255d2147a7d32ae4850a5f7f31ccb1349/miki}, description = {[1501.01002] The first galaxies: simulating their feedback-regulated assembly}, interhash = {2898d08fea57631d984535d49d7720f8}, intrahash = {55d2147a7d32ae4850a5f7f31ccb1349}, keywords = {feedback first galaxies}, note = {cite arxiv:1501.01002Comment: 18 pages 14 figures, Submitted to MNRAS, "for associated simulation movies, visit http://www.as.utexas.edu/~myjeon/"}, timestamp = {2015-01-07T09:44:05.000+0100}, title = {The first galaxies: simulating their feedback-regulated assembly}, url = {http://arxiv.org/abs/1501.01002}, year = 2015 }