%0 Generic %1 pallottini2019structure %A Pallottini, A. %A Ferrara, A. %A Decataldo, D %A Gallerani, S. %A Vallini, L. %A Carniani, S. %A Behrens, C. %A Kohandel, M. %A Salvadori, S. %D 2019 %K library %T Deep into the structure of the first galaxies: SERRA views %U http://arxiv.org/abs/1905.08254 %X We study the formation and evolution of a sample of Lyman Break Galaxies in the Epoch of Reionization by using high-resolution ($10 \,pc$), cosmological zoom-in simulations part of the SERRA suite. In SERRA, we follow the interstellar medium (ISM) thermo-chemical non-equilibrium evolution, and perform on-the-fly radiative transfer of the interstellar radiation field (ISRF). The simulation outputs are post-processed to compute the emission of far infrared lines (CII, NII, and OIII). At $z=8$, the most massive galaxy, `Freesia', has an age $t_409\,Myr$, stellar mass $M_\star 4.210^9 M_ødot$, and a star formation rate $SFR 11.5\,M_ødotyr^-1$, due to a recent burst. Freesia has two stellar components (A and B) separated by $2.5\, \rm kpc$; other 11 galaxies are found within $56.9 21.6 \, kpc$. The mean ISRF in the Habing band is $G = 7.9\, G_0$ and is spatially uniform; in contrast, the ionisation parameter is $U = 2^+20_-2 10^-3$, and has a patchy distribution peaked at the location of star-forming sites. The resulting ionising escape fraction from Freesia is $f_esc2\%$. While CII emission is extended (radius 1.54 kpc), OIII is concentrated in Freesia-A (0.85 kpc), where the ratio $\Sigma_OIII/\Sigma_CII 10$. As many high-$z$ galaxies, Freesia lies below the local CII-SFR relation. We show that this is the general consequence of a starburst phase (pushing the galaxy above the Kennicutt-Schmidt relation) which disrupts/photodissociates the emitting molecular clouds around star-forming sites. Metallicity has a sub-dominant impact on the amplitude of CII-SFR deviations.

@misc{pallottini2019structure, abstract = {We study the formation and evolution of a sample of Lyman Break Galaxies in the Epoch of Reionization by using high-resolution ($\sim 10 \,{\rm pc}$), cosmological zoom-in simulations part of the SERRA suite. In SERRA, we follow the interstellar medium (ISM) thermo-chemical non-equilibrium evolution, and perform on-the-fly radiative transfer of the interstellar radiation field (ISRF). The simulation outputs are post-processed to compute the emission of far infrared lines ([CII], [NII], and [OIII]). At $z=8$, the most massive galaxy, `Freesia', has an age $t_\star \simeq 409\,{\rm Myr}$, stellar mass $M_{\star} \simeq 4.2\times 10^9 {\rm M}_{\odot}$, and a star formation rate ${\rm SFR} \simeq 11.5\,{\rm M}_{\odot}{\rm yr}^{-1}$, due to a recent burst. Freesia has two stellar components (A and B) separated by $\simeq 2.5\, {\rm kpc}$; other 11 galaxies are found within $56.9 \pm 21.6 \, {\rm kpc}$. The mean ISRF in the Habing band is $G = 7.9\, G_0$ and is spatially uniform; in contrast, the ionisation parameter is $U = 2^{+20}_{-2} \times 10^{-3}$, and has a patchy distribution peaked at the location of star-forming sites. The resulting ionising escape fraction from Freesia is $f_{\rm esc}\simeq 2\%$. While [CII] emission is extended (radius 1.54 kpc), [OIII] is concentrated in Freesia-A (0.85 kpc), where the ratio $\Sigma_{\rm [OIII]}/\Sigma_{\rm [CII]} \simeq 10$. As many high-$z$ galaxies, Freesia lies below the local [CII]-SFR relation. We show that this is the general consequence of a starburst phase (pushing the galaxy above the Kennicutt-Schmidt relation) which disrupts/photodissociates the emitting molecular clouds around star-forming sites. Metallicity has a sub-dominant impact on the amplitude of [CII]-SFR deviations.}, added-at = {2019-05-22T04:37:52.000+0200}, author = {Pallottini, A. and Ferrara, A. and Decataldo, D and Gallerani, S. and Vallini, L. and Carniani, S. and Behrens, C. and Kohandel, M. and Salvadori, S.}, biburl = {https://www.bibsonomy.org/bibtex/268730351b3736990dfd7f34442e8d1dd/gpkulkarni}, description = {Deep into the structure of the first galaxies: SERRA views}, interhash = {ea8fa34d679bac8106e7029ab30fe203}, intrahash = {68730351b3736990dfd7f34442e8d1dd}, keywords = {library}, note = {cite arxiv:1905.08254Comment: 22 pages, 14 figures, accepted by MNRAS}, timestamp = {2019-05-22T04:37:52.000+0200}, title = {Deep into the structure of the first galaxies: SERRA views}, url = {http://arxiv.org/abs/1905.08254}, year = 2019 }