Formation of compact galaxies in the Extreme-Horizon simulation. (arXiv:2007.04624v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Chabanier_S/0/1/0/all/0/1">Solène Chabanier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bournaud_F/0/1/0/all/0/1">Frédéric Bournaud</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dubois_Y/0/1/0/all/0/1">Yohan Dubois</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Codis_S/0/1/0/all/0/1">Sandrine Codis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chapon_D/0/1/0/all/0/1">Damien Chapon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Elbaz_D/0/1/0/all/0/1">David Elbaz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pichon_C/0/1/0/all/0/1">Christophe Pichon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bressand_O/0/1/0/all/0/1">Olivier Bressand</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Devriendt_J/0/1/0/all/0/1">Julien Devriendt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gavazzi_R/0/1/0/all/0/1">Raphael Gavazzi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kraljic_K/0/1/0/all/0/1">Katarina Kraljic</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kimm_T/0/1/0/all/0/1">Taysun Kimm</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Laigle_C/0/1/0/all/0/1">Clotilde Laigle</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lekien_J/0/1/0/all/0/1">Jean-Baptiste Lekien</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Martin_G/0/1/0/all/0/1">Garreth Martin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Palanque_Delabrouille_N/0/1/0/all/0/1">Nathalie Palanque-Delabrouille</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Peirani_S/0/1/0/all/0/1">Sébastien Peirani</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Piserchia_P/0/1/0/all/0/1">Pierre-Franck Piserchia</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Slyz_A/0/1/0/all/0/1">Adrianne Slyz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Trebitsch_M/0/1/0/all/0/1">Maxime Trebitsch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yeche_C/0/1/0/all/0/1">Christophe Yèche</a>
We present the Extreme-Horizon (EH) cosmological simulation: EH models galaxy
formation with stellar and AGN feedback and uses a very high resolution in the
intergalactic and circumgalactic medium. The high resolution in low-density
regions results in smaller-size massive galaxies at redshift $z=2$, in better
agreement with observations compared to other simulations. This results from
the improved modeling of cold gas flows accreting onto galaxies. Besides, the
EH simulation forms a population of particularly compact galaxies with stellar
masses of $10^{10-11}$,M$_sun$ that are reminiscent of observed ultracompact
galaxies at $zsimeq2$. These objects form mainly through repeated major
mergers of low-mass progenitors, independently of baryonic feedback mechanisms.
This formation process can be missed in simulations using a too low resolution
in low-density intergalactic regions.
We present the Extreme-Horizon (EH) cosmological simulation: EH models galaxy
formation with stellar and AGN feedback and uses a very high resolution in the
intergalactic and circumgalactic medium. The high resolution in low-density
regions results in smaller-size massive galaxies at redshift $z=2$, in better
agreement with observations compared to other simulations. This results from
the improved modeling of cold gas flows accreting onto galaxies. Besides, the
EH simulation forms a population of particularly compact galaxies with stellar
masses of $10^{10-11}$,M$_sun$ that are reminiscent of observed ultracompact
galaxies at $zsimeq2$. These objects form mainly through repeated major
mergers of low-mass progenitors, independently of baryonic feedback mechanisms.
This formation process can be missed in simulations using a too low resolution
in low-density intergalactic regions.
http://arxiv.org/icons/sfx.gif
