Hierarchical fragmentation in high redshift galaxies revealed by hydrodynamical simulations. Faure, B., Bournaud, F., Fensch, J., Daddi, E., Behrendt, M., Burkert, A., & Richard, J. arXiv e-prints, 2101:arXiv:2101.11013, January, 2021. ![Hierarchical fragmentation in high redshift galaxies revealed by hydrodynamical simulations [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex High-redshift star-forming galaxies have very different morphologies compared to nearby ones. Indeed, they are often dominated by bright star-forming structures of masses up to \$10{\textasciicircum}\{8-9\}\$ \${\textbackslash}mathrm\{M\}_{\textbackslash}odot\$ dubbed «giant clumps». However, recent observations questioned this result by showing only low-mass structures or no structure at all. We use Adaptative Mesh Refinement hydrodynamical simulations of galaxies with parsec-scale resolution to study the formation of structures inside clumpy high-redshift galaxies. We show that in very gas-rich galaxies star formation occurs in small gas clusters with masses below \$10{\textasciicircum}\{7-8\}\$ \${\textbackslash}mathrm\{M\}_{\textbackslash}odot\$ that are themselves located inside giant complexes with masses up to \$10{\textasciicircum}8\$ and sometimes \$10{\textasciicircum}9\$ \${\textbackslash}mathrm\{M\}_{\textbackslash}odot\$. Those massive structures are similar in mass and size to the giant clumps observed in imaging surveys, in particular with the Hubble Space Telescope. Using mock observations of simulated galaxies, we show that at very high resolution with instruments like the Atacama Large Millimeter Array or through gravitational lensing, only low-mass structures are likely to be detected, and their gathering into giant complexes might be missed. This leads to the non-detection of the giant clumps and therefore introduces a bias in the detection of these structures. We show that the simulated giant clumps can be gravitationally bound even when undetected in mocks representative for ALMA observations and HST observations of lensed galaxies. We then compare the top-down fragmentation of an initially warm disc and the bottom-up fragmentation of an initially cold disc to show that the process of formation of the clumps does not impact their physical properties.
@article{faure_hierarchical_2021,
title = {Hierarchical fragmentation in high redshift galaxies revealed by hydrodynamical simulations},
volume = {2101},
url = {http://adsabs.harvard.edu/abs/2021arXiv210111013F},
abstract = {High-redshift star-forming galaxies have very different morphologies
compared to nearby ones. Indeed, they are often dominated by bright
star-forming structures of masses up to \$10{\textasciicircum}\{8-9\}\$ \${\textbackslash}mathrm\{M\}\_{\textbackslash}odot\$
dubbed «giant clumps». However, recent observations
questioned this result by showing only low-mass structures or no
structure at all. We use Adaptative Mesh Refinement hydrodynamical
simulations of galaxies with parsec-scale resolution to study the
formation of structures inside clumpy high-redshift galaxies. We show
that in very gas-rich galaxies star formation occurs in small gas
clusters with masses below \$10{\textasciicircum}\{7-8\}\$ \${\textbackslash}mathrm\{M\}\_{\textbackslash}odot\$ that are
themselves located inside giant complexes with masses up to \$10{\textasciicircum}8\$ and
sometimes \$10{\textasciicircum}9\$ \${\textbackslash}mathrm\{M\}\_{\textbackslash}odot\$. Those massive structures are
similar in mass and size to the giant clumps observed in imaging
surveys, in particular with the Hubble Space Telescope. Using mock
observations of simulated galaxies, we show that at very high resolution
with instruments like the Atacama Large Millimeter Array or through
gravitational lensing, only low-mass structures are likely to be
detected, and their gathering into giant complexes might be missed. This
leads to the non-detection of the giant clumps and therefore introduces
a bias in the detection of these structures. We show that the simulated
giant clumps can be gravitationally bound even when undetected in mocks
representative for ALMA observations and HST observations of lensed
galaxies. We then compare the top-down fragmentation of an initially
warm disc and the bottom-up fragmentation of an initially cold disc to
show that the process of formation of the clumps does not impact their
physical properties.},
urldate = {2021-02-08},
journal = {arXiv e-prints},
author = {Faure, Baptiste and Bournaud, Frédéric and Fensch, Jérémy and Daddi, Emanuele and Behrendt, Manuel and Burkert, Andreas and Richard, Johan},
month = jan,
year = {2021},
keywords = {Astrophysics - Astrophysics of Galaxies},
pages = {arXiv:2101.11013},
}
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We use Adaptative Mesh Refinement hydrodynamical simulations of galaxies with parsec-scale resolution to study the formation of structures inside clumpy high-redshift galaxies. We show that in very gas-rich galaxies star formation occurs in small gas clusters with masses below \\$10{\\textasciicircum}\\{7-8\\}\\$ \\${\\textbackslash}mathrm\\{M\\}_{\\textbackslash}odot\\$ that are themselves located inside giant complexes with masses up to \\$10{\\textasciicircum}8\\$ and sometimes \\$10{\\textasciicircum}9\\$ \\${\\textbackslash}mathrm\\{M\\}_{\\textbackslash}odot\\$. Those massive structures are similar in mass and size to the giant clumps observed in imaging surveys, in particular with the Hubble Space Telescope. Using mock observations of simulated galaxies, we show that at very high resolution with instruments like the Atacama Large Millimeter Array or through gravitational lensing, only low-mass structures are likely to be detected, and their gathering into giant complexes might be missed. This leads to the non-detection of the giant clumps and therefore introduces a bias in the detection of these structures. We show that the simulated giant clumps can be gravitationally bound even when undetected in mocks representative for ALMA observations and HST observations of lensed galaxies. We then compare the top-down fragmentation of an initially warm disc and the bottom-up fragmentation of an initially cold disc to show that the process of formation of the clumps does not impact their physical properties.","urldate":"2021-02-08","journal":"arXiv e-prints","author":[{"propositions":[],"lastnames":["Faure"],"firstnames":["Baptiste"],"suffixes":[]},{"propositions":[],"lastnames":["Bournaud"],"firstnames":["Frédéric"],"suffixes":[]},{"propositions":[],"lastnames":["Fensch"],"firstnames":["Jérémy"],"suffixes":[]},{"propositions":[],"lastnames":["Daddi"],"firstnames":["Emanuele"],"suffixes":[]},{"propositions":[],"lastnames":["Behrendt"],"firstnames":["Manuel"],"suffixes":[]},{"propositions":[],"lastnames":["Burkert"],"firstnames":["Andreas"],"suffixes":[]},{"propositions":[],"lastnames":["Richard"],"firstnames":["Johan"],"suffixes":[]}],"month":"January","year":"2021","keywords":"Astrophysics - Astrophysics of Galaxies","pages":"arXiv:2101.11013","bibtex":"@article{faure_hierarchical_2021,\n\ttitle = {Hierarchical fragmentation in high redshift galaxies revealed by hydrodynamical simulations},\n\tvolume = {2101},\n\turl = {http://adsabs.harvard.edu/abs/2021arXiv210111013F},\n\tabstract = {High-redshift star-forming galaxies have very different morphologies \ncompared to nearby ones. Indeed, they are often dominated by bright\nstar-forming structures of masses up to \\$10{\\textasciicircum}\\{8-9\\}\\$ \\${\\textbackslash}mathrm\\{M\\}\\_{\\textbackslash}odot\\$\ndubbed «giant clumps». However, recent observations\nquestioned this result by showing only low-mass structures or no\nstructure at all. We use Adaptative Mesh Refinement hydrodynamical\nsimulations of galaxies with parsec-scale resolution to study the\nformation of structures inside clumpy high-redshift galaxies. We show\nthat in very gas-rich galaxies star formation occurs in small gas\nclusters with masses below \\$10{\\textasciicircum}\\{7-8\\}\\$ \\${\\textbackslash}mathrm\\{M\\}\\_{\\textbackslash}odot\\$ that are\nthemselves located inside giant complexes with masses up to \\$10{\\textasciicircum}8\\$ and\nsometimes \\$10{\\textasciicircum}9\\$ \\${\\textbackslash}mathrm\\{M\\}\\_{\\textbackslash}odot\\$. Those massive structures are\nsimilar in mass and size to the giant clumps observed in imaging\nsurveys, in particular with the Hubble Space Telescope. Using mock\nobservations of simulated galaxies, we show that at very high resolution\nwith instruments like the Atacama Large Millimeter Array or through\ngravitational lensing, only low-mass structures are likely to be\ndetected, and their gathering into giant complexes might be missed. This\nleads to the non-detection of the giant clumps and therefore introduces\na bias in the detection of these structures. We show that the simulated\ngiant clumps can be gravitationally bound even when undetected in mocks\nrepresentative for ALMA observations and HST observations of lensed\ngalaxies. We then compare the top-down fragmentation of an initially\nwarm disc and the bottom-up fragmentation of an initially cold disc to\nshow that the process of formation of the clumps does not impact their\nphysical properties.},\n\turldate = {2021-02-08},\n\tjournal = {arXiv e-prints},\n\tauthor = {Faure, Baptiste and Bournaud, Frédéric and Fensch, Jérémy and Daddi, Emanuele and Behrendt, Manuel and Burkert, Andreas and Richard, Johan},\n\tmonth = jan,\n\tyear = {2021},\n\tkeywords = {Astrophysics - Astrophysics of Galaxies},\n\tpages = {arXiv:2101.11013},\n}\n\n","author_short":["Faure, B.","Bournaud, F.","Fensch, J.","Daddi, E.","Behrendt, M.","Burkert, A.","Richard, J."],"key":"faure_hierarchical_2021","id":"faure_hierarchical_2021","bibbaseid":"faure-bournaud-fensch-daddi-behrendt-burkert-richard-hierarchicalfragmentationinhighredshiftgalaxiesrevealedbyhydrodynamicalsimulations-2021","role":"author","urls":{"Paper":"http://adsabs.harvard.edu/abs/2021arXiv210111013F"},"keyword":["Astrophysics - Astrophysics of Galaxies"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/polyphant","dataSources":["7gvjSdWrEu7z5vjjj"],"keywords":["astrophysics - astrophysics of galaxies"],"search_terms":["hierarchical","fragmentation","high","redshift","galaxies","revealed","hydrodynamical","simulations","faure","bournaud","fensch","daddi","behrendt","burkert","richard"],"title":"Hierarchical fragmentation in high redshift galaxies revealed by hydrodynamical simulations","year":2021}