The ALMA spectroscopic survey in the HUDF: the molecular gas content of galaxies and tensions with IllustrisTNG and the Santa Cruz SAM
The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) provides new constraints for galaxy formation models on the molecular gas properties of galaxies. We compare results from ASPECS to predictions from two cosmological galaxy formation models: the IllustrisTNG hydrodynamical simulat...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2019 September 11
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| In: |
The astrophysical journal
Year: 2019, Jahrgang: 882, Heft: 2, Pages: 1-25 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/ab30f2 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-4357/ab30f2
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| Verfasserangaben: | Gergö Popping, Annalisa Pillepich, Rachel S. Somerville, Roberto Decarli, Fabian Walter, Manuel Aravena, Chris Carilli, Pierre Cox, Dylan Nelson, Dominik Riechers, Axel Weiss, Leindert Boogaard, Richard Bouwens, Thierry Contini, Paulo C. Cortes, Elisabete da Cunha, Emanuele Daddi, Tanio Díaz-Santos, Benedikt Diemer, Jorge González-López, Lars Hernquist, Rob Ivison, Olivier Le Fèvre, Federico Marinacci, Hans-Walter Rix, Mark Swinbank, Mark Vogelsberger, Paul van der Werf, Jeff Wagg and L.Y. Aaron Yung |
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| 245 | 1 | 4 | |a The ALMA spectroscopic survey in the HUDF |b the molecular gas content of galaxies and tensions with IllustrisTNG and the Santa Cruz SAM |c Gergö Popping, Annalisa Pillepich, Rachel S. Somerville, Roberto Decarli, Fabian Walter, Manuel Aravena, Chris Carilli, Pierre Cox, Dylan Nelson, Dominik Riechers, Axel Weiss, Leindert Boogaard, Richard Bouwens, Thierry Contini, Paulo C. Cortes, Elisabete da Cunha, Emanuele Daddi, Tanio Díaz-Santos, Benedikt Diemer, Jorge González-López, Lars Hernquist, Rob Ivison, Olivier Le Fèvre, Federico Marinacci, Hans-Walter Rix, Mark Swinbank, Mark Vogelsberger, Paul van der Werf, Jeff Wagg and L.Y. Aaron Yung |
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| 520 | |a The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) provides new constraints for galaxy formation models on the molecular gas properties of galaxies. We compare results from ASPECS to predictions from two cosmological galaxy formation models: the IllustrisTNG hydrodynamical simulations and the Santa Cruz semianalytic model (SC SAM). We explore several recipes to model the H2 content of galaxies, finding them to be consistent with one another, and take into account the sensitivity limits and survey area of ASPECS. For a canonical CO-to-H2 conversion factor of αCO = 3.6 M⊙/(K km s−1 pc2) the results of our work include: (1) the H2 mass of z > 1 galaxies predicted by the models as a function of their stellar mass is a factor of 2-3 lower than observed; (2) the models do not reproduce the number of H2-rich () galaxies observed by ASPECS; (3) the H2 cosmic density evolution predicted by IllustrisTNG (the SC SAM) is in tension (in tension but with less disagreement than IllustrisTNG) with the observed cosmic density, even after accounting for the ASPECS selection function and field-to-field variance effects. The tension between models and observations at z > 1 can be alleviated by adopting a CO-to-H2 conversion factor in the range αCO = 2.0-0.8 M⊙/(K km s−1 pc2). Additional work on constraining the CO-to-H2 conversion factor and CO excitation conditions of galaxies through observations and theory will be necessary to more robustly test the success of galaxy formation models. | ||
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