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  The ALMA Spectroscopic Survey in the HUDF: The molecular gas content of galaxies and tensions with IllustrisTNG and the Santa Cruz SAM

Popping, G., Pillepich, A., Somerville, R. S., Decarli, R., Walter, F., Aravena, M., et al. (2019). The ALMA Spectroscopic Survey in the HUDF: The molecular gas content of galaxies and tensions with IllustrisTNG and the Santa Cruz SAM. The Astrophysical Journal, 882(2): 137. doi:10.3847/1538-4357/ab30f2.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-D64E-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-D64F-3
Genre: Journal Article

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 Creators:
Popping, Gergö, Author
Pillepich, Annalisa, Author
Somerville, Rachel S., Author
Decarli, Roberto, Author
Walter, Fabian, Author
Aravena, Manuel, Author
Carilli, Chris, Author
Cox, Pierre, Author
Nelson, Dylan1, Author              
Riechers, Dominik, Author
Weiss, Axel, Author
Boogaard, Leindert, Author
Bouwens, Richard, Author
Contini, Thierry, Author
Cortes, Paulo C., Author
da Cunha, Elisabete, Author
Daddi, Emanuele, Author
Díaz-Santos, Tanio, Author
Diemer, Benedikt, Author
González-López, Jorge, Author
Hernquist, Lars, AuthorIvison, Rob, AuthorLe Fèvre, Olivier, AuthorMarinacci, Federico, AuthorRix, Hans-Walter, AuthorSwinbank, Mark, AuthorVogelsberger, Mark, Authorvan der Werf, Paul, AuthorWagg, Jeff, AuthorYung, L. Y. Aaron, Author more..
Affiliations:
1Galaxy Formation, MPI for Astrophysics, Max Planck Society, ou_2205643              

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 Abstract: 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 α CO = 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 (MH2 > 3 x 1010 M⊙) 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 α CO = 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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 Dates: 2019-09-11
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.3847/1538-4357/ab30f2
Other: LOCALID: 3169331
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 882 (2) Sequence Number: 137 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3