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  The star formation rate–radius connection: data and implications for wind strength and halo concentration

Lin, L., Faber, S. M., Koo, D. C., Salim, S., Dutton, A. A., Fang, J. J., et al. (2020). The star formation rate–radius connection: data and implications for wind strength and halo concentration. The Astrophysical Journal, 899(2): 93. doi:10.3847/1538-4357/aba755.

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The Star Formation Rate-Radius Connection Data and Implications for Wind Strength and Halo Concentration.pdf (Any fulltext), 6MB
 
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 Creators:
Lin, Lin, Author
Faber, S. M., Author
Koo, David C., Author
Salim, Samir, Author
Dutton, Aaron A., Author
Fang, Jerome J., Author
Jiang, Fangzhou, Author
Lee, Christoph T., Author
Rodríguez-Puebla, Aldo, Author
van der Wel, A., Author
Guo, Yicheng, Author
Barro, Guillermo, Author
Primack, Joel R., Author
Dekel, Avishai, Author
Chen, Zhu, Author
Luo, Yifei, Author
Pandya, Viraj, Author
Somerville, Rachel S., Author
Ferguson, Henry C., Author
Kassin, Susan, Author
Koekemoer, Anton M., AuthorGrogin, Norman A., AuthorGalametz, Audrey1, Author              Santini, P., AuthorNayyeri, Hooshang, AuthorStefanon, Mauro, AuthorDahlen, Tomas, AuthorMobasher, Bahram, AuthorHao, Lei, Author more..
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: This paper is one in a series that explores the importance of radius as a second parameter in galaxy evolution. The topic investigated here is the relationship between star formation rate (SFR) and galaxy radius (Re) for main-sequence star-forming galaxies. The key observational result is that, over a wide range of stellar mass and redshift in both CANDELS and SDSS, there is little correlation between SFR and Re at fixed stellar mass. The Kennicutt–Schmidt law, or any similar density-related star formation law, then implies that smaller galaxies must have lower gas fractions than larger galaxies (at fixed M*), and this is supported by observations of gas in local star-forming galaxies. We investigate the implications by adopting the equilibrium "bathtub" model: the ISM gas mass is assumed to be constant over time, and the net SFR is the difference between the accretion rate of gas onto the galaxy from the halo and the outflow rate due to winds. To match the observed null correlation between SFR and radius, the bathtub model requires that smaller galaxies at fixed mass have weaker galactic winds. Our hypothesis is that galaxies are a two-parameter family whose properties are set mainly by halo mass and concentration. These determine the radius and gas accretion rate, which in turn predict how wind strength needs to vary with Re to keep the SFR constant.

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 Dates: 2020-08-17
 Publication Status: Published online
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 Rev. Type: -
 Identifiers: DOI: 10.3847/1538-4357/aba755
Other: LOCALID: 3265189
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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: 899 (2) Sequence Number: 93 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3