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

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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 (R-e) 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 R-e 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 R-e to keep the SFR constant.
Keywords
Space and Planetary Science, Astronomy and Astrophysics, CATALOGS SOURCE IDENTIFICATION, DARK-MATTER HALOES, STELLAR MASS, MAIN-SEQUENCE, GALAXIES, EVOLUTION, ORIGIN, ACCRETION, CANDELS, GAS

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MLA
Lin, Lin, et al. “The Star Formation Rate-Radius Connection : Data and Implications for Wind Strength and Halo Concentration.” ASTROPHYSICAL JOURNAL, vol. 899, no. 2, 2020, doi:10.3847/1538-4357/aba755.
APA
Lin, L., Faber, S. M., Koo, D. C., Salim, S., Dutton, A. A., Fang, J. J., … Hao, L. (2020). The star formation rate-radius connection : data and implications for wind strength and halo concentration. ASTROPHYSICAL JOURNAL, 899(2). https://doi.org/10.3847/1538-4357/aba755
Chicago author-date
Lin, Lin, S. M. Faber, David C. Koo, Samir Salim, Aaron A. Dutton, Jerome J. Fang, Fangzhou Jiang, et al. 2020. “The Star Formation Rate-Radius Connection : Data and Implications for Wind Strength and Halo Concentration.” ASTROPHYSICAL JOURNAL 899 (2). https://doi.org/10.3847/1538-4357/aba755.
Chicago author-date (all authors)
Lin, Lin, S. M. Faber, David C. Koo, Samir Salim, Aaron A. Dutton, Jerome J. Fang, Fangzhou Jiang, Christoph T. Lee, Aldo Rodríguez-Puebla, Arjen van der Wel, Yicheng Guo, Guillermo Barro, Joel R. Primack, Avishai Dekel, Zhu Chen, Yifei Luo, Viraj Pandya, Rachel S. Somerville, Henry C. Ferguson, Susan Kassin, Anton M. Koekemoer, Norman A. Grogin, Audrey Galametz, P. Santini, Hooshang Nayyeri, Mauro Stefanon, Tomas Dahlen, Bahram Mobasher, and Lei Hao. 2020. “The Star Formation Rate-Radius Connection : Data and Implications for Wind Strength and Halo Concentration.” ASTROPHYSICAL JOURNAL 899 (2). doi:10.3847/1538-4357/aba755.
Vancouver
1.
Lin L, Faber SM, Koo DC, Salim S, Dutton AA, Fang JJ, et al. The star formation rate-radius connection : data and implications for wind strength and halo concentration. ASTROPHYSICAL JOURNAL. 2020;899(2).
IEEE
[1]
L. Lin et al., “The star formation rate-radius connection : data and implications for wind strength and halo concentration,” ASTROPHYSICAL JOURNAL, vol. 899, no. 2, 2020.
@article{8677237,
  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 (R-e) 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 R-e 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 R-e to keep the SFR constant.}},
  articleno    = {{93}},
  author       = {{Lin, Lin and Faber, S. M. and Koo, David C. and Salim, Samir and Dutton, Aaron A. and Fang, Jerome J. and Jiang, Fangzhou and Lee, Christoph T. and Rodríguez-Puebla, Aldo and van der Wel, Arjen and Guo, Yicheng and Barro, Guillermo and Primack, Joel R. and Dekel, Avishai and Chen, Zhu and Luo, Yifei and Pandya, Viraj and Somerville, Rachel S. and Ferguson, Henry C. and Kassin, Susan and Koekemoer, Anton M. and Grogin, Norman A. and Galametz, Audrey and Santini, P. and Nayyeri, Hooshang and Stefanon, Mauro and Dahlen, Tomas and Mobasher, Bahram and Hao, Lei}},
  issn         = {{0004-637X}},
  journal      = {{ASTROPHYSICAL JOURNAL}},
  keywords     = {{Space and Planetary Science,Astronomy and Astrophysics,CATALOGS SOURCE IDENTIFICATION,DARK-MATTER HALOES,STELLAR MASS,MAIN-SEQUENCE,GALAXIES,EVOLUTION,ORIGIN,ACCRETION,CANDELS,GAS}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{16}},
  title        = {{The star formation rate-radius connection : data and implications for wind strength and halo concentration}},
  url          = {{http://dx.doi.org/10.3847/1538-4357/aba755}},
  volume       = {{899}},
  year         = {{2020}},
}

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