Properties of submillimeter galaxies in the candels goods-south field

Tommy Wiklind, Christopher J. Conselice, Tomas Dahlen, Mark E. Dickinson, Henry C. Ferguson, Norman A. Grogin, Yicheng Guo, Anton M. Koekemoer, Bahram Mobasher, Alice Mortlock, Adriano Fontana, Romeel Davé, Haojing Yan, Viviana Acquaviva, Matthew L.N. Ashby, Guillermo Barro, Karina I. Caputi, Marco Castellano, Avishai Dekel, Jennifer L. DonleyGiovanni G. Fazio, Mauro Giavalisco, Andrea Grazian, Nimish P. Hathi, Peter Kurczynski, Yu Lu, Elizabeth J. McGrath, Duilia F. De Mello, Michael Peth, Mohammad Safarzadeh, Mauro Stefanon, Thomas Targett

Research output: Contribution to journalArticle

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Abstract

We derive physical properties of 10 submillimeter galaxies located in the CANDELS coverage of the GOODS-S field. The galaxies were first identified as submillimeter sources with the LABOCA bolometer and subsequently targeted for 870 μm continuum observation with ALMA. The high angular resolution of the ALMA imaging allows secure counterparts to be identified in the CANDELS multiband data set. The CANDELS data provide deep photometric data from UV through near-infrared wavelengths. Using synthetic spectral energy distributions, we derive photometric redshifts, stellar masses, extinction, ages, and the star formation history. The redshift range is z = 1.65-4.76, with two of the galaxies located at z > 4. Two submillimeter galaxy (SMG) counterparts have stellar masses 2-3 orders of magnitude lower than the rest. The remaining SMG counterparts have stellar masses around 1 × 10 11 M. The stellar population in the SMGs is typically older than the expected duration of the submillimeter phase, suggesting that the star formation history of SMGs is more complex than a single burst. Non-parametric morphology indices suggest that the SMG counterparts are among the most asymmetric systems compared with galaxies of the same stellar mass and redshift. The Hubble Space Telescope images show that three of the SMGs are associated with ongoing mergers. The remaining counterparts are isolated. Estimating the dust and molecular gas mass from the submillimeter fluxes, and comparing with our stellar masses shows that the gas mass fraction of SMGs is 28% and that the final stellar mass is likely to be (1-2) × 1011 M.

Original languageEnglish (US)
Article number111
JournalAstrophysical Journal
Volume785
Issue number2
DOIs
StatePublished - Apr 20 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • cosmology: observations
  • galaxies: evolution
  • galaxies: formation
  • galaxies: high-redshift
  • galaxies: photometry

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    Wiklind, T., Conselice, C. J., Dahlen, T., Dickinson, M. E., Ferguson, H. C., Grogin, N. A., Guo, Y., Koekemoer, A. M., Mobasher, B., Mortlock, A., Fontana, A., Davé, R., Yan, H., Acquaviva, V., Ashby, M. L. N., Barro, G., Caputi, K. I., Castellano, M., Dekel, A., ... Targett, T. (2014). Properties of submillimeter galaxies in the candels goods-south field. Astrophysical Journal, 785(2), [111]. https://doi.org/10.1088/0004-637X/785/2/111