The ages, masses and star formation rates of spectroscopically confirmed z 6 galaxies in candels

E. Curtis-Lake, R. J. McLure, J. S. Dunlop, M. Schenker, A. B. Rogers, T. Targett, M. Cirasuolo, O. Almaini, M. L N Ashby, E. J. Bradshaw, S. L. Finkelstein, M. Dickinson, R. S. Ellis, S. M. Faber, G. G. Fazio, H. C. Ferguson, A. Fontana, N. A. Grogin, W. G. Hartley, D. D. Kocevski & 4 others A. M. Koekemoer, K. Lai, Brant E Robertson, Willner S P Vanzella

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

We report the results of a study exploring the stellar populations of 13 luminous (L > 1.2L), spectroscopically confirmed, galaxies in the redshift interval 5.5 < z < 6.5, all with Hubble Space Telescope (HST) Wide Field Camera 3/infrared and Spitzer Infrared Array Camera imaging from the HST/Cosmic Assembly Near-infrared Deep Survey and Spitzer Extended Deep Survey. Based on fittingthe observed photometry with galaxy spectral energy distribution (SED) templates covering a wide range of different star formation histories, including exponentially increasing star formation rates and a self-consistent treatment of Lyα emission, we find that the derived stellar masses lie within the range of 109<M< 1010 M and are robust to within a factor of 2. In contrast, we confirmprevious reports that the ages of the stellar populations are poorly constrained. Although the best-fitting models for 3/13 of the sample have ages of 300 Myr, the degeneracies introduced by dust extinction mean that only two of these objects actually require a 300 Myr old stellar populat on to reproduce the observed photometry.We also explore SED fittingwith more general, two-component models (burst plus ongoing star formation), thereby relaxing the requirement that the current star formation rate and assembled stellar mass must be coupled, and allow for nebular line+continuumemission. On average, the inclusion of nebular emission leads to lower stellar mass estimates (median offset 0.18 dex), moderately higher specific star formation rates, and allows for a wider range of plausible stellar ages. However, based on our SED modelling, we find no strong evidence for extremely young ages in our sample (i.e. <50 Myr). Finally, considering all of the different star formation histories explored, we find that the median best-fitting ages are of the order of 200-300 Myr and that the objects with the tightest constraints indicate ages in the range of 50-200 Myr

Original languageEnglish (US)
Pages (from-to)302-322
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume429
Issue number1
DOIs
StatePublished - 2013

Fingerprint

star formation rate
spectral energy distribution
stellar mass
star formation
galaxies
Hubble Space Telescope
photometry
cameras
histories
bursts
extinction
coverings
templates
assembly
dust
inclusions
intervals
energy
requirements
estimates

Keywords

  • Evolution - galaxies
  • Formation - galaxies
  • galaxies
  • High-redshift

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Curtis-Lake, E., McLure, R. J., Dunlop, J. S., Schenker, M., Rogers, A. B., Targett, T., ... Vanzella, W. S. P. (2013). The ages, masses and star formation rates of spectroscopically confirmed z 6 galaxies in candels. Monthly Notices of the Royal Astronomical Society, 429(1), 302-322. https://doi.org/10.1093/mnras/sts338

The ages, masses and star formation rates of spectroscopically confirmed z 6 galaxies in candels. / Curtis-Lake, E.; McLure, R. J.; Dunlop, J. S.; Schenker, M.; Rogers, A. B.; Targett, T.; Cirasuolo, M.; Almaini, O.; Ashby, M. L N; Bradshaw, E. J.; Finkelstein, S. L.; Dickinson, M.; Ellis, R. S.; Faber, S. M.; Fazio, G. G.; Ferguson, H. C.; Fontana, A.; Grogin, N. A.; Hartley, W. G.; Kocevski, D. D.; Koekemoer, A. M.; Lai, K.; Robertson, Brant E; Vanzella, Willner S P.

In: Monthly Notices of the Royal Astronomical Society, Vol. 429, No. 1, 2013, p. 302-322.

Research output: Contribution to journalArticle

Curtis-Lake, E, McLure, RJ, Dunlop, JS, Schenker, M, Rogers, AB, Targett, T, Cirasuolo, M, Almaini, O, Ashby, MLN, Bradshaw, EJ, Finkelstein, SL, Dickinson, M, Ellis, RS, Faber, SM, Fazio, GG, Ferguson, HC, Fontana, A, Grogin, NA, Hartley, WG, Kocevski, DD, Koekemoer, AM, Lai, K, Robertson, BE & Vanzella, WSP 2013, 'The ages, masses and star formation rates of spectroscopically confirmed z 6 galaxies in candels', Monthly Notices of the Royal Astronomical Society, vol. 429, no. 1, pp. 302-322. https://doi.org/10.1093/mnras/sts338
Curtis-Lake, E. ; McLure, R. J. ; Dunlop, J. S. ; Schenker, M. ; Rogers, A. B. ; Targett, T. ; Cirasuolo, M. ; Almaini, O. ; Ashby, M. L N ; Bradshaw, E. J. ; Finkelstein, S. L. ; Dickinson, M. ; Ellis, R. S. ; Faber, S. M. ; Fazio, G. G. ; Ferguson, H. C. ; Fontana, A. ; Grogin, N. A. ; Hartley, W. G. ; Kocevski, D. D. ; Koekemoer, A. M. ; Lai, K. ; Robertson, Brant E ; Vanzella, Willner S P. / The ages, masses and star formation rates of spectroscopically confirmed z 6 galaxies in candels. In: Monthly Notices of the Royal Astronomical Society. 2013 ; Vol. 429, No. 1. pp. 302-322.
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abstract = "We report the results of a study exploring the stellar populations of 13 luminous (L > 1.2L), spectroscopically confirmed, galaxies in the redshift interval 5.5 < z < 6.5, all with Hubble Space Telescope (HST) Wide Field Camera 3/infrared and Spitzer Infrared Array Camera imaging from the HST/Cosmic Assembly Near-infrared Deep Survey and Spitzer Extended Deep Survey. Based on fittingthe observed photometry with galaxy spectral energy distribution (SED) templates covering a wide range of different star formation histories, including exponentially increasing star formation rates and a self-consistent treatment of Lyα emission, we find that the derived stellar masses lie within the range of 109<M< 1010 M and are robust to within a factor of 2. In contrast, we confirmprevious reports that the ages of the stellar populations are poorly constrained. Although the best-fitting models for 3/13 of the sample have ages of 300 Myr, the degeneracies introduced by dust extinction mean that only two of these objects actually require a 300 Myr old stellar populat on to reproduce the observed photometry.We also explore SED fittingwith more general, two-component models (burst plus ongoing star formation), thereby relaxing the requirement that the current star formation rate and assembled stellar mass must be coupled, and allow for nebular line+continuumemission. On average, the inclusion of nebular emission leads to lower stellar mass estimates (median offset 0.18 dex), moderately higher specific star formation rates, and allows for a wider range of plausible stellar ages. However, based on our SED modelling, we find no strong evidence for extremely young ages in our sample (i.e. <50 Myr). Finally, considering all of the different star formation histories explored, we find that the median best-fitting ages are of the order of 200-300 Myr and that the objects with the tightest constraints indicate ages in the range of 50-200 Myr",
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T1 - The ages, masses and star formation rates of spectroscopically confirmed z 6 galaxies in candels

AU - Curtis-Lake, E.

AU - McLure, R. J.

AU - Dunlop, J. S.

AU - Schenker, M.

AU - Rogers, A. B.

AU - Targett, T.

AU - Cirasuolo, M.

AU - Almaini, O.

AU - Ashby, M. L N

AU - Bradshaw, E. J.

AU - Finkelstein, S. L.

AU - Dickinson, M.

AU - Ellis, R. S.

AU - Faber, S. M.

AU - Fazio, G. G.

AU - Ferguson, H. C.

AU - Fontana, A.

AU - Grogin, N. A.

AU - Hartley, W. G.

AU - Kocevski, D. D.

AU - Koekemoer, A. M.

AU - Lai, K.

AU - Robertson, Brant E

AU - Vanzella, Willner S P

PY - 2013

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N2 - We report the results of a study exploring the stellar populations of 13 luminous (L > 1.2L), spectroscopically confirmed, galaxies in the redshift interval 5.5 < z < 6.5, all with Hubble Space Telescope (HST) Wide Field Camera 3/infrared and Spitzer Infrared Array Camera imaging from the HST/Cosmic Assembly Near-infrared Deep Survey and Spitzer Extended Deep Survey. Based on fittingthe observed photometry with galaxy spectral energy distribution (SED) templates covering a wide range of different star formation histories, including exponentially increasing star formation rates and a self-consistent treatment of Lyα emission, we find that the derived stellar masses lie within the range of 109<M< 1010 M and are robust to within a factor of 2. In contrast, we confirmprevious reports that the ages of the stellar populations are poorly constrained. Although the best-fitting models for 3/13 of the sample have ages of 300 Myr, the degeneracies introduced by dust extinction mean that only two of these objects actually require a 300 Myr old stellar populat on to reproduce the observed photometry.We also explore SED fittingwith more general, two-component models (burst plus ongoing star formation), thereby relaxing the requirement that the current star formation rate and assembled stellar mass must be coupled, and allow for nebular line+continuumemission. On average, the inclusion of nebular emission leads to lower stellar mass estimates (median offset 0.18 dex), moderately higher specific star formation rates, and allows for a wider range of plausible stellar ages. However, based on our SED modelling, we find no strong evidence for extremely young ages in our sample (i.e. <50 Myr). Finally, considering all of the different star formation histories explored, we find that the median best-fitting ages are of the order of 200-300 Myr and that the objects with the tightest constraints indicate ages in the range of 50-200 Myr

AB - We report the results of a study exploring the stellar populations of 13 luminous (L > 1.2L), spectroscopically confirmed, galaxies in the redshift interval 5.5 < z < 6.5, all with Hubble Space Telescope (HST) Wide Field Camera 3/infrared and Spitzer Infrared Array Camera imaging from the HST/Cosmic Assembly Near-infrared Deep Survey and Spitzer Extended Deep Survey. Based on fittingthe observed photometry with galaxy spectral energy distribution (SED) templates covering a wide range of different star formation histories, including exponentially increasing star formation rates and a self-consistent treatment of Lyα emission, we find that the derived stellar masses lie within the range of 109<M< 1010 M and are robust to within a factor of 2. In contrast, we confirmprevious reports that the ages of the stellar populations are poorly constrained. Although the best-fitting models for 3/13 of the sample have ages of 300 Myr, the degeneracies introduced by dust extinction mean that only two of these objects actually require a 300 Myr old stellar populat on to reproduce the observed photometry.We also explore SED fittingwith more general, two-component models (burst plus ongoing star formation), thereby relaxing the requirement that the current star formation rate and assembled stellar mass must be coupled, and allow for nebular line+continuumemission. On average, the inclusion of nebular emission leads to lower stellar mass estimates (median offset 0.18 dex), moderately higher specific star formation rates, and allows for a wider range of plausible stellar ages. However, based on our SED modelling, we find no strong evidence for extremely young ages in our sample (i.e. <50 Myr). Finally, considering all of the different star formation histories explored, we find that the median best-fitting ages are of the order of 200-300 Myr and that the objects with the tightest constraints indicate ages in the range of 50-200 Myr

KW - Evolution - galaxies

KW - Formation - galaxies

KW - galaxies

KW - High-redshift

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