Stellar populations of lyman break galaxies at Z ≃ 1-3 in the hst/wfc3 early release science observations

R. E. Ryan, N. P. Hathi, S. H. Cohen, R. E. Ryan, S. L. Finkelstein, P. J. McCarthy, Rogier Windhorst, H. Yan, A. M. Koekemoer, M. J. Rutkowski, R. W. O'Connell, A. N. Straughn, B. Balick, H. E. Bond, D. Calzetti, M. J. Disney, M. A. Dopita, Jay A. Frogel, D. N B Hall, J. A. Holtzman & 8 others R. A. Kimble, F. Paresce, A. Saha, J. I. Silk, J. T. Trauger, A. R. Walker, B. C. Whitmore, E. T. Young

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We analyze the spectral energy distributions (SEDs) of Lyman break galaxies (LBGs) at z ≃ 1-3 selected using the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) UVIS channel filters. These HST/WFC3 observations cover about 50 arcmin2 in the GOODS-South field as a part of the WFC3 Early Release Science program. These LBGs at z ≃ 1-3 are selected using dropout selection criteria similar to high-redshift LBGs. The deep multi-band photometry in this field is used to identify best-fit SED models, from which we infer the following results: (1) the photometric redshift estimate of these dropout-selected LBGs is accurate to within few percent; (2) the UV spectral slope β is redder than at high redshift (z > 3), where LBGs are less dusty; (3) on average, LBGs at z ≃ 1-3 are massive, dustier, and more highly star forming, compared to LBGs at higher redshifts with similar luminosities (0.1L* ≲ L ≲ 2.5L*), though their median values are similar within 1σ uncertainties. This could imply that identical dropout selection technique, at all redshifts, finds physically similar galaxies; and (4) the stellar masses of these LBGs are directly proportional to their UV luminosities with a logarithmic slope of ∼0.46, and star formation rates are proportional to their stellar masses with a logarithmic slope of ∼0.90. These relations hold true - within luminosities probed in this study - for LBGs from z ≃ 1.5 to 5. The star-forming galaxies selected using other color-based techniques show similar correlations at z ≃ 2, but to avoid any selection biases, and for direct comparison with LBGs at z > 3, a true Lyman break selection at z ≃ 2 is essential. The future HST UV surveys, both wider and deeper, covering a large luminosity range are important to better understand LBG properties and their evolution.

Original languageEnglish (US)
Article number88
JournalAstrophysical Journal
Volume765
Issue number2
DOIs
StatePublished - Mar 10 2013

Fingerprint

galaxies
dropouts
luminosity
Hubble Space Telescope
energy
cameras
filter
slopes
spectral energy distribution
stellar mass
science
stars
star formation rate
distribution
photometry
coverings
color
filters
estimates
comparison

Keywords

  • galaxies: evolution
  • galaxies: fundamental parameters
  • galaxies: high-redshift
  • ultraviolet: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Ryan, R. E., Hathi, N. P., Cohen, S. H., Ryan, R. E., Finkelstein, S. L., McCarthy, P. J., ... Young, E. T. (2013). Stellar populations of lyman break galaxies at Z ≃ 1-3 in the hst/wfc3 early release science observations. Astrophysical Journal, 765(2), [88]. https://doi.org/10.1088/0004-637X/765/2/88

Stellar populations of lyman break galaxies at Z ≃ 1-3 in the hst/wfc3 early release science observations. / Ryan, R. E.; Hathi, N. P.; Cohen, S. H.; Ryan, R. E.; Finkelstein, S. L.; McCarthy, P. J.; Windhorst, Rogier; Yan, H.; Koekemoer, A. M.; Rutkowski, M. J.; O'Connell, R. W.; Straughn, A. N.; Balick, B.; Bond, H. E.; Calzetti, D.; Disney, M. J.; Dopita, M. A.; Frogel, Jay A.; Hall, D. N B; Holtzman, J. A.; Kimble, R. A.; Paresce, F.; Saha, A.; Silk, J. I.; Trauger, J. T.; Walker, A. R.; Whitmore, B. C.; Young, E. T.

In: Astrophysical Journal, Vol. 765, No. 2, 88, 10.03.2013.

Research output: Contribution to journalArticle

Ryan, RE, Hathi, NP, Cohen, SH, Ryan, RE, Finkelstein, SL, McCarthy, PJ, Windhorst, R, Yan, H, Koekemoer, AM, Rutkowski, MJ, O'Connell, RW, Straughn, AN, Balick, B, Bond, HE, Calzetti, D, Disney, MJ, Dopita, MA, Frogel, JA, Hall, DNB, Holtzman, JA, Kimble, RA, Paresce, F, Saha, A, Silk, JI, Trauger, JT, Walker, AR, Whitmore, BC & Young, ET 2013, 'Stellar populations of lyman break galaxies at Z ≃ 1-3 in the hst/wfc3 early release science observations', Astrophysical Journal, vol. 765, no. 2, 88. https://doi.org/10.1088/0004-637X/765/2/88
Ryan, R. E. ; Hathi, N. P. ; Cohen, S. H. ; Ryan, R. E. ; Finkelstein, S. L. ; McCarthy, P. J. ; Windhorst, Rogier ; Yan, H. ; Koekemoer, A. M. ; Rutkowski, M. J. ; O'Connell, R. W. ; Straughn, A. N. ; Balick, B. ; Bond, H. E. ; Calzetti, D. ; Disney, M. J. ; Dopita, M. A. ; Frogel, Jay A. ; Hall, D. N B ; Holtzman, J. A. ; Kimble, R. A. ; Paresce, F. ; Saha, A. ; Silk, J. I. ; Trauger, J. T. ; Walker, A. R. ; Whitmore, B. C. ; Young, E. T. / Stellar populations of lyman break galaxies at Z ≃ 1-3 in the hst/wfc3 early release science observations. In: Astrophysical Journal. 2013 ; Vol. 765, No. 2.
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AU - Ryan, R. E.

AU - Hathi, N. P.

AU - Cohen, S. H.

AU - Ryan, R. E.

AU - Finkelstein, S. L.

AU - McCarthy, P. J.

AU - Windhorst, Rogier

AU - Yan, H.

AU - Koekemoer, A. M.

AU - Rutkowski, M. J.

AU - O'Connell, R. W.

AU - Straughn, A. N.

AU - Balick, B.

AU - Bond, H. E.

AU - Calzetti, D.

AU - Disney, M. J.

AU - Dopita, M. A.

AU - Frogel, Jay A.

AU - Hall, D. N B

AU - Holtzman, J. A.

AU - Kimble, R. A.

AU - Paresce, F.

AU - Saha, A.

AU - Silk, J. I.

AU - Trauger, J. T.

AU - Walker, A. R.

AU - Whitmore, B. C.

AU - Young, E. T.

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N2 - We analyze the spectral energy distributions (SEDs) of Lyman break galaxies (LBGs) at z ≃ 1-3 selected using the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) UVIS channel filters. These HST/WFC3 observations cover about 50 arcmin2 in the GOODS-South field as a part of the WFC3 Early Release Science program. These LBGs at z ≃ 1-3 are selected using dropout selection criteria similar to high-redshift LBGs. The deep multi-band photometry in this field is used to identify best-fit SED models, from which we infer the following results: (1) the photometric redshift estimate of these dropout-selected LBGs is accurate to within few percent; (2) the UV spectral slope β is redder than at high redshift (z > 3), where LBGs are less dusty; (3) on average, LBGs at z ≃ 1-3 are massive, dustier, and more highly star forming, compared to LBGs at higher redshifts with similar luminosities (0.1L* ≲ L ≲ 2.5L*), though their median values are similar within 1σ uncertainties. This could imply that identical dropout selection technique, at all redshifts, finds physically similar galaxies; and (4) the stellar masses of these LBGs are directly proportional to their UV luminosities with a logarithmic slope of ∼0.46, and star formation rates are proportional to their stellar masses with a logarithmic slope of ∼0.90. These relations hold true - within luminosities probed in this study - for LBGs from z ≃ 1.5 to 5. The star-forming galaxies selected using other color-based techniques show similar correlations at z ≃ 2, but to avoid any selection biases, and for direct comparison with LBGs at z > 3, a true Lyman break selection at z ≃ 2 is essential. The future HST UV surveys, both wider and deeper, covering a large luminosity range are important to better understand LBG properties and their evolution.

AB - We analyze the spectral energy distributions (SEDs) of Lyman break galaxies (LBGs) at z ≃ 1-3 selected using the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) UVIS channel filters. These HST/WFC3 observations cover about 50 arcmin2 in the GOODS-South field as a part of the WFC3 Early Release Science program. These LBGs at z ≃ 1-3 are selected using dropout selection criteria similar to high-redshift LBGs. The deep multi-band photometry in this field is used to identify best-fit SED models, from which we infer the following results: (1) the photometric redshift estimate of these dropout-selected LBGs is accurate to within few percent; (2) the UV spectral slope β is redder than at high redshift (z > 3), where LBGs are less dusty; (3) on average, LBGs at z ≃ 1-3 are massive, dustier, and more highly star forming, compared to LBGs at higher redshifts with similar luminosities (0.1L* ≲ L ≲ 2.5L*), though their median values are similar within 1σ uncertainties. This could imply that identical dropout selection technique, at all redshifts, finds physically similar galaxies; and (4) the stellar masses of these LBGs are directly proportional to their UV luminosities with a logarithmic slope of ∼0.46, and star formation rates are proportional to their stellar masses with a logarithmic slope of ∼0.90. These relations hold true - within luminosities probed in this study - for LBGs from z ≃ 1.5 to 5. The star-forming galaxies selected using other color-based techniques show similar correlations at z ≃ 2, but to avoid any selection biases, and for direct comparison with LBGs at z > 3, a true Lyman break selection at z ≃ 2 is essential. The future HST UV surveys, both wider and deeper, covering a large luminosity range are important to better understand LBG properties and their evolution.

KW - galaxies: evolution

KW - galaxies: fundamental parameters

KW - galaxies: high-redshift

KW - ultraviolet: galaxies

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