
Discovery of Lyman break galaxies at z ∼ 7 from the zFourGE survey
- Author
- V Tilvi, C Papovich, K-VH Tran, I Labbe, LR Spitler, Caroline Straatman (UGent) , SE Persson, A Monson, K Glazebrook, RF Quadri, P van Dokkum, MLN Ashby, SM Faber, GG Fazio, SL Finkelstein, HC Ferguson, NA Grogin, GG Kacprzak, DD Kelson, AM Koekemoer, D Murphy, PJ McCarthy, JA Newman, B Salmon and SP Willner
- Organization
- Abstract
- Star-forming galaxies at redshiftsz > 6 are likely responsible for the reionization of the universe, and it is important to study the nature of these galaxies. We present three candidates for z similar to 7 Lyman break galaxies (LBGs) from a 155 arcmin(2) area in the CANDELS/COSMOS field imaged by the deep FourStar Galaxy Evolution (zFourGE) survey. The FourStar medium-band filters provide the equivalent of R similar to 10 spectroscopy, which cleanly distinguishes between z similar to 7 LBGs and brown dwarf stars. The distinction between stars and galaxies based on an object's angular size can become unreliable even when using Hubble Space Telescope imaging; there exists at least one very compact z similar to 7 candidate (FWHM similar to 0.5-1 kpc) that is indistinguishable from a point source. The medium-band filters provide narrower redshift distributions compared with broadband-derived redshifts. The UV luminosity function derived using the three z similar to 7 candidates is consistent with previous studies, suggesting an evolution at the bright end (MUV similar to -21.6 mag) from z similar to 7 to z similar to 5. Fitting the galaxies' spectral energy distributions, we predict Ly alpha equivalent widths for the two brightest LBGs, and find that the presence of a Ly alpha line affects the medium-band flux thereby changing the constraints on stellar masses and UV spectral slopes. This illustrates the limitations of deriving LBG properties using only broadband photometry. The derived specific star-formation rates for the bright LBGs are similar to 13 Gyr(-1), slightly higher than the lower-luminosity LBGs, implying that the star-formation rate increases with stellar mass for these galaxies.
- Keywords
- ULTRA-DEEP-FIELD, HUBBLE-SPACE-TELESCOPE, STAR-FORMING GALAXIES, LY-ALPHA EMITTERS, UV LUMINOSITY FUNCTION, STELLAR MASS DENSITY, HIGH-REDSHIFT GALAXIES, EXTRAGALACTIC LEGACY SURVEY, REST-FRAME, ULTRAVIOLET, Z-DROPOUT GALAXIES, galaxies: formation, galaxies: high-redshift, galaxies: luminosity function - mass function, galaxies: star formation
Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8582628
- MLA
- Tilvi, V., et al. “Discovery of Lyman Break Galaxies at z ∼ 7 from the ZFourGE Survey.” ASTROPHYSICAL JOURNAL, vol. 768, no. 1, 2013, doi:10.1088/0004-637X/768/1/56.
- APA
- Tilvi, V., Papovich, C., Tran, K.-V., Labbe, I., Spitler, L., Straatman, C., … Willner, S. (2013). Discovery of Lyman break galaxies at z ∼ 7 from the zFourGE survey. ASTROPHYSICAL JOURNAL, 768(1). https://doi.org/10.1088/0004-637X/768/1/56
- Chicago author-date
- Tilvi, V, C Papovich, K-VH Tran, I Labbe, LR Spitler, Caroline Straatman, SE Persson, et al. 2013. “Discovery of Lyman Break Galaxies at z ∼ 7 from the ZFourGE Survey.” ASTROPHYSICAL JOURNAL 768 (1). https://doi.org/10.1088/0004-637X/768/1/56.
- Chicago author-date (all authors)
- Tilvi, V, C Papovich, K-VH Tran, I Labbe, LR Spitler, Caroline Straatman, SE Persson, A Monson, K Glazebrook, RF Quadri, P van Dokkum, MLN Ashby, SM Faber, GG Fazio, SL Finkelstein, HC Ferguson, NA Grogin, GG Kacprzak, DD Kelson, AM Koekemoer, D Murphy, PJ McCarthy, JA Newman, B Salmon, and SP Willner. 2013. “Discovery of Lyman Break Galaxies at z ∼ 7 from the ZFourGE Survey.” ASTROPHYSICAL JOURNAL 768 (1). doi:10.1088/0004-637X/768/1/56.
- Vancouver
- 1.Tilvi V, Papovich C, Tran K-V, Labbe I, Spitler L, Straatman C, et al. Discovery of Lyman break galaxies at z ∼ 7 from the zFourGE survey. ASTROPHYSICAL JOURNAL. 2013;768(1).
- IEEE
- [1]V. Tilvi et al., “Discovery of Lyman break galaxies at z ∼ 7 from the zFourGE survey,” ASTROPHYSICAL JOURNAL, vol. 768, no. 1, 2013.
@article{8582628, abstract = {{Star-forming galaxies at redshiftsz > 6 are likely responsible for the reionization of the universe, and it is important to study the nature of these galaxies. We present three candidates for z similar to 7 Lyman break galaxies (LBGs) from a 155 arcmin(2) area in the CANDELS/COSMOS field imaged by the deep FourStar Galaxy Evolution (zFourGE) survey. The FourStar medium-band filters provide the equivalent of R similar to 10 spectroscopy, which cleanly distinguishes between z similar to 7 LBGs and brown dwarf stars. The distinction between stars and galaxies based on an object's angular size can become unreliable even when using Hubble Space Telescope imaging; there exists at least one very compact z similar to 7 candidate (FWHM similar to 0.5-1 kpc) that is indistinguishable from a point source. The medium-band filters provide narrower redshift distributions compared with broadband-derived redshifts. The UV luminosity function derived using the three z similar to 7 candidates is consistent with previous studies, suggesting an evolution at the bright end (MUV similar to -21.6 mag) from z similar to 7 to z similar to 5. Fitting the galaxies' spectral energy distributions, we predict Ly alpha equivalent widths for the two brightest LBGs, and find that the presence of a Ly alpha line affects the medium-band flux thereby changing the constraints on stellar masses and UV spectral slopes. This illustrates the limitations of deriving LBG properties using only broadband photometry. The derived specific star-formation rates for the bright LBGs are similar to 13 Gyr(-1), slightly higher than the lower-luminosity LBGs, implying that the star-formation rate increases with stellar mass for these galaxies.}}, articleno = {{56}}, author = {{Tilvi, V and Papovich, C and Tran, K-VH and Labbe, I and Spitler, LR and Straatman, Caroline and Persson, SE and Monson, A and Glazebrook, K and Quadri, RF and van Dokkum, P and Ashby, MLN and Faber, SM and Fazio, GG and Finkelstein, SL and Ferguson, HC and Grogin, NA and Kacprzak, GG and Kelson, DD and Koekemoer, AM and Murphy, D and McCarthy, PJ and Newman, JA and Salmon, B and Willner, SP}}, issn = {{0004-637X}}, journal = {{ASTROPHYSICAL JOURNAL}}, keywords = {{ULTRA-DEEP-FIELD,HUBBLE-SPACE-TELESCOPE,STAR-FORMING GALAXIES,LY-ALPHA EMITTERS,UV LUMINOSITY FUNCTION,STELLAR MASS DENSITY,HIGH-REDSHIFT GALAXIES,EXTRAGALACTIC LEGACY SURVEY,REST-FRAME,ULTRAVIOLET,Z-DROPOUT GALAXIES,galaxies: formation,galaxies: high-redshift,galaxies: luminosity function - mass function,galaxies: star formation}}, language = {{eng}}, number = {{1}}, pages = {{17}}, title = {{Discovery of Lyman break galaxies at z ∼ 7 from the zFourGE survey}}, url = {{http://dx.doi.org/10.1088/0004-637X/768/1/56}}, volume = {{768}}, year = {{2013}}, }
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