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Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field
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Stanway, Elizabeth R., McMahon, R. G. (Richard G.) and Bunker, Andrew J. (Andrew John) (2005) Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field. Monthly Notices of the Royal Astronomical Society, Volume 359 (Number 3). pp. 1184-1192. doi:10.1111/j.1365-2966.2005.08977.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2005.08977.x
Abstract
We analyse near-infrared Hubble Space Telescope (HST)/Near-Infrared Camera and Multi-Object Spectrometer F110W (J) and F160W (H) band photometry of a sample of 27 i′-drop candidate z≃ 6 galaxies in the central region of the HST/Advanced Camera for Surveys Ultra Deep Field. The infrared colours of the 20 objects not affected by near neighbours are consistent with a high-redshift interpretation. This suggests that the low-redshift contamination of this i′-drop sample is smaller than that observed at brighter magnitudes, where values of 10–40 per cent have been reported. The J–H colours are consistent with a slope flat in fν(fλ∝λ−2), as would be expected for an unreddened starburst. However, there is evidence for a marginally bluer spectral slope (fλ∝λ−2.2), which is perhaps indicative of an extremely young starburst (∼10 Myr old) or a top heavy initial mass function and little dust. The low levels of contamination, median photometric redshift of z∼ 6.0 and blue spectral slope, inferred using the near-infrared data, support the validity of the assumptions in our earlier work in estimating the star formation rates, and that the majority of the i-drop candidates galaxies lie at z∼ 6.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Galaxies -- Evolution, Galaxies -- Formation | ||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
Publisher: | Oxford University Press | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 21 May 2005 | ||||
Dates: |
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Volume: | Volume 359 | ||||
Number: | Number 3 | ||||
Page Range: | pp. 1184-1192 | ||||
DOI: | 10.1111/j.1365-2966.2005.08977.x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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