Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field
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 t...
| Κύριοι συγγραφείς: | , , |
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| Μορφή: | Journal article |
| Γλώσσα: | English |
| Έκδοση: |
2005
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| _version_ | 1826294485104984064 |
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| author | Stanway, E McMahon, R Bunker, A |
| author_facet | Stanway, E McMahon, R Bunker, A |
| author_sort | Stanway, E |
| collection | OXFORD |
| description | 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 f v(f λ ∝ λ -2), as would be expected for an unreddened starburst. However, there is evidence for a marginally bluer spectral slope (f λ ∝ 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. © 2005 RAS. |
| first_indexed | 2024-03-07T03:46:22Z |
| format | Journal article |
| id | oxford-uuid:bf9eaa12-c7eb-4729-b657-7d0b932ea1f5 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:46:22Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:bf9eaa12-c7eb-4729-b657-7d0b932ea1f52022-03-27T05:48:43ZNear-infrared properties of i-drop galaxies in the Hubble Ultra Deep FieldJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:bf9eaa12-c7eb-4729-b657-7d0b932ea1f5EnglishSymplectic Elements at Oxford2005Stanway, EMcMahon, RBunker, AWe 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 f v(f λ ∝ λ -2), as would be expected for an unreddened starburst. However, there is evidence for a marginally bluer spectral slope (f λ ∝ 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. © 2005 RAS. |
| spellingShingle | Stanway, E McMahon, R Bunker, A Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field |
| title | Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field |
| title_full | Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field |
| title_fullStr | Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field |
| title_full_unstemmed | Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field |
| title_short | Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field |
| title_sort | near infrared properties of i drop galaxies in the hubble ultra deep field |
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