FOUR IRAC SOURCES WITH AN EXTREMELY RED H - [3.6] COLOR: PASSIVE OR DUSTY GALAXIES AT z > 4.5?
We report the detection of four IRAC sources in the GOODS-South field with an extremely red color of H - [3.6] > 4.5. The four sources are not detected in the deep Hubble Space Telescope WFC3 H-band image with H limit = 28.3mag. We find that only three types of SED templates can produce such...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
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2011
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| _version_ | 1826290679088676864 |
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| author | Huang, J Zheng, X Rigopoulou, D Magdis, G Fazio, G Wang, T |
| author_facet | Huang, J Zheng, X Rigopoulou, D Magdis, G Fazio, G Wang, T |
| author_sort | Huang, J |
| collection | OXFORD |
| description | We report the detection of four IRAC sources in the GOODS-South field with an extremely red color of H - [3.6] > 4.5. The four sources are not detected in the deep Hubble Space Telescope WFC3 H-band image with H limit = 28.3mag. We find that only three types of SED templates can produce such a red H - [3.6] color: a very dusty SED with the Calzetti extinction of AV = 16mag at z = 0.8; a very dusty SED with the SMC extinction of AV = 8mag at z = 2.0- 2.2; and an 1Gyr SSP with AV ∼0.8 at z = 5.7. We argue that these sources are unlikely dusty galaxies at z ≤ 2.2 based on absent strong MIPS 24 μm emission. The old stellar population model at z > 4.5 remains a possible solution for the 4 sources. At z > 4.5, these sources have stellar masses of log(M */M ⊙) = 10.6-11.2. One source, ERS-1, is also a type-II X-ray QSO with L 2 - 8 keV = 1.6 × 1044 erg s-1. One of the four sources is an X-ray QSO and another one is a HyperLIRG, suggesting a galaxy-merging scenario for the formation of these massive galaxies at high redshifts. © 2011. The American Astronomical Society. All rights reserved. |
| first_indexed | 2024-03-07T02:47:52Z |
| format | Journal article |
| id | oxford-uuid:aca4684d-3b7d-4256-9fb0-314acc51ca25 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:47:52Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:aca4684d-3b7d-4256-9fb0-314acc51ca252022-03-27T03:30:22ZFOUR IRAC SOURCES WITH AN EXTREMELY RED H - [3.6] COLOR: PASSIVE OR DUSTY GALAXIES AT z > 4.5?Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:aca4684d-3b7d-4256-9fb0-314acc51ca25EnglishSymplectic Elements at Oxford2011Huang, JZheng, XRigopoulou, DMagdis, GFazio, GWang, TWe report the detection of four IRAC sources in the GOODS-South field with an extremely red color of H - [3.6] > 4.5. The four sources are not detected in the deep Hubble Space Telescope WFC3 H-band image with H limit = 28.3mag. We find that only three types of SED templates can produce such a red H - [3.6] color: a very dusty SED with the Calzetti extinction of AV = 16mag at z = 0.8; a very dusty SED with the SMC extinction of AV = 8mag at z = 2.0- 2.2; and an 1Gyr SSP with AV ∼0.8 at z = 5.7. We argue that these sources are unlikely dusty galaxies at z ≤ 2.2 based on absent strong MIPS 24 μm emission. The old stellar population model at z > 4.5 remains a possible solution for the 4 sources. At z > 4.5, these sources have stellar masses of log(M */M ⊙) = 10.6-11.2. One source, ERS-1, is also a type-II X-ray QSO with L 2 - 8 keV = 1.6 × 1044 erg s-1. One of the four sources is an X-ray QSO and another one is a HyperLIRG, suggesting a galaxy-merging scenario for the formation of these massive galaxies at high redshifts. © 2011. The American Astronomical Society. All rights reserved. |
| spellingShingle | Huang, J Zheng, X Rigopoulou, D Magdis, G Fazio, G Wang, T FOUR IRAC SOURCES WITH AN EXTREMELY RED H - [3.6] COLOR: PASSIVE OR DUSTY GALAXIES AT z > 4.5? |
| title | FOUR IRAC SOURCES WITH AN EXTREMELY RED H - [3.6] COLOR: PASSIVE OR DUSTY GALAXIES AT z > 4.5? |
| title_full | FOUR IRAC SOURCES WITH AN EXTREMELY RED H - [3.6] COLOR: PASSIVE OR DUSTY GALAXIES AT z > 4.5? |
| title_fullStr | FOUR IRAC SOURCES WITH AN EXTREMELY RED H - [3.6] COLOR: PASSIVE OR DUSTY GALAXIES AT z > 4.5? |
| title_full_unstemmed | FOUR IRAC SOURCES WITH AN EXTREMELY RED H - [3.6] COLOR: PASSIVE OR DUSTY GALAXIES AT z > 4.5? |
| title_short | FOUR IRAC SOURCES WITH AN EXTREMELY RED H - [3.6] COLOR: PASSIVE OR DUSTY GALAXIES AT z > 4.5? |
| title_sort | four irac sources with an extremely red h 3 6 color passive or dusty galaxies at z gt 4 5 |
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