MIGHTEE polarization early science fields: the deep polarized sky
The MeerKAT International GigaHertz Tiered Extragalactic Exploration (MIGHTEE) is one of the MeerKAT large survey projects, designed to pathfind SKA key science. MIGHTEE is undertaking deep radio imaging of four well-observed fields (COSMOS, XMM-LSS, ELAIS S1, and CDFS) totaling 20 square degrees to...
| প্রধান লেখক: | , , , , , , , , |
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| বিন্যাস: | Journal article |
| ভাষা: | English |
| প্রকাশিত: |
Oxford University Press
2024
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| _version_ | 1826312844466978816 |
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| author | Taylor, AR Sekhar, S Heino, L Scaife, AMM Stil, J Bowles, M Jarvis, M Heywood, I Collier, JD |
| author_facet | Taylor, AR Sekhar, S Heino, L Scaife, AMM Stil, J Bowles, M Jarvis, M Heywood, I Collier, JD |
| author_sort | Taylor, AR |
| collection | OXFORD |
| description | The MeerKAT International GigaHertz Tiered Extragalactic Exploration (MIGHTEE) is one of the MeerKAT large survey projects, designed to pathfind SKA key science. MIGHTEE is undertaking deep radio imaging of four well-observed fields (COSMOS, XMM-LSS, ELAIS S1, and CDFS) totaling 20 square degrees to μJy sensitivities. Broad-band imaging observations between 880 and1690 MHz yield total intensity continuum, spectro-polarimetry, and atomic hydrogen spectral imaging. Early science data from MIGHTEE are being released from initial observations of COSMOS and XMM–LSS. This paper describes the spectro-polarimetric observations, the polarization data processing of the MIGHTEE early science fields, and presents polarization data images and catalogues. The catalogues include radio spectral index, redshift information, and Faraday rotation measure synthesis results for 13 267 total intensity radio sources down to a polarized intensity detection limit of ∼20 μJy bm−1. Polarized signals were detected from 324 sources. For the polarized detections, we include a catalogue of Faraday Depth from both Faraday Synthesis and Q, U fitting, as well as total intensity and polarization spectral indices. The distribution of redshift of the total radio sources and detected polarized sources are the same, with median redshifts of 0.86 and 0.82, respectively. Depolarization of the emission at longer-wavelengths is seen to increase with decreasing total-intensity spectral index, implying that depolarization is intrinsic to the radio sources. No evidence is seen for a redshift dependence of the variance of Faraday depth. |
| first_indexed | 2024-04-09T03:57:36Z |
| format | Journal article |
| id | oxford-uuid:3d3dec95-df3c-486c-b1c3-12974ad97a5a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-09-25T04:03:17Z |
| publishDate | 2024 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:3d3dec95-df3c-486c-b1c3-12974ad97a5a2024-05-08T15:59:41ZMIGHTEE polarization early science fields: the deep polarized skyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:3d3dec95-df3c-486c-b1c3-12974ad97a5aEnglishSymplectic ElementsOxford University Press2024Taylor, ARSekhar, SHeino, LScaife, AMMStil, JBowles, MJarvis, MHeywood, ICollier, JDThe MeerKAT International GigaHertz Tiered Extragalactic Exploration (MIGHTEE) is one of the MeerKAT large survey projects, designed to pathfind SKA key science. MIGHTEE is undertaking deep radio imaging of four well-observed fields (COSMOS, XMM-LSS, ELAIS S1, and CDFS) totaling 20 square degrees to μJy sensitivities. Broad-band imaging observations between 880 and1690 MHz yield total intensity continuum, spectro-polarimetry, and atomic hydrogen spectral imaging. Early science data from MIGHTEE are being released from initial observations of COSMOS and XMM–LSS. This paper describes the spectro-polarimetric observations, the polarization data processing of the MIGHTEE early science fields, and presents polarization data images and catalogues. The catalogues include radio spectral index, redshift information, and Faraday rotation measure synthesis results for 13 267 total intensity radio sources down to a polarized intensity detection limit of ∼20 μJy bm−1. Polarized signals were detected from 324 sources. For the polarized detections, we include a catalogue of Faraday Depth from both Faraday Synthesis and Q, U fitting, as well as total intensity and polarization spectral indices. The distribution of redshift of the total radio sources and detected polarized sources are the same, with median redshifts of 0.86 and 0.82, respectively. Depolarization of the emission at longer-wavelengths is seen to increase with decreasing total-intensity spectral index, implying that depolarization is intrinsic to the radio sources. No evidence is seen for a redshift dependence of the variance of Faraday depth. |
| spellingShingle | Taylor, AR Sekhar, S Heino, L Scaife, AMM Stil, J Bowles, M Jarvis, M Heywood, I Collier, JD MIGHTEE polarization early science fields: the deep polarized sky |
| title | MIGHTEE polarization early science fields: the deep polarized sky |
| title_full | MIGHTEE polarization early science fields: the deep polarized sky |
| title_fullStr | MIGHTEE polarization early science fields: the deep polarized sky |
| title_full_unstemmed | MIGHTEE polarization early science fields: the deep polarized sky |
| title_short | MIGHTEE polarization early science fields: the deep polarized sky |
| title_sort | mightee polarization early science fields the deep polarized sky |
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