The CHILES Continuum and Polarization Survey. II. Radio Continuum Source Catalog and Radio Properties
The COSMOS H I Large Extragalactic Survey (CHILES) Continuum and Polarization survey is an ultradeep continuum imaging study of the COSMOS field conducted using the Karl G. Jansky Very Large Array. We obtained 1000 hr of L -band ( λ = 20 cm) observations across four spectral windows (SPWs; 1.063–1....
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-3881/adde56 |
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| author | Hansung B. Gim Min S. Yun Nicholas M. Luber Emmanuel Momjian D. J. Pisano Kelley M. Hess Julia Blue Bird Lucas Hunt |
| author_facet | Hansung B. Gim Min S. Yun Nicholas M. Luber Emmanuel Momjian D. J. Pisano Kelley M. Hess Julia Blue Bird Lucas Hunt |
| author_sort | Hansung B. Gim |
| collection | DOAJ |
| description | The COSMOS H I Large Extragalactic Survey (CHILES) Continuum and Polarization survey is an ultradeep continuum imaging study of the COSMOS field conducted using the Karl G. Jansky Very Large Array. We obtained 1000 hr of L -band ( λ = 20 cm) observations across four spectral windows (SPWs; 1.063–1.831 GHz) in a single pointing and produced a confusion-limited image with an apparent rms noise of 1.67 μ Jy beam ^−1 with a synthesized beam of 5 $\mathop{.}\limits^{^{\prime\prime} }$ 5 × 5 $\mathop{.}\limits^{^{\prime\prime} }$ 0. This paper reports a 1.4 GHz radio continuum source catalog containing 1678 sources detected above 7 σ (flux densities greater than 11.7 μ Jy), identified using two independent source extraction programs applied to the Stokes I image. Resolved sources dominate at flux density S _1.4GHz ≥ 42 μ Jy. The radio spectral index for each source was derived using a power-law fit across the four SPWs, and we found that a robust spectral index measurement requires a total signal-to-noise ratio of at least 20. Comparisons with previous 1.4 GHz radio continuum surveys show good overall consistency, but evidence for a high degree of catalog incompleteness and the effects of source confusion are evident for some of the earlier studies. |
| format | Article |
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| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astronomical Journal |
| spelling | doaj-art-373e58f3f521477db05c8fc1cf82d2ec2025-08-20T02:38:43ZengIOP PublishingThe Astronomical Journal1538-38812025-01-0117016010.3847/1538-3881/adde56The CHILES Continuum and Polarization Survey. II. Radio Continuum Source Catalog and Radio PropertiesHansung B. Gim0https://orcid.org/0000-0003-1436-7658Min S. Yun1https://orcid.org/0000-0001-7095-7543Nicholas M. Luber2Emmanuel Momjian3https://orcid.org/0000-0003-3168-5922D. J. Pisano4https://orcid.org/0000-0001-7996-7860Kelley M. Hess5https://orcid.org/0000-0001-9662-9089Julia Blue Bird6https://orcid.org/0000-0002-9627-7519Lucas Hunt7https://orcid.org/0000-0001-8587-9285Department of Physics, Montana State University , Bozeman, MT 59717, USA ; hansung.b.gim@gmail.com; Department of Astronomy, University of Massachusetts , Amherst, MA 01003, USA; Eureka Scientific , 2452 Delmer Street, Suite 100, Oakland, CA 94602, USADepartment of Astronomy, University of Massachusetts , Amherst, MA 01003, USADepartment of Astronomy, Columbia University , Mail Code 5247, 538 West 120th Street, New York, NY 10027, USANational Radio Astronomy Observatory , P.O. Box O, Socorro, NM 87801, USADepartment of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701, South AfricaDepartment of Space, Earth and Environment, Chalmers University of Technology , Onsala Space Observatory, 43992 Onsala, SwedenNational Radio Astronomy Observatory , P.O. Box O, Socorro, NM 87801, USANational Radio Astronomy Observatory , P.O. Box O, Socorro, NM 87801, USAThe COSMOS H I Large Extragalactic Survey (CHILES) Continuum and Polarization survey is an ultradeep continuum imaging study of the COSMOS field conducted using the Karl G. Jansky Very Large Array. We obtained 1000 hr of L -band ( λ = 20 cm) observations across four spectral windows (SPWs; 1.063–1.831 GHz) in a single pointing and produced a confusion-limited image with an apparent rms noise of 1.67 μ Jy beam ^−1 with a synthesized beam of 5 $\mathop{.}\limits^{^{\prime\prime} }$ 5 × 5 $\mathop{.}\limits^{^{\prime\prime} }$ 0. This paper reports a 1.4 GHz radio continuum source catalog containing 1678 sources detected above 7 σ (flux densities greater than 11.7 μ Jy), identified using two independent source extraction programs applied to the Stokes I image. Resolved sources dominate at flux density S _1.4GHz ≥ 42 μ Jy. The radio spectral index for each source was derived using a power-law fit across the four SPWs, and we found that a robust spectral index measurement requires a total signal-to-noise ratio of at least 20. Comparisons with previous 1.4 GHz radio continuum surveys show good overall consistency, but evidence for a high degree of catalog incompleteness and the effects of source confusion are evident for some of the earlier studies.https://doi.org/10.3847/1538-3881/adde56SurveysRadio continuum emissionExtragalactic radio sources |
| spellingShingle | Hansung B. Gim Min S. Yun Nicholas M. Luber Emmanuel Momjian D. J. Pisano Kelley M. Hess Julia Blue Bird Lucas Hunt The CHILES Continuum and Polarization Survey. II. Radio Continuum Source Catalog and Radio Properties The Astronomical Journal Surveys Radio continuum emission Extragalactic radio sources |
| title | The CHILES Continuum and Polarization Survey. II. Radio Continuum Source Catalog and Radio Properties |
| title_full | The CHILES Continuum and Polarization Survey. II. Radio Continuum Source Catalog and Radio Properties |
| title_fullStr | The CHILES Continuum and Polarization Survey. II. Radio Continuum Source Catalog and Radio Properties |
| title_full_unstemmed | The CHILES Continuum and Polarization Survey. II. Radio Continuum Source Catalog and Radio Properties |
| title_short | The CHILES Continuum and Polarization Survey. II. Radio Continuum Source Catalog and Radio Properties |
| title_sort | chiles continuum and polarization survey ii radio continuum source catalog and radio properties |
| topic | Surveys Radio continuum emission Extragalactic radio sources |
| url | https://doi.org/10.3847/1538-3881/adde56 |
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