The CHILES Continuum & Polarization Survey-II: Radio Continuum Source Catalog and Radio Properties
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918003798441984 |
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| author | Gim, Hansung B. Yun, Min S. Luber, Nicholas M. Momjian, Emmanuel Pisano, D. J. Hess, Kelley M. Bird, Julia Blue Hunt, Lucas |
| author_facet | Gim, Hansung B. Yun, Min S. Luber, Nicholas M. Momjian, Emmanuel Pisano, D. J. Hess, Kelley M. Bird, Julia Blue Hunt, Lucas |
| contents | The COSMOS HI Large Extragalactic Survey (CHILES) Continuum & Polarization (CHILES Con Pol) survey is an ultra-deep continuum imaging study of the COSMOS field conducted using the Karl G. Jansky Very Large Array. We obtained 1000 hours of L-band ($λ= 20$ cm) observations across four spectral windows (1.063-1.831 GHz) on 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$.\!\!^{\prime\prime}$5$\times$5$.\!\!^{\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} \ge 42 $μ$Jy. Radio spectral index for each source was derived using a power-law fit across the four spectral windows, 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 | Preprint |
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arxiv_https___arxiv_org_abs_2504_20200 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The CHILES Continuum & Polarization Survey-II: Radio Continuum Source Catalog and Radio Properties Gim, Hansung B. Yun, Min S. Luber, Nicholas M. Momjian, Emmanuel Pisano, D. J. Hess, Kelley M. Bird, Julia Blue Hunt, Lucas Astrophysics of Galaxies The COSMOS HI Large Extragalactic Survey (CHILES) Continuum & Polarization (CHILES Con Pol) survey is an ultra-deep continuum imaging study of the COSMOS field conducted using the Karl G. Jansky Very Large Array. We obtained 1000 hours of L-band ($λ= 20$ cm) observations across four spectral windows (1.063-1.831 GHz) on 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$.\!\!^{\prime\prime}$5$\times$5$.\!\!^{\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} \ge 42 $μ$Jy. Radio spectral index for each source was derived using a power-law fit across the four spectral windows, 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. |
| title | The CHILES Continuum & Polarization Survey-II: Radio Continuum Source Catalog and Radio Properties |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.20200 |