The Radio Spectra of High Luminosity Compact Symmetric Objects (CSO-2s): Implications for Studies of Compact Jetted Active Galactic Nuclei
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | de la Parra, P. V. Readhead, A. C. S Herbig, T. Kiehlmann, S. Lister, M. L. Pavlidou, V. Reeves, R. A. Siemiginowska, A. Sullivan, A. G. Surti, T. Synani, A. Tassis, K. Taylor, G. B. Wilkinson, P. N. Aller, M. F. Blandford, R. D. Globus, N. Lawrence, C. R. Molina, B. O'Neill, S. Pearson, T. J. |
| author_facet | de la Parra, P. V. Readhead, A. C. S Herbig, T. Kiehlmann, S. Lister, M. L. Pavlidou, V. Reeves, R. A. Siemiginowska, A. Sullivan, A. G. Surti, T. Synani, A. Tassis, K. Taylor, G. B. Wilkinson, P. N. Aller, M. F. Blandford, R. D. Globus, N. Lawrence, C. R. Molina, B. O'Neill, S. Pearson, T. J. |
| contents | This paper addresses, for the first time, a key aspect of the phenomenology of Compact Symmetric Objects (CSOs) -- the characteristics of their radio spectra. We present a radio-spectrum description of a complete sample of high luminosity CSOs (CSO-2s), which shows that they exhibit the \textit{complete} range of spectral types, including flat-spectrum sources ($α\ge -0.5$), steep-spectrum sources ($α< -0.5$), and peaked-spectrum sources. We show that there is no clear correlation between spectral type and size, but there is a correlation between the high-frequency spectral index and both object type and size. We also show that, to avoid biasing the data and to understand the various classes of jetted-AGN involved, the complete range of spectral types should be included in studying the general phenomenology of compact jetted-AGN, and that complete samples must be used, selected over a wide range of frequencies. We discuss examples that demonstrate these points. We find that the high-frequency spectral indices of CSO-2s span $-1.3 <α_{\rm hi} < -0.3$, and hence that radio spectral signatures cannot be used to discriminate definitively between CSO-2s, binary galactic nuclei, and millilensed objects, unless they have $α_{\rm hi} >-0.3$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_13077 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Radio Spectra of High Luminosity Compact Symmetric Objects (CSO-2s): Implications for Studies of Compact Jetted Active Galactic Nuclei de la Parra, P. V. Readhead, A. C. S Herbig, T. Kiehlmann, S. Lister, M. L. Pavlidou, V. Reeves, R. A. Siemiginowska, A. Sullivan, A. G. Surti, T. Synani, A. Tassis, K. Taylor, G. B. Wilkinson, P. N. Aller, M. F. Blandford, R. D. Globus, N. Lawrence, C. R. Molina, B. O'Neill, S. Pearson, T. J. High Energy Astrophysical Phenomena Astrophysics of Galaxies This paper addresses, for the first time, a key aspect of the phenomenology of Compact Symmetric Objects (CSOs) -- the characteristics of their radio spectra. We present a radio-spectrum description of a complete sample of high luminosity CSOs (CSO-2s), which shows that they exhibit the \textit{complete} range of spectral types, including flat-spectrum sources ($α\ge -0.5$), steep-spectrum sources ($α< -0.5$), and peaked-spectrum sources. We show that there is no clear correlation between spectral type and size, but there is a correlation between the high-frequency spectral index and both object type and size. We also show that, to avoid biasing the data and to understand the various classes of jetted-AGN involved, the complete range of spectral types should be included in studying the general phenomenology of compact jetted-AGN, and that complete samples must be used, selected over a wide range of frequencies. We discuss examples that demonstrate these points. We find that the high-frequency spectral indices of CSO-2s span $-1.3 <α_{\rm hi} < -0.3$, and hence that radio spectral signatures cannot be used to discriminate definitively between CSO-2s, binary galactic nuclei, and millilensed objects, unless they have $α_{\rm hi} >-0.3$. |
| title | The Radio Spectra of High Luminosity Compact Symmetric Objects (CSO-2s): Implications for Studies of Compact Jetted Active Galactic Nuclei |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2408.13077 |