PKS 1424-418: A persistent candidate source of the mm$-γ$-ray connection?
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2024
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| author | Kim, Dae-Won Ros, Eduardo Kadler, Matthias Krichbaum, Thomas P. Zhao, Guang-Yao Rösch, Florian Lobanov, Andrei P. Zensus, J. Anton |
| author_facet | Kim, Dae-Won Ros, Eduardo Kadler, Matthias Krichbaum, Thomas P. Zhao, Guang-Yao Rösch, Florian Lobanov, Andrei P. Zensus, J. Anton |
| contents | We present a long-term strong correlation between millimeter (mm) radio and $γ$-ray emission in the flat-spectrum radio quasar (FSRQ) PKS 1424-418. The mm$-γ$-ray connection in blazars is generally thought to originate from the relativistic jet close to the central engine. We confirm a unique long-lasting mm$-γ$-ray correlation of PKS 1424-418 by using detailed correlation analyses and statistical tests, and we find its physical meaning in the source. We employed ~8.5 yr of (sub)mm and $γ$-ray light curves observed by ALMA and Fermi-LAT, respectively. From linear and cross-correlation analyses between the light curves, we found a significant, strong mm$-γ$-ray correlation over the whole period. We did not find any notable time delay within the uncertainties for the mm$-γ$-ray correlation, which means zero lag. The mm wave spectral index values (S$_ν$ $\propto$ $ν_α$) between the band 3 and 7 flux densities indicate a time-variable opacity of the source at (sub)mm wavelengths. Interestingly, the mm wave spectral index becomes temporarily flatter (i.e., $α$ > $-$0.5) when the source flares in the $γ$-rays. We relate our results with the jet of PKS 1424-418, and we discuss the origin of the $γ$-rays and opacity of the inner (sub)parsec-scale jet regions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_19737 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | PKS 1424-418: A persistent candidate source of the mm$-γ$-ray connection? Kim, Dae-Won Ros, Eduardo Kadler, Matthias Krichbaum, Thomas P. Zhao, Guang-Yao Rösch, Florian Lobanov, Andrei P. Zensus, J. Anton High Energy Astrophysical Phenomena Astrophysics of Galaxies We present a long-term strong correlation between millimeter (mm) radio and $γ$-ray emission in the flat-spectrum radio quasar (FSRQ) PKS 1424-418. The mm$-γ$-ray connection in blazars is generally thought to originate from the relativistic jet close to the central engine. We confirm a unique long-lasting mm$-γ$-ray correlation of PKS 1424-418 by using detailed correlation analyses and statistical tests, and we find its physical meaning in the source. We employed ~8.5 yr of (sub)mm and $γ$-ray light curves observed by ALMA and Fermi-LAT, respectively. From linear and cross-correlation analyses between the light curves, we found a significant, strong mm$-γ$-ray correlation over the whole period. We did not find any notable time delay within the uncertainties for the mm$-γ$-ray correlation, which means zero lag. The mm wave spectral index values (S$_ν$ $\propto$ $ν_α$) between the band 3 and 7 flux densities indicate a time-variable opacity of the source at (sub)mm wavelengths. Interestingly, the mm wave spectral index becomes temporarily flatter (i.e., $α$ > $-$0.5) when the source flares in the $γ$-rays. We relate our results with the jet of PKS 1424-418, and we discuss the origin of the $γ$-rays and opacity of the inner (sub)parsec-scale jet regions. |
| title | PKS 1424-418: A persistent candidate source of the mm$-γ$-ray connection? |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.19737 |