HI gas in the rejuvenated radio galaxy PKS 2014-55
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| Format: | Preprint |
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2025
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| author | Mtshweni, Leon Thorat, Kshitij Deane, Roger P. Frank, Bradley S. Maccagni, Filippo M. J'ozsa, Gyula I. Cotton, William D. Giri, Gourab White, Sarah V. Atemkeng, Marcellin Bester, Hertzog L. Fanaroff, Bernie L. Heywood, Ian Lawrie, Graham Manamela, Thato E. Magolego, Isaac Mauch, Tom Oozeer, Nadeem Smirnov, Oleg Kupa, Masacheba S. |
| author_facet | Mtshweni, Leon Thorat, Kshitij Deane, Roger P. Frank, Bradley S. Maccagni, Filippo M. J'ozsa, Gyula I. Cotton, William D. Giri, Gourab White, Sarah V. Atemkeng, Marcellin Bester, Hertzog L. Fanaroff, Bernie L. Heywood, Ian Lawrie, Graham Manamela, Thato E. Magolego, Isaac Mauch, Tom Oozeer, Nadeem Smirnov, Oleg Kupa, Masacheba S. |
| contents | We present new high-spectral-resolution MeerKAT observations of $\mathrm{HI}$ absorption against the central region of the restarted, giant, X-shaped radio galaxy PKS2014-55, which exhibits morphological evidence of three distinct cycles of activity. We report a wide component $(\mathrm{FWHM}=38 \pm 7~\mathrm{kms^{-1}})$ redshifted to $96 \pm 50~\mathrm{kms^{-1}}$, a deep narrow detection $(\mathrm{FWHM}=19 \pm 6~\mathrm{kms^{-1}})$ redshifted to $160 \pm 40~\mathrm{kms^{-1}}$, and a shallow component $(\mathrm{FWHM}=22 \pm 6~\mathrm{kms^{-1}})$ redshifted to $240 \pm 40~\mathrm{kms^{-1}}$. One of the three components exceeds the typical rotational velocity of $100~\mathrm{kms^{-1}}$, suggesting complex kinematics of the inflowing gas. These $\mathrm{HI}$ observations support the correlation between the occurrence of $\mathrm{HI}$ absorption and the rejuvenation of radio activity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_20276 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | HI gas in the rejuvenated radio galaxy PKS 2014-55 Mtshweni, Leon Thorat, Kshitij Deane, Roger P. Frank, Bradley S. Maccagni, Filippo M. J'ozsa, Gyula I. Cotton, William D. Giri, Gourab White, Sarah V. Atemkeng, Marcellin Bester, Hertzog L. Fanaroff, Bernie L. Heywood, Ian Lawrie, Graham Manamela, Thato E. Magolego, Isaac Mauch, Tom Oozeer, Nadeem Smirnov, Oleg Kupa, Masacheba S. Astrophysics of Galaxies We present new high-spectral-resolution MeerKAT observations of $\mathrm{HI}$ absorption against the central region of the restarted, giant, X-shaped radio galaxy PKS2014-55, which exhibits morphological evidence of three distinct cycles of activity. We report a wide component $(\mathrm{FWHM}=38 \pm 7~\mathrm{kms^{-1}})$ redshifted to $96 \pm 50~\mathrm{kms^{-1}}$, a deep narrow detection $(\mathrm{FWHM}=19 \pm 6~\mathrm{kms^{-1}})$ redshifted to $160 \pm 40~\mathrm{kms^{-1}}$, and a shallow component $(\mathrm{FWHM}=22 \pm 6~\mathrm{kms^{-1}})$ redshifted to $240 \pm 40~\mathrm{kms^{-1}}$. One of the three components exceeds the typical rotational velocity of $100~\mathrm{kms^{-1}}$, suggesting complex kinematics of the inflowing gas. These $\mathrm{HI}$ observations support the correlation between the occurrence of $\mathrm{HI}$ absorption and the rejuvenation of radio activity. |
| title | HI gas in the rejuvenated radio galaxy PKS 2014-55 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2508.20276 |