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New MeerKAT observations reveal complex kinematics of HI absorption in a rejuvenated radio galaxy, suggesting active cycles.
We present new high-spectral-resolution MeerKAT observations of H\, I 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 (FWHM 38 ± 7 kms−1) redshifted to 96 ± 50 kms−1, a deep-narrow detection (FWHM 19 ± 6 kms−1) which is redshifted to 160 ± 40 kms−1 and a shallow component (FWHM 22 ± 6 kms−1) redshifted to 240 ± 40 kms−1. One of the three components exceeds the typical rotational velocity of 100 kms−1, suggesting complex kinematics of the inflowing gas. These H\, I observations support the correlation between the occurrence of H\, I absorption and the rejuvenation of radio activity.
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Mtshweni et al. (2025) studied this question.
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