Planck revealed bulk motion of Centaurus A lobes
F. De Paolis, V.G. Gurzadyan, A.A. Nucita, G. Ingrosso, A.L. Kashin,, H.G. Khachatryan, S. Mirzoyan, G. Yegorian, Ph. Jetzer, A. Qadir, D. Vetrugno
TL;DR
This paper uses Planck data to detect a temperature asymmetry in Centaurus A's lobes, indicating bulk motion and differential dynamics of the lobes relative to the galaxy's center.
Contribution
It provides the first evidence of bulk motion in Centaurus A's lobes through temperature asymmetry analysis at multiple GHz frequencies.
Findings
Temperature asymmetry extends up to 5 degrees from the galaxy center.
Asymmetry diminishes towards the outer lobes.
Indicates line-of-sight bulk motion of the lobes.
Abstract
Planck data towards the active galaxy Centaurus A are analyzed in the 70, 100 and 143 GHz bands. We find a temperature asymmetry of the northern radio lobe with respect to the southern one that clearly extends at least up to 5 degrees from the Cen A center and diminishes towards the outer regions of the lobes. That transparent parameter - the temperature asymmetry - thus has to carry a principal information, i.e. indication on the line-of-sight bulk motion of the lobes, while the increase of that asymmetry at smaller radii reveals the differential dynamics of the lobes as expected at ejections from the center.
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