Radio AGN jet alignment: Radio and Optical Position Angle of Radio Galaxies
arxiv(2024)
摘要
It is well established that AGNs play an important role in the evolution of
galaxies. These AGNs can be linked to the accretion processes onto massive
black holes and past merger events in their host galaxies, which may lead to
different alignments of the jets with respect to the host galaxies. This paper
presents a study of the PA differences between radio and optical images of
radio AGNs based on the LoTSS DR2, the FIRST, the DESI Legacy Imaging Surveys
and the SDSS. We assessed PA measurement biases in the data and classified the
radio AGNs based on the radio luminosity and infrared colour from the WISE.
This resulted in the largest yet published sample of 3682 radio AGNs with
reliable radio and optical PA measurements. The PA difference (dPA)
distributions for the radio AGN sample show a prominent minor-axis alignment
tendency. Based on some simple assumptions, we simulated the projection effect
to estimate the intrinsic jet-galaxy alignment. The observed dPA distribution
can be well described by a two-component jet-alignment model in which one
component is more aligned with the minor axis of the host galaxy than the
other. The fitting results indicate that the jet alignment is dependent on
radio luminosity and the shape of the host galaxies, with the jets being more
likely to be aligned with the minor axis of the galaxy for lower radio
luminosity and for optically more elongated radio AGNs. The minor-axis
alignment of the entire sample may suggest a coherent accretion model present
in most AGN host galaxies, while a considerable number of luminous radio-AGN
with massive host galaxies might have undergone an accretion according to the
chaotic model or past merger events.
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