http://arxiv.org/abs/2301.07929
We present polarization-sensitive images from the Karl G. Jansky Very Large Array (VLA) at 5~GHz of 11 radio-quiet PG quasars. Based on the radio morphology, spectral index and polarization properties from the VLA study, coupled with the findings of previous 685~MHz uGMRT data, we find evidence for bent and low-powered jets on milli or sub-arcsec and arcsec scales in 8 sources. We cannot determine the origin of radio emission (between jet/AGN wind/starburst wind) with the current data in the remaining 3 sources. Of the 11 sources, linear polarization is detected in four of them. The fractional polarization in them ranges between 2\% to 25\%. In PG~0050+124 and PG~1229+204, the inferred B-field direction is parallel to the local kpc-scale jet direction. Very Long Baseline Array (VLBA) data on PG~0050+124 indicates that the jet changes its direction from pc- to kpc-scales in this source. For PG~0923+129, the relationship between its B-field direction and radio outflow direction remains unclear. PG~0934+013 exhibits transverse inferred B-fields at the base of its kpc-scale jet. While there appears to be no evidence in the literature for global signatures of `AGN feedback’ in this sample such as reduced molecular gas content or star-formation, scenarios like localised AGN feedback or a preliminary phase of AGN feedback, cannot be ruled out. Differences in the time-scales of gas outflows and AGN activity could also play a role. In addition, the galactic merger scenario could influence the overall interpretation of AGN feedback in these sources, given that the host galaxies in a large fraction of them show signatures of ongoing galactic mergers.
S. S., P. Kharb, L. Ho, et. al.
Fri, 20 Jan 23
10/72
Comments: 19 pages, 7 figures; submitted to ApJ
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