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- W4386435797 abstract "We present the first systematic search for UV signatures from radio source-driven AGN feedback in Compact Steep Spectrum (CSS) radio galaxies. Owing to their characteristic sub-galactic jets (1-20 kpc projected linear sizes), CSS hosts are excellent laboratories for probing galaxy scale feedback via jet-triggered star formation. The sample consists of 7 powerful CSS galaxies, and 2 galaxies host to radio sources >20 kpc as control, at low to intermediate redshifts (z<0.6). Our new HST images show extended UV continuum emission in 6/7 CSS galaxies; with 5 CSS hosts exhibiting UV knots co-spatial and aligned along the radio-jet axis. Young (<10 Myr), massive (>5 M$_odot$) stellar populations are likely to be the dominant source of the blue excess emission in radio galaxies at these redshifts. Hence, the radio-aligned UV regions could be attributed to jet-induced starbursts. Lower near-UV SFRs compared to other indicators suggests low scattered AGN light contribution to the observed UV. Dust attenuation of UV emission appears unlikely from high internal extinction correction estimates in most sources. Comparison with evolutionary synthesis models shows that our observations are consistent with recent (~1-8 Myr old) star forming activity likely triggered by current or an earlier episode of radio emission, or by a confined radio source that has frustrated growth due to a dense environment. While follow-up spectroscopic and polarized light observations are needed to constrain the activity-related components in the observed UV, the detection of jet-induced star formation is a confirmation of an important prediction of the jet feedback paradigm." @default.
- W4386435797 created "2023-09-05" @default.
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- W4386435797 date "2023-08-31" @default.
- W4386435797 modified "2023-10-01" @default.
- W4386435797 title "Optical- & UV-Continuum Morphologies of Compact Radio Source Hosts" @default.
- W4386435797 doi "https://doi.org/10.48550/arxiv.2309.00110" @default.
- W4386435797 hasPublicationYear "2023" @default.
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