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- W4313360520 startingPage "95" @default.
- W4313360520 abstract "It is commonly accepted that radio-loud active galactic nuclei are hosted exclusively by giant elliptical galaxies. We analyze high-resolution optical Hubble Space Telescope images of a sample of radio galaxies with extended double-lobed structures associated with disk-like optical counterparts. After systematically evaluating the probability of chance alignment between the radio lobes and the optical counterparts, we obtain a sample of 18 objects likely to have genuine associations. The host galaxies have unambiguous late-type morphologies, including spiral arms, large-scale dust lanes among the edge-on systems, and exceptionally weak bulges, as judged by the low global concentrations, small global S'{e}rsic indices, and low bulge-to-total light ratios (median $B/T = 0.13$). With a median S'{e}rsic index of 1.4 and low effective surface brightnesses, the bulges are consistent with being pseudo bulges. The majority of the hosts have unusually large stellar masses (median $M_* = 1.3times 10^{11}, M_odot$) and red optical colors (median $g-r = 0.69,$mag), consistent with massive, quiescent galaxies on the red sequence. We suggest that black hole mass (stellar mass) plays a fundamental role in launching large-scale radio jets, and that the rarity of extended radio lobes in late-type galaxies is the consequence of the steep stellar mass function at the high-mass end. The disk radio galaxies have mostly Fanaroff-Riley type II morphologies yet lower radio power than sources of a similar type traditionally hosted by ellipticals. The radio jets show no preferential alignment with the minor axis of the galactic bulge or disk, apart from a possible mild tendency for alignment among the most disk-dominated systems." @default.
- W4313360520 created "2023-01-06" @default.
- W4313360520 creator A5054184482 @default.
- W4313360520 creator A5068129399 @default.
- W4313360520 creator A5086865322 @default.
- W4313360520 date "2022-12-01" @default.
- W4313360520 modified "2023-10-18" @default.
- W4313360520 title "An Elusive Population of Massive Disk Galaxies Hosting Double-lobed Radio-loud Active Galactic Nuclei" @default.
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