2025ApJ...987...66F -
Astrophys. J., 987, 66 (2025/July-1)
J1406+0102: A Dust-obscured Galaxy Hiding a Super-Eddington Accretion System with Bright Radio Emission.
FUKUCHI H., ICHIKAWA K., AKIYAMA M., KIMURA S.S., TOBA Y., INAYOSHI K., NOBORIGUCHI A., KAWAGUCHI T., CHEN X. and FITRIANA I.K.
Abstract (from CDS):
Recent high-z quasar observations strongly indicate that super-Eddington accretion is a crucial phase to describe the presence of supermassive black holes (SMBHs) with MBH ≳ 109M⊙ at z ≳ 7. Motivated by theoretical predictions that the super-Eddington phase efficiently produces outflows and bright jets in radio bands, we identify a super-Eddington radio-loud dust-obscured galaxy (DOG) J1406+0102 at z = 0.2367. This source is discovered by cross-matching the infrared-bright DOGs of A. Noboriguchi et al. with the Very Large Array/Far-Infrared and Submillimetre Telescope 1.4 GHz radio survey data and the Sloan Digital Sky Survey optical spectral catalog. J1406+0102 shows broad components in the Balmer lines, and by assuming that those lines are from the broad-line region, they give black hole (BH) mass estimations of $\mathrm{log}\,({M}_{{\rm{BH}}}/{M}_{\odot })=7.30\pm 0.25$. Combined with an active galactic nucleus (AGN) luminosity of $\mathrm{log}({L}_{\mathrm{bol},[{\rm{O}}\,\mathrm{III}]}/\mathrm{erg}\,{{\rm{s}}}^{-1})=45.91\pm 0.38$ estimated from the intrinsic [O III] luminosity, this implies a super-Eddington accretion rate of λEdd ≃ 3. We show that (1) J1406+0102 shows strong AGN feedback, with the [O III] outflow velocity exceeding the escape velocity of the host galaxy halo and a kinetic efficiency of ≈8%, sufficient to quench the host galaxy; (2) its expected growth trajectory places it on an overmassive BH track; and (3) if representative of radio-loud DOGs, such sources can contribute significantly to the high-energy (≳100 TeV) cosmic neutrino background.
Abstract Copyright:
© 2025. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
Quasars - Radio loud quasars - Supermassive black holes - Active galactic nuclei - Neutrino astronomy
Simbad objects:
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