NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T23:58:35 PDT
Help | Comment | NED Home

For refcode 2003ApJ...593L..11Y:
Retrieve 37 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2003ApJ...593L..11Y Eddington Accretion and QSO Emission Lines at z~2 Michael Juntao Yuan and Beverley J. Wills Abstract. Broad absorption line (BAL) QSOs have been suggested to be youthful superaccretors based on their powerful radiatively driven absorbing outflows and often reddened continua. To test this hypothesis, we observed near-IR spectra of the H{beta} region for 11 bright BAL QSOs at redshift z~2. We measured these and literature spectra for six BAL QSOs and 13 radio-loud and seven radio-quiet non-BAL QSOs. Using the luminosity and H{beta} broad line width to derive black hole mass and accretion rate, we find that both BAL and non-BAL QSOs at z~2 tend to have higher L/L_Edd_ than those at low z -- probably a result of selecting the brightest QSOs. However, we find that the high-z QSOs, in particular the BAL QSOs, have extremely strong Fe II and very weak [O III], extending the inverse relationship found for low-z QSOs. This suggests that, even while radiating near L_Edd_, the BAL QSOs have a more plentiful fuel supply than non-BAL QSOs. Comparison with low-z QSOs shows for the first time that the inverse Fe II -- [O III] relationship is indeed related to L/L_Edd_, rather than black hole mass. Keywords: Accretion, Accretion Disks, Black Hole Physics, Galaxies: Active, Galaxies: Evolution, Galaxies: Quasars: Emission Lines, Galaxies: Quasars: General
Retrieve 37 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home