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Super-Eddington Accretion in the WISE-selected Extremely Luminous Infrared Galaxy W2246-0526

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journal contribution
posted on 2019-09-24, 13:53 authored by C-W Tsai, PRM Eisenhardt, HD Jun, J Wu, RJ Assef, AW Blain, T Diaz-Santos, SF Jones, D Stern, EL Wright, SCC Yeh
We use optical and near-infrared spectroscopy to observe rest-UV emission lines and estimate the black hole mass of WISEA J224607.56−052634.9 (W2246−0526) at z = 4.601, the most luminous hot, dust-obscured galaxy yet discovered by WISE. From the broad component of the Mg ii 2799 Å emission line, we measure a black hole mass of log(M BH/M ☉) = 9.6 ± 0.4. The broad C iv 1549 Å line is asymmetric and significantly blueshifted. The derived M BH from the blueshift-corrected broad C iv line width agrees with the Mg ii result. From direct measurement using a well-sampled SED, the bolometric luminosity is 3.6 × 1014 L ☉. The corresponding Eddington ratio for W2246−0526 is λ Edd = L AGN/L Edd = 2.8. This high Eddington ratio may reach the level where the luminosity is saturating due to photon trapping in the accretion flow and may be insensitive to the mass accretion rate. In this case, the M BH growth rate in W2246−0526 would exceed the apparent accretion rate derived from the observed luminosity.

Funding

The authors gratefully acknowledge the anonymous referee for valuable comments and suggestions that improved the paper. C.-W.T. would like to thank Jian-Min Wang for the valuable discussions. This material is based upon work supported by the National Aeronautics and Space Administration under proposal 13-ADAP13-0092 issued through the Astrophysics Data Analysis Program. H.D.J. is supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1A6A3A04005158). J.W. is supported by the National Key Program for Science and Technology Research and Development of China (grant 2016YFA0400702) and project 11673029 supported by NSFC. R.J.A. was supported by FONDECYT grant 1151408. T.D.-S. acknowledges support from ALMA-CONICYT project 31130005 and FONDECYT regular project 1151239. This publication makes use of data obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among Caltech, the University of California, and NASA. The Keck Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory, California Institute of Technology, funded by the National Aeronautics and Space Administration. This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Facilities: Keck:I (OSIRIS - , LRIS) - , Herschel Space Te

History

Citation

Astrophysical Journal, 2018, 868 (1)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Astrophysical Journal

Publisher

American Astronomical Society, IOP Publishing

issn

0004-637X

eissn

1538-4357

Copyright date

2018

Available date

2019-09-24

Publisher version

https://iopscience.iop.org/article/10.3847/1538-4357/aae698

Language

en