SIMBAD references

2019ApJ...879..117K - Astrophys. J., 879, 117-117 (2019/July-2)

High star formation rates of low Eddington ratio quasars at z >= 6.

KIM Y. and IM M.

Abstract (from CDS):

Recent simulation studies suggest that the supermassive black hole (SMBH) growth in the early universe may precede prolonged intense star formation within its host galaxy, rather than quasars appearing after the obscured dusty star formation phase. If so, high-redshift quasars with low Eddington ratios (λEdd) would be found in actively star-forming hosts with a star formation rate (SFR) of >100 M yr–1. We present the submillimeter observations of IMS J2204+0112, a faint quasar with a quasar bolometric luminosity of Lbol=4.2×1012L and a low λEdd of only 0.1 at z ∼ 6, carried out with the Atacama Large Millimeter/submillimeter Array (ALMA). From its submillimeter fluxes, we measure the rest-frame far-infrared (FIR) luminosity of LFIR=(3-4)×1012L. Interestingly, the derived host galaxy's SFR is ∼500-700M yr–1, an order of magnitude higher than those of the Lbol-matched z >= 6 quasars with high λEdd. Similar FIR excesses are also found for five z >= 6 low-λEdd quasars (λEdd< 0.2) in the literature. We show that the overall SFR, MBH, and λEdd distributions of these and other submillimeter-detected quasars at z >= 6 can be explained with the evolutionary track of high-redshift quasars in a simulation study, where low λEdd and high SFR quasars are expected at the end of the SMBH growth. This suggests that the nuclear activities of the low λEdd, high LFIR quasars are on the brink of being turned off, while their host galaxies continue to form the bulk of their stars at SFR >100 M yr–1.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: active - galaxies: high-redshift - galaxies: starburst - quasars: general - quasars: individual: IMS J2204+0112 - quasars: supermassive black holes

Simbad objects: 52

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