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26 April 2024 |
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Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IV. H$eta$ Time Lags and Implications for Super-Eddington Accretion | | Pu Du
; Chen Hu
; Kai-Xing Lu
; Ying-Ke Huang
; Cheng Cheng
; Jie Qiu
; Yan-Rong Li
; Yang-Wei Zhang
; Xu-Liang Fan
; Jin-Ming Bai
; Wei-Hao Bian
; Ye-Fei Yuan
; Shai Kaspi
; Luis C. Ho
; Hagai Netzer
; Jian-Min Wang
; | | Date: |
8 Apr 2015 | | Abstract: | We have completed two years of photometric and spectroscopic monitoring of a
large number of active galactic nuclei (AGNs) with very high accretion rates.
In this paper, we report on the result of the second phase of the campaign,
during 2013--2014, and the measurements of five new H$eta$ time lags out of
eight monitored AGNs. All five objects were identified as super-Eddington
accreting massive black holes (SEAMBHs). The highest measured accretion rates
for the objects in this campaign are $dot{mathscr{M}}gtrsim 200$, where
$dot{mathscr{M}}= dot{M}_{ullet}/L_{
m Edd}c^{-2}$, $dot{M}_{ullet}$
is the mass accretion rates, $L_{
m Edd}$ is the Eddington luminosity and $c$
is the speed of light. We find that the H$eta$ time lags in SEAMBHs are
significantly shorter than those measured in sub-Eddington AGNs, and the
deviations increase with increasing accretion rates. Thus, the relationship
between broad-line region size ($R_{_{
m Heta}}$) and optical luminosity at
5100AA, $R_{_{
m Heta}}-L_{5100}$, requires accretion rate as an additional
parameter. We propose that much of the effect may be due to the strong
anisotropy of the emitted slim-disk radiation. Scaling $R_{_{
m Heta}}$ by
the gravitational radius of the black hole, we define a new radius-mass
parameter ($Y$) and show that it saturates at a critical accretion rate of
$dot{mathscr{M}}_c=6sim 30$, indicating a transition from thin to slim
accretion disk and a saturated luminosity of the slim disks. The parameter $Y$
is a very useful probe for understanding the various types of accretion onto
massive black holes. We briefly comment on implications to the general
population of super-Eddington AGNs in the universe and applications to
cosmology. | | Source: | arXiv, 1504.1844 | | Services: | Forum | Review | PDF | Favorites | |
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