scholarly journals The Effect of Orbital Eccentricity on Gravitational Wave Background Radiation from Supermassive Black Hole Binaries

2007 ◽  
Vol 117 (2) ◽  
pp. 241-256 ◽  
Author(s):  
M. Enoki ◽  
M. Nagashima
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Background Radiation ◽  
Orbital Eccentricity ◽  
Black Hole Binaries ◽  
Supermassive Black Hole ◽  
Gravitational Wave Background

scholarly journals The local nanohertz gravitational-wave landscape from supermassive black hole binaries

2017 ◽  
Vol 1 (12) ◽  
pp. 886-892 ◽  
Author(s):  
Chiara M. F. Mingarelli ◽  
T. Joseph W. Lazio ◽  
Alberto Sesana ◽  
Jenny E. Greene ◽  
Justin A. Ellis ◽  
...  
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Black Hole Binaries ◽  
Supermassive Black Hole

scholarly journals A Quasar-based Supermassive Black Hole Binary Population Model: Implications for the Gravitational Wave Background

2022 ◽  
Vol 924 (2) ◽  
pp. 93
Author(s):  
J. Andrew Casey-Clyde ◽  
Chiara M. F. Mingarelli ◽  
Jenny E. Greene ◽  
Kris Pardo ◽  
Morgan Nañez ◽  
...  
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Population Model ◽  
Galaxy Mergers ◽  
Number Density ◽  
Data Set ◽  
Underlying Distribution ◽  
Supermassive Black Hole ◽  
Gravitational Wave Background ◽  
Local Number

Abstract The nanohertz gravitational wave background (GWB) is believed to be dominated by GW emission from supermassive black hole binaries (SMBHBs). Observations of several dual-active galactic nuclei (AGN) strongly suggest a link between AGN and SMBHBs, given that these dual-AGN systems will eventually form bound binary pairs. Here we develop an exploratory SMBHB population model based on empirically constrained quasar populations, allowing us to decompose the GWB amplitude into an underlying distribution of SMBH masses, SMBHB number density, and volume enclosing the GWB. Our approach also allows us to self-consistently predict the number of local SMBHB systems from the GWB amplitude. Interestingly, we find the local number density of SMBHBs implied by the common-process signal in the NANOGrav 12.5-yr data set to be roughly five times larger than previously predicted by other models. We also find that at most ∼25% of SMBHBs can be associated with quasars. Furthermore, our quasar-based approach predicts ≳95% of the GWB signal comes from z ≲ 2.5, and that SMBHBs contributing to the GWB have masses ≳108 M ⊙. We also explore how different empirical galaxy–black hole scaling relations affect the local number density of GW sources, and find that relations predicting more massive black holes decrease the local number density of SMBHBs. Overall, our results point to the important role that a measurement of the GWB will play in directly constraining the cosmic population of SMBHBs, as well as their connections to quasars and galaxy mergers.

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