Imprints of supermassive black hole evolution on the spectral and spatial anisotropy of nano-hertz stochastic gravitational-wave background

被引：8

作者：

Sah, Mohit Raj ^{[1
]}

Mukherjee, Suvodip ^{[1
]}

Saeedzadeh, Vida ^{[2
]}

Babul, Arif ^{[2
,3
]}

Tremmel, Michael ^{[4
]}

Quinn, Thomas R. ^{[5
]}

机构：

[1] Tata Inst Fundamental Res, Dept Astron & Astrophys, Mumbai 400005, India

[2] Univ Victoria, Dept Phys & Astron, 3800 Finnerty Rd, Victoria, BC V8P 1A1, Canada

[3] Indian Inst Sci, Infosys Visiting Chair Prof, Bangalore 560012, India

[4] Univ Coll Cork, Sch Phys, Coll Rd, Cork T12K8AF, Ireland

[5] Univ Washington, Astron Dept, Box 351580, Seattle, WA 98195 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 533卷 / 02期

关键词：

gravitational waves; cosmology: miscellaneous; black hole mergers; CHALLENGE LIGHTCONE SIMULATION; COSMOLOGICAL SIMULATIONS; ECCENTRICITY EVOLUTION; GALAXY FORMATION; BINARY-SYSTEMS; PARSEC PROBLEM; M-BH; MASS; ARRAY; HALO;

D O I：

10.1093/mnras/stae1930

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The formation and evolution of supermassive black holes (SMBHs) remains an open question in the field of modern cosmology. The detection of nanohertz (n-Hz) gravitational waves via pulsar timing arrays (PTAs) in the form of individual events and the stochastic gravitational wave background (SGWB) offers a promising avenue for studying SMBH evolution across cosmic time, with SGWB signal being the immediately detectable signal with the currently accessible telescope sensitivities. By connecting the galaxy properties in the large scale (Gpc scale) cosmological simulation such as MICECAT with the small scale ($\sim$Mpc scale) galaxy simulations from ROMULUS, we show that different scenarios of galaxy-SMBH evolution with redshift leads to a frequency-dependent spatial anisotropy in the SGWB signal. The presence of slow evolution of the SMBHs in the Universe leads to a pronounced blue anisotropic spectrum of the SGWB. In contrast, if SMBHs grow faster in the Universe in lighter galaxies, the frequency-dependent spatial anisotropy exhibits a more flattened anisotropic spectrum. This additional aspect of the SGWB signal on top of the monopole SGWB signal, can give insight on how the SMBHs form in the high-redshift Universe and its interplay with the galaxy formation from future measurements.

引用

页码：1568 / 1582

页数：15

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