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The advent of next generation radio telescope facilities, such as the Square Kilometer Array (SKA), will usher in an era where a Pulsar Timing Array (PTA) based search for gravitational waves (GWs) will be able to use hundreds of well timed…

Instrumentation and Methods for Astrophysics · Physics 2017-04-19 Yan Wang , Soumya D. Mohanty

Supermassive binary black holes (SMBBHs) in galactic centers may radiate gravitational wave (GW) in the nano-Hertz frequency band, which are expected to be detected by pulsar timing arrays (PTAs) in the near future. GW signals from…

Astrophysics of Galaxies · Physics 2020-02-12 Changshuo Yan , Wen Zhao , Youjun Lu

Ultra-low-frequency gravitational waves (GWs) generated by individual inspiraling supermassive black hole binaries (SMBHBs) at the centers of galaxies may be detected by pulsar timing arrays (PTAs) in the future. These GW signals, which…

Cosmology and Nongalactic Astrophysics · Physics 2025-05-30 Ling-Feng Wang , Yue Shao , Si-Ren Xiao , Jing-Fei Zhang , Xin Zhang

Pulsar timing arrays (PTAs) are searching for gravitational waves from supermassive black hole binaries (SMBHBs). Here we show how future PTAs could use a detection of gravitational waves from individually resolved SMBHB sources to produce…

Cosmology and Nongalactic Astrophysics · Physics 2022-10-13 Casey McGrath , Daniel J. D'Orazio , Jolien Creighton

The observation of massive black hole binaries (MBHBs) with Pulsar Timing Arrays (PTAs) is one of the goals of gravitational wave astronomy in the coming years. Massive (>10^8 solar masses) and low-redshift (< 1.5) sources are expected to…

Cosmology and Nongalactic Astrophysics · Physics 2010-05-19 Alberto Sesana , Alberto Vecchio

Pulsar timing arrays (PTAs) are Galactic-scale gravitational wave (GW) detectors consisting of precisely-timed pulsars distributed across the sky. Within the decade, PTAs are expected to detect the nanohertz GWs emitted by close-separation…

High Energy Astrophysical Phenomena · Physics 2023-03-15 Tingting Liu , Tyler Cohen , Casey McGrath , Paul Demorest , Sarah Vigeland

Supermassive black hole binaries (SMBHBs) are expected to emit continuous gravitational waves in the pulsar timing array (PTA) frequency band ($10^{-9}$--$10^{-7}$ Hz). The development of data analysis techniques aimed at efficient…

Instrumentation and Methods for Astrophysics · Physics 2015-06-04 Justin Ellis , Xavier Siemens , Jolien Creighton

Pulsar timing arrays (PTAs) are anticipated to detect continuous gravitational waves (GWs) from individual supermassive black hole binaries (SMBHBs) in the near future. To identify the host galaxy of a GW source, PTAs require significantly…

General Relativity and Quantum Cosmology · Physics 2026-01-12 Ryo Kato , Keitaro Takahashi

Galaxy observations suggest that mergers of supermassive black hole binaries (SMBHBs) are rare events, with rates of order one per decade across the observable Universe. We present a framework to search for merging SMBHBs in pulsar timing…

High Energy Astrophysical Phenomena · Physics 2026-04-17 Sharon Mary Tomson , Boris Goncharov , Rutger van Haasteren

By monitoring the times of arrival of radio pulses from millisecond pulsars, Pulsar Timing Arrays (PTAs) serve as unique gravitational wave (GW) laboratories in the nanohertz band. To date, the primary astrophysical sources of GWs targeted…

High Energy Astrophysical Phenomena · Physics 2026-04-24 Hippolyte Quelquejay Leclere

By regularly monitoring the most stable millisecond pulsars over many years, pulsar timing arrays (PTAs) are positioned to detect and study correlations in the timing behaviour of those pulsars. Gravitational waves (GWs) from supermassive…

We present an analytic model to describe the supermassive black hole binary (SMBHB) merger rate in the Universe with astrophysical observables: galaxy stellar mass function, pair fraction, merger timescale and black hole - host galaxy…

Astrophysics of Galaxies · Physics 2019-07-25 Siyuan Chen , Alberto Sesana , Christopher J. Conselice

Gravitational wave signal from the inspiral of stellar-mass binary black hole can be used as standard sirens to perform cosmological inference. This inspiral covers a wide range of frequency bands, from the millihertz band to the…

Cosmology and Nongalactic Astrophysics · Physics 2022-02-01 Liang-Gui Zhu , Ling-Hua Xie , Yi-Ming Hu , Shuai Liu , En-Kun Li , Nicola R. Napolitano , Bai-Tian Tang , Jian-dong Zhang , Jianwei Mei

We discuss the interpretation of the detected signal by Pulsar Timing Array (PTA) observations as a gravitational wave background (GWB) of cosmological origin. We combine NANOGrav 15-years and EPTA-DR2new data sets and confront them against…

Cosmology and Nongalactic Astrophysics · Physics 2024-04-29 Daniel G. Figueroa , Mauro Pieroni , Angelo Ricciardone , Peera Simakachorn

We demonstrate how pulsar timing arrays (PTAs) can, in principle, yield a purely gravitational wave (GW) measurement of the luminosity distance and comoving distance to a supermassive black hole binary source, hence providing an estimate of…

Cosmology and Nongalactic Astrophysics · Physics 2021-09-15 Daniel J. D'Orazio , Abraham Loeb

This paper presents a technique to search for supermassive black hole binaries (MBHBs) in the Sloan Digital Sky Survey (SDSS). The search is based on the peculiar properties of merging galaxies that are found in a mock galaxy catalog from…

Cosmology and Nongalactic Astrophysics · Physics 2014-03-06 Pablo A. Rosado , Alberto Sesana

Pulsar Timing Arrays (PTAs) are expected to be able to detect gravitational waves (GWs) from individual supermassive black hole binaries in the near future. In order to identify the host galaxy of a gravitational wave source, the angular…

General Relativity and Quantum Cosmology · Physics 2023-12-20 Ryo Kato , Keitaro Takahashi

We present a comprehensive framework for predicting the detection prospects of supermassive black hole binaries (SMBHBs) by future gravitational wave (GW) observatories, examining both space-borne detectors (LISA, Taiji, TianQin) and…

High Energy Astrophysical Phenomena · Physics 2026-02-09 Katsunori Kusakabe , Yoshiyuki Inoue , Daisuke Toyouchi , Keitaro Takahashi

Pulsar timing arrays (PTAs) are on the verge of detecting low-frequency gravitational waves (GWs) from supermassive black hole binaries (SMBHBs). With continued observations of a large sample of millisecond pulsars, PTAs will reach this…

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