Supermassive binary black hole evolution can be traced by a small SKA pulsar timing array
Supermassive binary black hole evolution can be traced by a small SKA pulsar timing array
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小型SKA脉冲星计时阵列可以追踪超大质量双黑洞演化
DOI:
10.1103/physrevd.102.023014
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发表时间:
2020-05
期刊:
影响因子:
--
通讯作者:
Tsai Chao-Wei
中科院分区:
文献类型:
--
作者:
Feng Yi;Li Di;Zheng Zheng;Tsai Chao-Wei
Supermassive black holes are commonly found in the centers of galaxies and evolve with their hosts. Supermassive binary black holes (SMBBH) are thus expected to exist in close galaxy pairs; however, none has been unequivocally detected. The square kilometer array (SKA) is a multipurpose radio telescope with a collecting area approaching ${10}^{6}$ square meters, with great potential for detecting nanohertz gravitational waves (GWs). In this paper, we quantify the GW detectability by SKA for a realistic SMBBH population using a pulsar timing array (PTA) technique, and we quantify its impact on revealing SMBBH evolution with redshift for the first time. With only $\ensuremath{\sim}20$ pulsars, a much smaller requirement than in previous work, the SKAPTA is expected to obtain detection within about 5 years of operation and to achieve a detection rate of more than 100 SMBBHs/yr after about 10 years. Although beyond the scope of this paper, we must acknowledge that the presence of persistent red noise will reduce the number of expected detections here. It is thus imperative to understand and mitigate red noise in the PTA data. The GW signatures from a few well-known SMBBH candidates, such as OJ 287, 3C 66B, NGC 5548, and Ark 120, will be detected given the currently best-known parameters of each system. Within 30 years of operation, about 60 individual SMBBH detections with $zl0.05$ and more than ${10}^{4}$ with $zl1$ are expected. The detection rate drops precipitately beyond $z=1$. The substantial number of expected detections and their discernible evolution with redshift by the SKAPTA will make SKA a significant tool for studying SMBBHs.
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DOI:
10.1086/301330
发表时间:
2000-04
期刊:
The Astronomical Journal
影响因子:
--
作者:
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通讯作者:
T. Jarrett;T. Chester;R. Cutri;S. Schneider;M. Skrutskie;J. Huchra
DOI:
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发表时间:
2014
期刊:
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影响因子:
--
作者:
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通讯作者:
F. Acernese;M. Agathos;K. Agatsuma;D. Aisa;N. Allemandou;A. Allocca;J. Amarni;P. Astone;G. Ba
影响因子:
3.5
作者:
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通讯作者:
R. Manchester
DOI:
10.1088/0004-637x/756/2/175
发表时间:
2012-04
期刊:
The Astrophysical Journal
影响因子:
--
作者:
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通讯作者:
J. Ellis;X. Siemens;J. Creighton
影响因子:
3.5
作者:
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通讯作者:
S. Burke-Spolaor