Estimating astrophysical population properties using a multicomponent stochastic gravitational-wave background search

被引:1
作者
De Lillo, Federico [1 ]
Suresh, Jishnu [1 ]
机构
[1] Catholic Univ Louvain, Ctr Cosmol Particle Phys & Phenomenol CP3, B-1348 Louvain La Neuve, Belgium
基金
美国国家科学基金会;
关键词
PRIMORDIAL BLACK-HOLES; STAR-FORMATION; NEUTRON-STARS; COSMOLOGICAL POPULATION; MAGNETIC-FIELD; RADIATION; IMPACT; LIMITS; VIRGO; RATES;
D O I
10.1103/PhysRevD.109.103013
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The recent start of the fourth observing run of the LIGO-Virgo-KAGRA (LVK) collaboration has reopened the hunt for gravitational-wave (GW) signals, with one compact-binary-coalescence (CBC) signal expected to be observed every few days. Among the signals that could be detected for the first time there is the stochastic gravitational-wave background (SGWB) from the superposition of unresolvable GW signals that cannot be detected individually. In fact, multiple SGWBs are likely to arise given the variety of sources, making it crucial to identify the dominant components and assess their origin. However, most search methods with ground-based detectors assume the presence of one SGWB component at a time, which could lead to biased results in estimating its spectral shape if multiple SGWBs exist. Therefore, a joint estimate of the components is necessary. In this work, we adapt such an approach and analyse the data from the first three LVK observing runs, searching for a multi-component isotropic SGWB. We do not find evidence for any SGWB and establish upper limits on the dimensionless energy parameter Omega(gw)(f) at 25 Hz for five different power-law spectral indices, alpha=0,2/3,2,3,4, jointly. For the spectral indices alpha=2/3,2,4, corresponding to astrophysical SGWBs from CBCs, r-mode instabilities in young rotating neutron stars, and magnetars, we draw further astrophysical implications by constraining the ensemble parameters K-CBC,Kr-modes,K-magnetars, defined in the main text.
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页数:21
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