Missing Link: Bayesian detection and measurement of intermediate-mass black-hole binaries

被引：80

作者：

Graff, Philip B. ^{[1
,2
,3
]}

Buonanno, Alessandra ^{[1
,4
]}

Sathyaprakash, B. S. ^{[4
,5
]}

机构：

[1] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[2] NASA, Goddard Space Flight Ctr, Gravitat Astrophys Lab, Greenbelt, MD 20771 USA

[3] Univ Maryland, Joint Space Sci Inst, College Pk, MD 20742 USA

[4] Max Planck Inst Gravitat Phys, Albert Einstein Inst, D-14476 Potsdam, Germany

[5] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales

来源：

PHYSICAL REVIEW D | 2015年 / 92卷 / 02期

基金：

美国国家科学基金会;

关键词：

GRAVITATIONAL-WAVES; EFFICIENT; EVOLUTION; CHOICE;

D O I：

10.1103/PhysRevD.92.022002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We perform Bayesian analysis of gravitational-wave signals from nonspinning, intermediate-mass black-hole binaries (IMBHBs) with observed total mass, M-obs, from 50M(circle dot) to 500M(circle dot) and mass ratio 1-4 using advanced LIGO and Virgo detectors. We employ inspiral-merger-ringdown waveform models based on the effective-one-body formalism and include subleading modes of radiation beyond the leading (2,2) mode. The presence of subleading modes increases signal power for inclined binaries and allows for improved accuracy and precision in measurements of the masses as well as breaking of degeneracies in distance, orientation and polarization. For low total masses, M-obs less than or similar to 50M(circle dot), for which the inspiral signal dominates, the observed chirp mass M-obs = M-obs eta(3/5) (eta being the symmetric mass ratio) is better measured. In contrast, as increasing power comes from merger and ringdown, we find that the total mass Mobs has better relative precision than M-obs. Indeed, at high M-obs (>= 300M(circle dot)), the signal resembles a burst and the measurement thus extracts the dominant frequency of the signal that depends on Mobs. Depending on the binary's inclination, at signal-to-noise ratio (SNR) of 12, uncertainties in Mobs can be as large as similar to 20-25% while uncertainties in Mobs are similar to 50-60% in binaries with unequal masses (those numbers become similar to 17% vs. similar to 22% in more symmetric mass-ratio binaries). Although large, those uncertainties in M-obs will establish the existence of IMBHs. We find that effective-one-body waveforms with subleading modes are essential to confirm a signal's presence in the data, with calculated Bayesian evidences yielding a false alarm probability below 10(-5) for SNR greater than or similar to 9 in Gaussian noise. Our results show that gravitational-wave observations can offer a unique tool to observe and understand the formation, evolution and demographics of IMBHs, which are difficult to observe in the electromagnetic window.

引用

页数：19

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