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Publication . Article . Other literature type . Preprint . 2022

Observing GW190521-like binary black holes and their environment with LISA

Laura Sberna; Stanislav Babak; Sylvain Marsat; Andrea Caputo; Giulia Cusin; Alexandre Toubiana; Enrico Barausse; +4 Authors
Open Access
English
Abstract

Binaries of relatively massive black holes like GW190521 have been proposed to form in dense gas environments, such as the disks of Active Galactic Nuclei (AGNs), and they might be associated with transient electromagnetic counterparts. The interactions of this putative environment with the binary could leave a significant imprint at the low gravitational wave frequencies observable with the Laser Interferometer Space Antenna (LISA). We show that LISA will be able to detect up to ten GW190521-like black hole binaries, with sky position errors $\lesssim1$ deg$^2$. Moreover, it will measure directly various effects due to the orbital motion around the supermassive black hole at the center of the AGN, especially the Doppler modulation and the Shapiro time delay. Thanks to a careful treatment of their frequency domain signal, we were able to perform the full parameter estimation of Doppler and Shapiro-modulated binaries as seen by LISA. We find that the Doppler and Shapiro effects will allow for measuring the AGN parameters (radius and inclination of the orbit around the AGN, central black hole mass) with up to percent-level precision. Properly modeling these low-frequency environmental effects is crucial to determine the binary formation history, as well as to avoid biases in the reconstruction of the source parameters and in tests of general relativity with gravitational waves.

13+4 pages, 7+1 figures v3: corrected typo in Fig 5

Subjects by Vocabulary

arXiv: Astrophysics::High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology Astrophysics::Galaxy Astrophysics

Subjects

astro-ph.HE, Astrophysics and Astronomy, gr-qc, General Relativity and Cosmology, General Relativity and Quantum Cosmology, Astrophysics - High Energy Astrophysical Phenomena, General Relativity and Quantum Cosmology (gr-qc), High Energy Astrophysical Phenomena (astro-ph.HE), FOS: Physical sciences

Funded by
EC| LDMThExp
Project
LDMThExp
Going Beyond the WIMP: From Theory to Detection of Light Dark Matter
  • Funder: European Commission (EC)
  • Project Code: 682676
  • Funding stream: H2020 | ERC | ERC-COG
,
EC| GRU
Project
GRU
Gravitational Universe: Challenges and Opportunities
  • Funder: European Commission (EC)
  • Project Code: 101007855
  • Funding stream: H2020 | MSCA-RISE
,
EC| B Massive
Project
B Massive
Binary massive black hole astrophysics
  • Funder: European Commission (EC)
  • Project Code: 818691
  • Funding stream: H2020 | ERC | ERC-COG
,
EC| GRAMS
Project
GRAMS
GRavity from Astrophysical to Microscopic Scales
  • Funder: European Commission (EC)
  • Project Code: 815673
  • Funding stream: H2020 | ERC | ERC-COG
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Other literature type . 2022
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