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The effect of the metallicity-specific star formation history on double compact object mergers

Neijssel, C., Vigna-Gómez, A., Stevenson, S., Barrett, J. W., Gaebel, S. M., Broekgaarden, F., et al. (2019). The effect of the metallicity-specific star formation history on double compact object mergers. Monthly Notices of the Royal Astronomical Society, 490(3), 3740-3759. doi:10.1093/mnras/stz2840.

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Creators:
Vigna-Gómez, Alejandro, Author
Stevenson, Simon, Author
Barrett, Jim W., Author
Gaebel, Sebastian M., Author
Broekgaarden, Floor, Author
de Mink, Selma E., Author
Szécsi, Dorottya, Author
Vinciguerra, Serena1, Author
Mandel, Ilya, Author
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011

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Free keywords: Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR, Astrophysics, Galaxy Astrophysics, astro-ph.GA
Abstract: We investigate the impact of uncertainty in the metallicity-specific star formation rate over cosmic time on predictions of the rates and masses of double compact object mergers observable through gravitational waves. We find that this uncertainty can change the predicted detectable merger rate by more than an order of magnitude, comparable to contributions from uncertain physical assumptions regarding binary evolution, such as mass transfer efficiency or supernova kicks. We statistically compare the results produced by the COMPAS population synthesis suite against a catalog of gravitational-wave detections from the first two Advanced LIGO and Virgo observing runs. We find that the rate and chirp mass of observed binary black hole mergers can be well matched under our default evolutionary model with a star formation metallicity spread of $0.39$ dex around a mean metallicity $\left<Z\right>$ that scales with redshift $z$ as $\left<Z\right>=0.035 \times 10^{-0.23 z}$, assuming a star formation rate of $0.01 \times (1+z)^{2.77} / (1+((1+z)/2.9)^{4.7}) \, \rm{M}_\odot$ Mpc$^{-3}$ yr$^{-1}$. Intriguingly, this default model predicts that 80\% of the approximately one binary black hole merger per day that will be detectable at design sensitivity will have formed through isolated binary evolution with only dynamically stable mass transfer, i.e., without experiencing a common-envelope event.

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Dates: 2019-06-192019
Publication Status: Published in print
Pages: 22 pages, 17 figures. Data from the COMPAS simulation will be publicly available
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Rev. Type: -
Identifiers: arXiv: 1906.08136
DOI: 10.1093/mnras/stz2840
URI: http://arxiv.org/abs/1906.08136
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 490 (3) Sequence Number: - Start / End Page: 3740 - 3759 Identifier: -