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Potential kick velocity distribution of black hole X-ray binaries and implications for natal kicks

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Atri, P, Miller-Jones, JCA, Bahramian, A, Plotkin, RM, Jonker, PG, Nelemans, G, Maccarone, TJ, Sivakoff, GR, Deller, AT, Chaty, S, Torres, MAP, Horiuchi, S, McCallum, J ORCID: 0000-0002-0233-6937, Natusch, T, Phillips, CJ, Stevens, J and Weston, S 2019 , 'Potential kick velocity distribution of black hole X-ray binaries and implications for natal kicks' , Monthly Notices of the Royal Astronomical Society, vol. 489, no. 3 , pp. 3116-3134 , doi: 10.1093/mnras/stz2335.

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Abstract

We use very long baseline interferometry to measure the proper motions of three black hole X-ray binaries (BHXBs). Using these results together with data from the literature and Gaia DR2 to collate the best available constraints on proper motion, parallax, distance, and systemic radial velocity of 16 BHXBs, we determined their three-dimensional Galactocentric orbits. We extended this analysis to estimate the probability distribution for the potential kick velocity (PKV) a BHXB system could have received on formation. Constraining the kicks imparted to BHXBs provides insight into the birth mechanism of black holes (BHs). Kicks also have a significant effect on BHBH merger rates, merger sites, and binary evolution, and can be responsible for spinorbit misalignment in BH binary systems. 75 per cent of our systems have potential kicks >70kms−1⁠. This suggests that strong kicks and hence spinorbit misalignment might be common among BHXBs, in agreement with the observed quasi-periodic X-ray variability in their power density spectra. We used a Bayesian hierarchical methodology to analyse the PKV distribution of the BHXB population, and suggest that a unimodal Gaussian model with a mean of 107 ±16kms−1 is a statistically favourable fit. Such relatively high PKVs would also reduce the number of BHs likely to be retained in globular clusters. We found no significant correlation between the BH mass and PKV, suggesting a lack of correlation between BH mass and the BH birth mechanism. Our PYTHON code allows the estimation of the PKV for any system with sufficient observational constraints.

Item Type: Article
Authors/Creators:Atri, P and Miller-Jones, JCA and Bahramian, A and Plotkin, RM and Jonker, PG and Nelemans, G and Maccarone, TJ and Sivakoff, GR and Deller, AT and Chaty, S and Torres, MAP and Horiuchi, S and McCallum, J and Natusch, T and Phillips, CJ and Stevens, J and Weston, S
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Blackwell Publishing Ltd
ISSN: 0035-8711
DOI / ID Number: 10.1093/mnras/stz2335
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Copyright (2019) The Author(s).

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