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Clustering between High-mass X-Ray Binaries and OB Associations in the Milky Way

Abstract : We present the first direct measurement of the spatial cross-correlation function of high-mass X-ray binaries (HMXBs) and active OB star-forming complexes in the Milky Way. This result relied on a sample containing 79 hard X-ray-selected HMXBs and 458 OB associations. Clustering between the two populations is detected with a significance above 7σ for distances <1 kpc. Thus, HMXBs closely trace the underlying distribution of the massive star-forming regions that are expected to produce the progenitor stars of HMXBs. The average offset of 0.4 ± 0.2 kpc between HMXBs and OB associations is consistent with being due to natal kicks at velocities of the order of 100 ± 50 km s-1. The characteristic scale of the correlation function suggests an average kinematical age (since the supernova phase) of ~4 Myr for the HMXB population. Despite being derived from a global view of our Galaxy, these signatures of HMXB evolution are consistent with theoretical expectations as well as observations of individual objects.
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https://hal-insu.archives-ouvertes.fr/insu-03622442
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Submitted on : Tuesday, March 29, 2022 - 8:58:10 AM
Last modification on : Thursday, March 31, 2022 - 3:27:54 AM

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A. Bodaghee, J. A. Tomsick, J. Rodriguez, J. B. James. Clustering between High-mass X-Ray Binaries and OB Associations in the Milky Way. The Astrophysical Journal, 2012, 744, ⟨10.1088/0004-637X/744/2/108⟩. ⟨insu-03622442⟩

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