4U 1907+09: a HMXB running away from the Galactic plane
V.V.Gvaramadze, S.Roeser, R.-D.Scholz, E.Schilbach

TL;DR
This paper reports the discovery of a bow shock around the high-mass X-ray binary 4U 1907+09, confirming its high velocity and runaway status, and compares it with a similar bow shock around Vela X-1.
Contribution
First detection of a bow shock around 4U 1907+09, confirming its high-velocity runaway nature through proper motion measurements and comparison with Vela X-1.
Findings
4U 1907+09 has a peculiar transverse velocity of approximately 160 km/s.
The bow shock's orientation aligns with the system's motion away from the Galactic plane.
Comparison with Vela X-1's bow shock highlights similarities in HMXB runaway phenomena.
Abstract
We report the discovery of a bow shock around the high-mass X-ray binary (HMXB) 4U 1907+09 using the Spitzer Space Telescope 24 m data (after Vela X-1 the second example of bow shocks associated with HMXBs). The detection of the bow shock implies that 4U 1907+09 is moving through the space with a high (supersonic) peculiar velocity. To confirm the runaway nature of 4U 1907+09, we measured its proper motion, which for an adopted distance to the system of 4 kpc corresponds to a peculiar transverse velocity of km/s, meaning that 4U 1907+09 is indeed a runaway system and supporting the general belief that most of HMXBs possess high space velocities. The direction of motion of 4U 1907+09 inferred from the proper motion measurement is consistent with the orientation of the symmetry axis of the bow shock, and shows that the HMXB is running away from the Galactic…
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