J/A+A/665/A31 Neutron-star kicks in HMXBs with Gaia EDR3 (Fortin+, 2022)
Constraints to neutron-star kicks in high-mass X-ray binaries with Gaia EDR3.
Fortin F., Garcia F., Chaty S., Chassande-Mottin E., Simaz Bunzel A.
<Astron. Astrophys. 665, A31 (2022)>
=2022A&A...665A..31F 2022A&A...665A..31F (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, X-ray ; Stars, masses ; Binaries, orbits
Keywords: X-ray: binaries - stars: kinematics and dynamics - stars: evolution
Abstract:
All neutron star progenitors in neutron-star High-Mass X-ray Binaries
(NS HMXBs) undergo a supernova event that may lead to a significant
natal kick impacting the motion of the whole binary system. The space
observatory Gaia performs a deep optical survey with exquisite
astrometric accuracy, for both position and proper motions, that can
be used to study natal kicks in NS HMXBs.
We aim to survey the observed Galactic NS HMXB population and to
quantify the magnitude of the kick imparted onto their NSs, and to
highlight any possible differences arising in between the various HMXB
types.
We perform a census of Galactic NS HMXBs and cross-match existing
detections in X-rays, optical and infrared with the Gaia Early Data
Release 3 database. We retrieve their parallaxes, proper motions, and
radial velocities (when available), and perform a selection based on
the quality of the parallax measurement. We then compute their
peculiar velocities with respect to the rotating reference frame of
the Milky Way, and including their respective masses and periods, we
estimate their kick velocities through Markov Chain Monte Carlo
simulations of the orbit undergoing a supernova event.
We infer the posterior kick distributions of 35 NS HMXBs. After an
inconclusive attempt at characterising the kick distributions with
Maxwellian statistics, we find that the observed NS kicks are best
reproduced by a Gamma distribution of mean 116+18-15km/s. We
note that supergiant systems tend to have higher kick velocities than
Be High-Mass X-ray Binaries. The peculiar velocity versus
non-degenerate companion mass plane hints at a similar trend,
supergiant systems having a higher peculiar velocity independently of
their companion mass.
Description:
We make a census of confirmed High-Mass X-ray Binaries (HMXBs) in the
Milky Way and tabulate their coordinates, spectral type, orbital
parameters and provide their Gaia EDR3 counterpart. We give here the
full version of Table 1 of the paper, as we removed the sources for
which the astrometric quality was not high enough for the study.
Hence, this is the full list of confirmed Milky Way HMXBs that were
observed by Gaia.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 220 82 Confirmed Galactic HMXBs observed by Gaia EDR3
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Source Name
20- 25 A6 --- subtype HMXB subtype based on the spectral type (1)
27- 41 A15 --- SpType Spectral type of the companion star
43- 61 A19 --- r_SpType Reference for the spectral type
63- 66 F4.1 Msun M2 ?=- Companion star mass
68- 71 F4.1 Msun e_M2 ?=- Error on companion star mass
73-117 A45 --- r_M2 Reference for companion star mass
119-131 F13.8 d Per ?=- Orbital period of the binary
133-143 F11.8 d e_Per ?=- Error on the orbital period
145-163 A19 --- r_Per Reference for the orbital period
165-171 F7.5 --- e ?=- Eccentricity of the binary
173-180 F8.5 --- e_e ?=- Error on the eccentricity
182-200 A19 --- r_e Reference for the eccentricity
202-220 I19 --- GaiaEDR3 Gaia EDR3 counterpart identification number
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Note (1): HMXB subtype as follows:
Be = Be High-Mass X-ray Binary
Oe = Oe High-Mass X-ray Binary
sg = supergiant High-Mass X-ray Binary
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Acknowledgements:
Francis Fortin, fortin(at)apc.in2p3.fr
(End) Patricia Vannier [CDS] 10-Jun-2022