Displacement of X-ray binaries: constraints on the natal kicks

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Table 1

Summary of models.


Model	σ _kick	η _m	Description
Model	σ _kick	η _m	NS	BH


BAC	150	1 − f_b	Basic^a	Fallback; Basic
M1	50	1 − f_b	Very low kicks	Fallback; Very low kicks
M2	100	1 − f_b	Low kicks	Fallback; Low kicks
M3	265	1 − f_b	High kicks	Fallback; High kicks
M4	150	0	Basic	No natal kicks
M5	150	1	Basic	High natal kicks
M6	150	M _NS / M _BH	Basic	Momentum-conserving kicks

Notes. σ_kick is the dispersion of kick velocity, η_m is the modified factor, and f_b is the fraction of the stellar envelope that falls back.

^(a)

Basic means σ_kick = 150 km s^-1.

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