RadioAstron reveals a change in the jet collimation profile of 3C 84

Open Access

Table 1.

Brightness temperature, Lorentz, and Doppler factor measurements for the core and hotspot.

Component	T_b, obs [K]^a	Γ_{T_b}^b	δ_{T_b}^c	Γ_kin^d	δ_kin^e
Core	(1.9 ± 3.1)×10¹²	4.9 ± 0.5	9.7 ± 1.0	–	–
Hotspot	(6.7 ± 0.7)×10¹¹	1.8 ± 0.2	3.4 ± 0.3	1.2 ± 0.1	1.8 ± 0.1

Notes. The viewing angle was assumed to be 18°.

^(a)

Brightness temperature.

^(b)

Lorentz factor determined from the brightness temperature.

^(c)

Doppler factor determined from the brightness temperature.

^(d)

Lorentz factor determined from kinematics of the jet.

^(e)

Doppler factor determined from kinematics of the jet.

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