The middle-aged pulsar PSR J1741–2054 and its bow-shock nebula in the far-ultraviolet

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Table 3.

Properties of BSN regions.

Region	η	α	I_ν, 0	F₋₁₄	L₂₉
Apex	1.32 ± 0.21	$- 5 . 2_{- 6.9}^{+ 3.3}$ $-5.2^{+3.3}_{-6.9}$	$1060_{- 300}^{+ 90}$ $1060^{+90}_{-300}$	1.3	1.1
Front	1.58 ± 0.10	$- 1 . 3_{- 1.3}^{+ 1.0}$ $-1.3^{+1.0}_{-1.3}$	$610_{- 30}^{+ 20}$ $610^{+20}_{-30}$	9.7	8.4
Back	1.54 ± 0.11	$- 1 . 8_{- 1.6}^{+ 1.3}$ $-1.8^{+1.3}_{-1.6}$	$159_{- 7}^{+ 5}$ $159^{+5}_{-7}$	7.6	6.6
Blob	1.33 ± 0.16	$- 5 . 1_{- 4.5}^{+ 2.6}$ $-5.1^{+2.6}_{-4.5}$	$420_{- 70}^{+ 20}$ $420^{+20}_{-70}$	3.0	2.6
Interior	2.01 ± 0.15	$+ 2 . 7_{- 1.2}^{+ 1.1}$ $+2.7^{+1.1}_{-1.2}$	130 ± 10	11	9.7
Half	1.62 ± 0.06	−1.0 ± 0.7	243 ± 6	27	24

Notes. The second column presents the count rate ratios, η = C_F125LP/C_F140LP. The third through sixth columns provide properties of the BSN regions assuming an unabsorbed PL spectrum f_ν = f_ν, 0(ν/ν₀)^α for each of them; I_ν, 0 = f_ν, 0/A_s is the specific intensity normalization at λ = 1500 Å, in units of nJy arcsec⁻²; F₋₁₄ is the unabsorbed flux estimate in the 1250–1850 Å FUV band, in units of 10⁻¹⁴ erg cm⁻² s⁻¹ ; and L₂₉ is the FUV luminosity, in units of 10²⁹ erg s⁻¹. The color excess E(B − V) = 0.22 is assumed.

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