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Table 4.

Optical-FUV and X-ray properties of J1741 and the Three Musketeers.

PSR J1741-2054 B1055-52 Geminga B0656+14
τ, kyr 386 535 342 111
Ė34 0.95 3.0 3.2 3.8
B12 2.7 1.1 1.6 4.7
d, pc ∼270 ∼350 250 80 + 230 $ 250^{+230}_{-80} $ 290 ± 30
NH, 20 13 ± 1 1 . 4 0.2 + 0.3 $ 1.4^{+0.3}_{-0.2} $ 1.5 ± 0.3 3 . 0 0.9 + 0.7 $ 3.0^{+0.7}_{-0.9} $ 3 . 1 0.2 + 0.4 $ 3.1^{+0.4}_{-0.2} $
kTcold, eV 42 ± 2 70 ± 2 44 ± 1 64 ± 4 68 ± 1
Rcold, km 14.7 ± 1.1 4 . 7 0.4 + 0.5 $ 4.7^{+0.5}_{-0.4} $ 11.4 ± 1.1 13 3 + 4 $ 13^{+4}_{-3} $ 11 . 2 0.5 + 0.4 $ 11.2^{+0.4}_{-0.5} $
Lcold, 32 0.86 0.69 0.63 3.66 3.48
kThot, eV 83 ± 5 165 ± 12 195 ± 14 123 5 + 6 $ 123^{+6}_{-5} $ 131 3 + 6 $ 131^{+6}_{-3} $
Rhot, m 1200 ± 300 180 30 + 50 $ 180^{+50}_{-30} $ 45 ± 7 1000 ± 200 740 120 + 90 $ 740^{+90}_{-120} $
Lhot, 30 8.8 3.1 0.38 30 21
Thot/Tcold 2.0 2.4 4.4 1.9 1.9
Rhot/Rcold 0.082 0.038 0.004 0.077 0.066
Lhot/Lcold 0.102 0.045 0.006 0.082 0.060
αX −1.66 ± 0.04 0 . 57 0.26 + 0.25 $ -0.57^{+0.25}_{-0.26} $ −0.70 ± 0.04 −0.7 ± 0.1 0 . 74 0.12 + 0.11 $ -0.74^{+0.11}_{-0.12} $
f0, X, nJy 59 ± 3 8.1 ± 0.3 52 ± 2 17 ± 3 25 7 + 12 $ 25^{+12}_{-7} $
Ebrk, keV 1 . 21 0.05 + 0.04 $ 1.21^{+0.04}_{-0.05} $ ... ... ... 0 . 130 0.125 + 0.470 $ 0.130^{+0.470}_{-0.125} $
αopt 0 . 17 0.04 + 0.05 $ -0.17^{+0.05}_{-0.04} $ −0.24 ± 0.10 −0.46 ± 0.12 −0.32 ± 0.05 0 . 44 0.05 + 0.06 $ -0.44^{+0.06}_{-0.05} $
f0,opt, nJy ∼150 178 ± 25 110 ± 20 340 ± 7 ∼280
kTFUV, eV =kTcold 22 ± 6 30 ± 2 29 ± 2 =kTcold
RFUV, km =Rcold 15 15 15 =Rcold
E(B − V) 0.22 0.03 0.03 0.03
L1 − 10 eV, 28 2.8 5.5 1.7 7.3 6.0
ηFUV,   − 6 2.9 1.8 0.5 1.9 1.6
L1 − 10 keV, 30 1.9 1.1 3.1 1.4 1.1
ηX,   − 4 2.0 0.4 1.0 0.4 0.3
L0.1 − 100 GeV, 33 1.0 4.4 32 0.27
ηγ 0.11 0.15 0.99 0.0072

Notes. The parameters in Cols. 2 (J1741) and 6 (B0656) are for joint optical through X-ray fits with the brPL + BB + BB model, while they are for separate fits in the optical (PL + BB) and X-ray (PL + BB + BB) ranges in Cols. 3 (B1055), 4 (Geminga), and 5 (B0656). Lcold, 32 and Lhot, 30 are bolometric luminosities of the cold and hot components in units of 1032 and 1030 erg s−1, respectively; f0,opt is the optical PL normalization at ν0 = 1015 Hz; f0, X is the X-ray PL normalization at E = 1 keV; kTFUV in Cols. 3–5 is the brightness temperature estimated from the FUV flux density at the assumed NS radius RFUV = 15 km and best-fit distance; L1 − 10 eV, 28, L1 − 10 keV, 30, and L0.1 − 100 GeV, 33 are nonthermal luminosities in 1–10 eV, 1–10 keV, and 0.1–100 GeV ranges in units of 1028 erg s−1, 1030 erg s−1, and 1033 erg s−1, respectively; ηFUV,   − 6 (in units of 10−6), ηX,   − 4 (in units of 10−4), and ηγ are the corresponding radiation efficiencies. The separate X-ray fit parameters for B1055, Geminga, and B0656 are taken from Posselt et al. (2023), Mori et al. (2014), and Arumugasamy et al. (2018), respectively, while they are from Zharikov et al. (2021) for the brPL + 2BB fit for B0656 (Col. 6). The FUV fit parameters are taken from Posselt et al. (2023), Kargaltsev et al. (2005), and Durant et al. (2011).

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