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Table 1
Measured and derived parameters for pulsars PSR J0248+6021 and PSR J2240+5832.
| Pulsar name................... | J0248+6021 | J2240+5832 |
| Right ascension, (J2000)................... | 02:48:18.617(1) | 22:40:42.939(4) |
| Declination, (J2000)................... | +60:21:34.72(1) | +58:32:37.52(4) |
| Position epoch, (MJD)................... | 54 000 | 54 000 |
| Galactic longitude, l (degrees)................... | 136.9 | 106.6 |
| Galactic latitude, b (degrees)................... | 0.698 | –0.111 |
| Pulse frequency, ν (s-1)................... | 4.6063 | 7.1462 |
First derivative of pulse frequency,
(10-12 s-2)................... |
−1.169 | −0.7843 |
| Proper motion in right ascension, μα (mas yr-1)................... | 48 ± 10 | −6.1 ± 0.8 |
| Proper motion in declination, μδ (mas yr-1)................... | 48 ± 4 | −21.0 ± 0.4 |
| Timing data span (MJD)................... | 54 682.7 to 55 160.9 | 54 682.7 to 55 202.6 |
| Rms timing residual (μs)................... | 181 | 66 |
| Radio pulse width at 1.4 GHz, W50 (phase)................... | 0.12 | 0.07 |
| Dispersion measure, DM (cm-3 pc)................... | 370 ± 1 | 263.50 ± 0.05 |
| DM epoch, (MJD)................... | 54 000 | 54 000 |
| Rotation measure, RM (rad m-2)................... | −158 ± 6 | 24 ± 4 |
| Mean flux density at 1400 MHz, S1400 (mJy)................... | 13.7 ± 2.7 | 2.7 ± 0.7 |
| Radio spectral index................... | −1.2 ± 0.1 | −1.8 ± 0.3 |
| Radio-gamma-ray peak offset, δ................... | 0.39 ± 0.02 | 0.58 ± 0.01 |
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| Gamma-ray spectral parameters | ||
| Differential photon flux normalization, N0 (10-11 cm-2 s-1 MeV-1) | 1.5 ± 0.7 ± 0.1 | 0.13 ± 0.06 ± 0.10 |
| Integral photon flux, F100 (>100 MeV, 10-8 ph cm-2 s-1)................... | 4.0 ± 0.4 ± 0.5 | 1.5 ± 0.8 ± 0.4 |
| Integral energy flux, G100 (>100 MeV, 10-11 erg cm-2 s-1)................... | 2.9 ± 0.3 ± 0.2 | 1.0 ± 0.4 ± 0.2 |
| Exponential cut-off energy, Ec (GeV)................... | 1.2 ± 0.2 ± 0.1 | 5.7 ± 4.4 ± 1.0 |
| Power law index, Γ................... | 1.3 ± 0.1 ± 0.1 | 1.8 ± 0.6 ± 0.1 |
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| Derived quantities | ||
| Spin-down power, Ė (erg s-1)................... | 2.13 × 1035 | 2.12 × 1035 |
| Characteristic age, τc (kyr)................... | 63 | 151 |
| Surface magnetic field strength, BS (1012 G)................... | 3.5 | 1.45 |
| Magnetic field strength at the light cylinder, BLC (G)................... | 3150 | 4860 |
| Distance from NE2001, dNE (kpc)................... | >43.5 |
|
| Distance used in this work, d (kpc)................... | 2.0 ± 0.2 | 7.7 ± 0.7 or 3.8 ± 0.8 |
| Luminosity, Lγ (E > 100 MeV, 1034 erg s-1)................... | 1.4 ± 0.3 | 7.9 ± 5.2 or 2.2 ± 1.7 |
| Efficiency, η = Lγ/Ė (%)................... | 7 ± 2 | 37 ± 25 or 10 ± 8 |
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