A multi-wavelength view of the isolated neutron star eRASSU J065715.3+260428

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Volume 694 (February 2025)

A&A, 694 (2025) A160

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Table 3.

X-ray timing ephemerides for the XINS J0657 (PSR J0657+2604).

	NICER	XMM-Newton	NICER + XMM-Newton
Counts	80 051	7638	87 689
Energy range [keV]	0.3 − 2	0.2 − 2	0.2/0.3 − 2
ΔT^(a) [s]	1 356 244	51 497	10 980 326
ν_LS, min − ν_LS, max [Hz]	0.0167 − 25	0.0167 − 10
LS significance ^(b)	> 8σ	4.3σ
Δν_GL^(c) (μHz)	1	20
O_per^⋆	5 × 10⁴³	10¹⁵
p_{ν₁, ν₂}^(d) [%]	∼100	∼100
Frequency [Hz]	3.830164336(24)	3.8301649(17)	3.83016439(6)
Period [ms]	261.0854032(16)	261.08536(12)	261.085400(4)
Period derivative [s s⁻¹]			$6_{- 4}^{+ 11} \times 10^{- 15}$ $6^{+11}_{-4}\times10^{-15}$
Reference time ^(e) [MJD]	60265.4441739	60384.3138306	60265.4441739
Pulsed fraction ^(f) [%]	10.0 ± 1.0	13.7 ± 2.8
Dipolar magnetic field [G]			$1 . 2_{- 0.6}^{+ 0.9} \times 10^{12}$ $1.2^{+0.9}_{-0.6} \times 10^{12}$
Characteristic age [Myr]			$0 . 7_{- 0.5}^{+ 1.7}$ $0.7^{+1.7}_{-0.5}$
Spin-down luminosity [erg s⁻¹]			$2 . 0_{- 1.5}^{+ 4} \times 10^{34}$ $2.0^{+4}_{-1.5} \times 10^{34}$

Notes. Event arrival times used in the timing analysis were baricentrically corrected using the updated X-ray sky position of 104.313838deg/26.07500deg and the JPL DE405 solar system ephemeris.

^(a)

Elapsed time between the first and last photon of the observation.

^(b)

Frequency step used in the Gregory & Loredo (1996) search.

^(c)

For the fundamental peak, we show the significance that the observed Lomb-Scargle power is not due to white noise. The chance that the observed peak is due to noise was computed from the false-alarm probability (Baluev 2008).

^(d)

Probability that the probed frequency interval contains a periodic signal (see Zavlin et al. 2000, for details).

^(e)

Arbitrarily defined reference time in MJD (TDB) that aligns the NICER and XMM-Newton pulse profiles (Fig. 2). The reference time is chosen in such a way that phase-zero roughly coincides with the centre of the pulse.

^(f)

Relative fraction between the minimum and maximum count rate in the pulse profile in Fig. 2, computed via $p_{f} = \frac{R_{\max} - R_{\min}}{R_{\max} + R_{\min}}$ $p_{\mathrm{f}} = \frac{R_{\mathrm{max}}-R_{\mathrm{min}}}{R_{\mathrm{max}}+R_{\mathrm{min}}}$ in the 0.2 − 2 keV band.

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