Updated phase coherent timing solution of the isolated neutron star RX J0720.4–3125 using recent XMM-Newton and Chandra observations

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Volume 521 (October 2010)

A&A, 521 (2010) A11

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Table 3:

P and $\dot{f}$ derived from different methods in this paper, compared to previous results.
Solution	Period-8.391115	$\dot{f}$	rms	d.o.f.	$\chi ^{2}$ /d.o.f.
	$\times$ 10^-7 [s]	$\times$ 10^-16 [Hz/s]	[s]
This work, hard band
``all data''	3.336(22)	-9.961(67)	0.62	70-3	45
After fitting a sine			0.29	70-5	7.8
After fitting an abs(sine)			0.31	70-5	8.6
without ROSAT	3.362(39)	-9.946(74)	0.60	64-3	47
After fitting a sine			0.19	64-5	5.3
After fitting an abs(sine)			0.21	64-5	6.5
without Chandra	3.310(22)	-9.940(71)	0.61	58-3	47
After fitting a sine			0.31	58-5	9.7
After fitting an abs(sine)			0.33	58-5	8.7
Z₁² ``all data''	3.09(14)	-9.992(61)	0.73	70-3	64
Z₁² without ROSAT	2.96(13)	-10.047(34)	0.58	64-3	46
Z₁² without Chandra	3.09(13)	-9.980(36)	0.72	58-3	51
This work, soft band
``all data''	3.429(22)	-9.956(72)	0.50	70-3	40
Z₁² ``all data''	3.31(62)	-9.959(17)	0.50	70-3	39
Previous work (applied to the hard band)
vK07 (``all data'')	2.670(84)	-9.88(13)	0.97	70-3	81
vK07 (without ROSAT)	2.846(77)	-9.74(04)	1.30	64-3	207
KvK05 (``all data'')	3.20(13)	-9.918(15)	0.64	70-3	56
KvK05 (Chandra)	3.05(16)	-9.97(06)	0.64	12-3	57

Notes. For the timing solution in this work we always excluded the Chandra HRC observation 7251. Since the phase residuals seem to follow a periodic pattern we fitted a sine and an abs(sine), see Sect. 6. All errors correspond to 1 $\sigma$ confidence (for the Z₁² solution see Ransom et al. 2002 with errors scaled to $\sqrt {\chi ^{2}/{\rm d.o.f.}}$ , for the phase coherent solutions, see Sect. 5).

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