Search for pulsations at high radio frequencies from accreting millisecond X-ray pulsars in quiescence

M. N. Iacolina; M. Burgay; L. Burderi; A. Possenti; T. Di Salvo

doi:10.1051/0004-6361/201014025

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Volume 519 (September 2010)

A&A, 519 (2010) A13

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Table 3:

Parameters for the source, the observation and data analyses for XTE J1814-338, XTE J1751-305 and SAX J1808.4-3658.
Pulsar names	XTE J1814-338		XTE J1751-305		SAX J1808.4-3658
Source parameters
Right ascension (J2000.0)	18 $^{\rm h}$ 13 $^{\rm m}$ 39 $.\!\!^{\rm s}$ 04		17 $^{\rm h}$ 51 $^{\rm m}$ 13 $.\!\!^{\rm s}$ 49		18 $^{\rm h}$ 08 $^{\rm m}$ 27 $.\!\!^{\rm s}$ 54
Declination (J2000.0)	-33 $^{\circ}$ 46 $^{\prime}$ 22 $.\!\!^{\prime\prime}$ 3		-30 $^{\circ}$ 37 $^{\prime}$ 23 $.\!\!^{\prime\prime}$ 4		-36 $^{\circ}$ 58 $^{\prime}$ 44 $.\!\!^{\prime\prime}$ 3
Orbital period, $P_{\rm orb}$ (s)	15 388.7229(2)		2545.342(2)		7249.156980(4)
Projected semi-major axis, $a\sin i$ (lt-ms)	390.633(9)		10.125(5)		62.812(2)
Eccentricity, e	${<}2.4 \times 10^{-5}$		${<}1.3 \times 10^{-3}$		${<}1.2 \times 10^{-4}$
Spin period, $P_{\rm S}$ (s)	0.0031811056698(1)		0.002297172972(2)		0.00249391975978(6)
Mean spin period derivative, $\dot{P}_{\rm S}$ (s s^-1)	6.7(7) $\times \ 10^{-19}$		-1.95(10) $\times \ 10^{-18}$		4.7(9) $\times \ 10^{-19}$
Ascending node passage, T₀ (MJD)	52797.8101689(9)		52 368.0129023(4)		52 499.9602472(9)
Distance, d (kpc)	8		6.7		3.5
Nominal DM (pc cm³)	$\sim$ 200		$\sim$ 400		$\sim$ 100
References	1		2		3, 4
Observation parameters			1 ${\rm st}$	2 ${\rm nd}$
Central radio frequency, $\nu_{\rm obs}$ (GHz)	6.4105	8.4535	8.4535	8.4535	4.7495	6.3515
Data series time, $\Delta t$ (s)	25 053	10 669	17 145	22 864	35 685	35 051
Sampling time, $\delta t_{\rm sam}$ ( $\mu$ s)	92	50	60	100	125	125
Samples number, $N_{\rm s}$	2²⁸	2²⁷	2²⁸	2²⁷	2²⁸	2²⁸
Nominal gain^a, G (K Jy^-1)	0.46	0.59	0.59		0.46
System temperature^a, $T_{\rm sys}$ (K)	50	25	25		50
Number of 3 MHz channels, $N_{\rm c}$	192		192		192
Data analysis parameters
Number of DMs	186	151	195	127	135	57
DM range (pc cm³)	$\sim$ 50 $\div$ 1000		$\sim$ 100 $\div$ 1700		$\sim$ 20 $\div$ 400
Local DM (pc cm³)	$\sim$ 20		$\sim$ 260		$\sim$ 230
Number of $P_{\rm orb}$ steps	1		19		1
Number of folding steps	1		11		1
Other parameters
Sky temperature, $T_{\rm sky}$ (K)	0.06	0.03	0.09		0.13	0.06
Dispersion broadening, $\delta t_{\rm DM}$ (10^-8 s)	9.5 $\times$ DM	4.2 $\times$ DM	4.2 $\times$ DM		23 $\times$ DM	9.7 $\times$ DM
Scattering broadening, $\delta t_{\rm scatt}$ (s)	$9.3 \times 10^{-9}$	$3.2 \times 10^{-9}$	$4.4\times 10^{-7}$		$9.6 \times 10^{-9}$	$3 \times 10^{-9}$

Notes. ^(a) Values derived from the Parkes website: http://www.parkes.atnf.csiro.au/observing/documentation/.

References. (1) Papitto et al. (2007); (2) Papitto et al. (2008); (3) Hartman et al. (2009); (4) Burderi et al. (2006).

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