2007ApJ...666L..93C


Query : 2007ApJ...666L..93C

2007ApJ...666L..93C - Astrophys. J., 666, L93-L96 (2007/September-2)

1E 1547.0-5408: a radio-emitting magnetar with a rotation period of 2 seconds.

CAMILO F., RANSOM S.M., HALPERN J.P. and REYNOLDS J.

Abstract (from CDS):

The variable X-ray source 1E 1547.0-5408 was identified by Gelfand & Gaensler as a likely magnetar in G327.24-0.13, an apparent supernova remnant. No X-ray pulsations have been detected from it. Using the Parkes radio telescope, we discovered pulsations with period P=2.069 s. Using the Australia Telescope Compact Array, we localized these to 1E 1547.0-5408. We measure P{dot}=(2.318±0.005)x10–11, which for a magnetic dipole rotating in vacuo gives a surface field strength of 2.2x1014 G, a characteristic age of 1.4 kyr, and a spin-down luminosity of 1.0x1035 ergs/s. Together with its X-ray characteristics, these rotational parameters of 1E 1547.0-5408 prove that it is a magnetar, only the second known to emit radio waves. The distance is ~9 kpc, derived from the dispersion measure of 830/cm3 pc. The pulse profile at a frequency of 1.4 GHz is extremely broad and asymmetric due to multipath propagation in the ISM, as a result of which only ~75% of the total flux at 1.4 GHz is pulsed. At higher frequencies the profile is more symmetric and has FWHM=0.12P. Unlike in normal radio pulsars, but in common with the other known radio-emitting magnetar, XTE J1810-197, the spectrum over 1.4-6.6 GHz is flat or rising, and we observe large, sudden changes in the pulse shape. In a contemporaneous Swift X-ray observation, 1E 1547.0-5408 was detected with record high flux, fX(1-8 keV)~5x10–12 ergs/cm2/s, 16 times the historic minimum. The pulsar was undetected in archival radio observations from 1998, implying a flux <0.2 times the present level. Together with the transient behavior of XTE J1810-197, these results suggest that radio emission is triggered by X-ray outbursts of usually quiescent magnetars.

Abstract Copyright:

Journal keyword(s): ISM: individual (G327.24-0.13) - pulsars: individual (1E 1547.0-5408) - pulsars: individual (PSR J1550-5418) - pulsars: individual (XTE J1810-197) - Stars: Neutron

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PSR J0146+6145 Psr 01 46 22.21 +61 45 03.8   28.100 25.620     ~ 527 0
2 ICRF J082526.8-501038 QSO 08 25 26.86900 -50 10 38.4877   20.94       ~ 114 1
3 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 289 0
4 PSR J1550-5418 Psr 15 50 54.18 -54 18 23.9           ~ 360 1
5 SNR G327.2-00.1 SNR 15 50 55 -54 18.0           ~ 62 1
6 3FGL J1617.4-5846 AGN 16 17 17.8913859288 -58 48 07.860059063   18.23       ~ 107 1
7 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1147 2
8 AX J1809.8-1943 Psr 18 09 51.07 -19 43 51.8           ~ 400 0
9 PSR J1841-0456 Psr 18 41 19.29 -04 56 11.4           ~ 244 1
10 2E 4673 HXB 23 01 08.14 +58 52 44.5           ~ 600 1

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2021.09.21-15:35:53

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