Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-26
Astrophys.J. 620 (2005) L95-L98
Astronomy and Astrophysics
Astrophysics
4 pages + 1 EPS figure, in emulateapj style. ApJ Letters, in press
Scientific paper
10.1086/428725
We present 21-cm HI observations from the Southern Galactic Plane Survey of the field around the anomalous X-ray pulsar 1E 1048.1-5937, a source whose X-ray properties imply that it is a highly magnetized neutron star (a "magnetar"). These data reveal an expanding hydrogen shell, GSH 288.3-0.5-28, centered on 1E 1048.1-5937, with a diameter of 35x23 pc (for a distance of 2.7 kpc) and an expansion velocity of approx 7.5 km/s. We interpret GSH 288.3-0.5-28 as a wind bubble blown by a 30-40 M_sun star, but no such central star can be readily identified. We suggest that GSH 288.3-0.5-28 is the wind bubble blown by the massive progenitor of 1E 1048.1-5937, and consequently propose that magnetars originate from more massive progenitors than do radio pulsars. This may be evidence that the initial spin period of a neutron star is correlated with the mass of its progenitor, and implies that the magnetar birth rate is only a small fraction of that for radio pulsars.
Dickey John M.
Gaensler Bryan M.
Green Andrew J.
Haverkorn Marijke
McClure-Griffiths Naomi M.
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