The compact X-ray source 1E 1547.0-5408 and the radio shell G327.24-0.13: A new proposed association between a candidate magnetar and a candidate supernova remnant

Joseph D. Gelfand, B. M. Gaensler

Research output: Contribution to journalArticle

Abstract

We present new observations of the field centered on X-ray source 1E 1547.0-5408. Analysis of a new Chandra observation shows that it is unresolved at arcsecond resolution, and analysis of a new XMM-Newton observation shows that its X-ray spectrum is best described by an absorbed power-law and blackbody model. A comparison of the X-ray flux observed from 1E 1547.0-5408 between 1980 and 2006 reveals that its absorbed 0.5-10 keV X-ray flux decreased from ∼2 × 10-12 to ∼3 × 10-13 ergs cm-2 during this period. The most recent XMM-Newton observation detected no pulsations from 1E 1547.0-5408, allowing us to put a 5 σ confidence upper limit of 14% for the 0.5-10 keV peak-to-peak pulsed fraction for sinusoidal pulses with periods slower than 1.8 s. A near-infrared observation shows a magnitude Ks = 15.9 ±0.2 source near 1E 1547.0-5408, but the implied X-ray to infrared flux ratio indicates that it is an unrelated field source, limiting the IR magnitude of any counterpart to 1E 1547.0-5408 to ≳17.5. Archival radio observations reveal that 1E 1547.0-5408 sits at the center of a faint, small radio shell, G327.24-0.13, possibly a previously unidentified supernova remnant. The X-ray properties of 1E 1547.0- 5408 suggest that it is a magnetar, and the spatial coincidence between this source and G327.24-0.13 suggests that 1E 1547.0-5408 is associated with a young supernova remnant, supporting a neutron star interpretation. If both the nature of 1E 1547.0-5408 and G327.24-0.13 and their physical association are confirmed, this pair will be an important addition to the small number of known associations between magnetars and supernova remnants.

Original languageEnglish (US)
Pages (from-to)1111-1118
Number of pages8
JournalAstrophysical Journal
Volume667
Issue number2 I
DOIs
StatePublished - 2007

Keywords

  • ISM: individual (G327.24-0.13)
  • Stars: neutron
  • Supernova remnants
  • X-rays: individual (1E 1547.0-5408)
  • X-rays: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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