Chandra X-ray observations of G11.2-0.3: Implications for pulsar ages

V. M. Kaspi, M. E. Roberts, G. Vasisht, E. V. Gotthelf, M. Pivovaroff, N. Kawai

Research output: Contribution to journalArticlepeer-review


We present Chandra X-Ray Observatory imaging observations of the young Galactic supernova remnant G11.2-0.3. The image shows that the previously known young 65 ms X-ray pulsar is at position (J2000) RA. 18h11m29s.22, decl. -19°25′27″.6, with 1 σ error radius of 0″.6. This is within 8″ of the geometric center of the shell. This provides strong confirming evidence that the system is younger, by a factor of ∼12, than the characteristic age of the pulsar. The age discrepancy suggests that pulsar characteristic ages can be poor age estimators for young pulsars. Assuming conventional spin-down with constant magnetic field and braking index, the most likely explanation for the age discrepancy in G11.2-0.3 is that the pulsar was born with a spin period of ∼62 ms. The Chandra image also reveals, for the first time, the morphology of the pulsar wind nebula. The elongated hard X-ray structure can be interpreted as either a jet or a Crab-like torus seen edge-on. This adds to the growing list of highly aspherical pulsar wind nebulae and argues that such structures are common around young pulsars.

Original languageEnglish (US)
Pages (from-to)371-377
Number of pages7
JournalAstrophysical Journal
Issue number1 PART 1
StatePublished - Oct 10 2001


  • Pulsars: general
  • Pulsars: individual (AX J1811.5-1926, PSR J1811-1925)
  • Supernovae: individual (G11.2-0.3)
  • X-rays: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Chandra X-ray observations of G11.2-0.3: Implications for pulsar ages'. Together they form a unique fingerprint.

Cite this