G11.2-0.3: THE YOUNG REMNANT OF A STRIPPED-ENVELOPE SUPERNOVA

Kazimierz J. Borkowski, Stephen P. Reynolds, Mallory Roberts

Research output: Contribution to journalArticle

Abstract

We present results of a 400 ks Chandra observation of the young shell supernova remnant (SNR) G11.2-0.3, containing a pulsar and pulsar-wind nebula (PWN). We measure a mean expansion rate for the shell since 2000 of 0.0277 ± 0.0018% yr-1, implying an age between 1400 and 2400 yr, and making G11.2-0.3 one of the youngest core-collapse SNRs in the Galaxy. However, we find very high absorption (AV ∼ 16m ± 2m), confirming near-IR determinations and ruling out a claimed association with the possible historical SN of 386 CE. The PWN shows strong jets and a faint torus within a larger, more diffuse region of radio emission and nonthermal X-rays. Central soft thermal X-ray emission is anticorrelated with the PWN; that, and more detailed morphological evidence, indicates that the reverse shock has already reheated all ejecta and compressed the PWN. The pulsar characteristic energy-loss timescale is well in excess of the remnant age, and we suggest that the bright jets have been produced since the recompression. The relatively pronounced shell and diffuse hard X-ray emission in the interior, enhanced at the inner edge of the shell, indicate that the immediate circumstellar medium into which G11.2-0.3 is expanding was quite anisotropic. We propose a possible origin for G11.2-0.3 in a stripped-envelope progenitor that had lost almost all its envelope mass, in an anisotropic wind or due to binary interaction, leaving a compact core whose fast winds swept previously lost mass into a dense irregular shell, and which exploded as a SN cIIb or Ibc.

Original languageEnglish (US)
Article number160
JournalAstrophysical Journal
Volume819
Issue number2
DOIs
StatePublished - Mar 10 2016

Fingerprint

pulsars
supernovae
envelopes
nebulae
shell
x rays
supernova remnants
ejecta
radio emission
compressing
young
energy dissipation
shock
radio
galaxies
timescale
expansion
energy
interactions

Keywords

  • ISM: individual objects (G11.20.3)
  • ISM: supernova remnants
  • X-rays: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

G11.2-0.3 : THE YOUNG REMNANT OF A STRIPPED-ENVELOPE SUPERNOVA. / Borkowski, Kazimierz J.; Reynolds, Stephen P.; Roberts, Mallory.

In: Astrophysical Journal, Vol. 819, No. 2, 160, 10.03.2016.

Research output: Contribution to journalArticle

Borkowski, Kazimierz J. ; Reynolds, Stephen P. ; Roberts, Mallory. / G11.2-0.3 : THE YOUNG REMNANT OF A STRIPPED-ENVELOPE SUPERNOVA. In: Astrophysical Journal. 2016 ; Vol. 819, No. 2.
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