VLBI observations of SN 2008iz

I. Expansion velocity and limits on anisotropic expansion

A. Brunthaler, I. Martí-Vidal, K. M. Menten, M. J. Reid, C. Henkel, G. C. Bower, H. Falcke, H. Feng, P. Kaaret, Nathaniel Butler, A. N. Morgan, A. Weiß

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We present observations of the recently discovered supernova 2008iz in M 82 with the VLBI High Sensitivity Array at 22 GHz, the Very Large Array at frequencies of 1.4, 4.8, 8.4, 22 and 43 GHz, and the Chandra X-ray observatory. The supernova was clearly detected in two VLBI images separated by 11 months. The source shows a ring-like morphology and expands with a velocity of ∼23 000 km s-1. The most likely explosion date is in mid-February 2008. The measured expansion speed is a factor of ∼2 higher than expected under the assumption that synchrotron self-absorption dominates the light curve at the peak, indicating that this absorption mechanism may not be important for the radio emission. We find no evidence for an asymmetric explosion. The VLA spectrum shows a broken power law, indicating that the source was still optically thick at 1.4 GHz in April 2009. Finally, we report upper limits on the X-ray emission from SN 2008iz and a second radio transient recently discovered by MERLIN observations.

Original languageEnglish (US)
Article numberA27
JournalAstronomy and Astrophysics
Volume516
Issue number18
StatePublished - Jun 2010
Externally publishedYes

Fingerprint

very long base interferometry
very long baseline interferometry
supernovae
explosions
explosion
radio
expansion
Very Large Array (VLA)
self absorption
radio emission
light curve
observatories
synchrotrons
power law
x rays
observatory
sensitivity
rings
speed

Keywords

  • galaxies: individual: M 82
  • radio continuum: general
  • stars: supernovae: general
  • stars: supernovae: individual: SN2008iz

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Brunthaler, A., Martí-Vidal, I., Menten, K. M., Reid, M. J., Henkel, C., Bower, G. C., ... Weiß, A. (2010). VLBI observations of SN 2008iz: I. Expansion velocity and limits on anisotropic expansion. Astronomy and Astrophysics, 516(18), [A27].

VLBI observations of SN 2008iz : I. Expansion velocity and limits on anisotropic expansion. / Brunthaler, A.; Martí-Vidal, I.; Menten, K. M.; Reid, M. J.; Henkel, C.; Bower, G. C.; Falcke, H.; Feng, H.; Kaaret, P.; Butler, Nathaniel; Morgan, A. N.; Weiß, A.

In: Astronomy and Astrophysics, Vol. 516, No. 18, A27, 06.2010.

Research output: Contribution to journalArticle

Brunthaler, A, Martí-Vidal, I, Menten, KM, Reid, MJ, Henkel, C, Bower, GC, Falcke, H, Feng, H, Kaaret, P, Butler, N, Morgan, AN & Weiß, A 2010, 'VLBI observations of SN 2008iz: I. Expansion velocity and limits on anisotropic expansion', Astronomy and Astrophysics, vol. 516, no. 18, A27.
Brunthaler A, Martí-Vidal I, Menten KM, Reid MJ, Henkel C, Bower GC et al. VLBI observations of SN 2008iz: I. Expansion velocity and limits on anisotropic expansion. Astronomy and Astrophysics. 2010 Jun;516(18). A27.
Brunthaler, A. ; Martí-Vidal, I. ; Menten, K. M. ; Reid, M. J. ; Henkel, C. ; Bower, G. C. ; Falcke, H. ; Feng, H. ; Kaaret, P. ; Butler, Nathaniel ; Morgan, A. N. ; Weiß, A. / VLBI observations of SN 2008iz : I. Expansion velocity and limits on anisotropic expansion. In: Astronomy and Astrophysics. 2010 ; Vol. 516, No. 18.
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