ZwCL 0008.8+5215

RA Dec z
00:11:25.6 +52:31:41 0.104

Summary

Despite this being one of the nicer double radio relic systems it has been studied very little, likely due to its recent discovery by van Weeren et al. (2011).  Using WSRT and GMRT radio observations they find that the relic spectra are consistent with diffusive shock acceleration and suggest Mach numbers of ~2 for each of the relics. Kang et al. (2012) find that their simulations of ZwCL 0008.8 are consistent with a Mach number of ~2.  van Weeren et al. (2011) also find weak evidence that the relics have a polarization of 5-25%, but they note that further observations are needed to better map the polarization properties. They were the first to estimate the redshift of the system (z=0.103) by obtaining a spectrum of the BCG, we have since confirmed this redshift with hundreds of DEIMOS spectra.
Based on Fig. 2 of van Weeren et al. (2011).
Parameter Median σ Unit Ref.
M1 - - Msun -
M2 - - Msun -
z1 - - -
z2 - - -
Δz - - km/s -
d1-2 - - Mpc -
d1-G - - Mpc -
d2-G - - Mpc -
d1-R1 - - Mpc -
d2-R2 - - Mpc -

Existing Data

Optical Imaging
  • Subaru: gr*
  • INT: VRI
  • HST: F606W*, F814W* 
  • SWIFT
  • GALEX
Spectra
  • WHT: 1 
  • DEIMOS: 4 masks observed
X-ray
  • Chandra - 30ks
  • XMM - 15 ks
Radio
  • WSRT: 241, 610 MHz
  • GMRT: 1.3-1.8 GHz

Gallery

References

  1. van Weeren, R.J. et al., 2011. A double radio relic in the merging galaxy cluster ZwCl 0008.8+5215. Astronomy and Astrophysics, 528, p.38.
  2. Feretti, L. et al., 2012. Clusters of galaxies : observational properties of the diffuse radio emission.
  3. Kang, H., Ryu, D. & Jones, T.W., 2012. DIFFUSIVE SHOCK ACCELERATION SIMULATIONS OF RADIO RELICS. The Astrophysical Journal, 756(1), p.97.
* Lensing quality imaging
^ Galaxies with spectroscopic redshifts near the cluster within a radius of 2 Mpc of the system center.