The intrinsic size of Sagittarius a* from 0.35 to 6 cm

Geoffrey C. Bower*, W. M. Goss, Heino Falcke, Donald C. Backer, Yoram Lithwick

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

121 Scopus citations


We present new high-resolution observations of Sagittarius A* at wavelengths of 17.4-23.8 cm with the Very Large Array in the A configuration with the Pie Town Very Long Baseline Array (VLBA) antenna. We use the measured sizes to calibrate the interstellar scattering law and find that the major axis size of the scattering law is smaller by ∼6% than previous estimates. Using the new scattering law, we are able to determine the intrinsic size of Sgr A* at wavelengths from 0.35 to 6 cm using existing results from the VLBA. The new law increases the intrinsic size by ∼20% at 0.7 cm and <5% at 0.35 cm. The intrinsic size is 13-3+7RS at 0.35 cm and is proportional to λγ, where γ is in the range 1.3-1.7.

Original languageEnglish (US)
Pages (from-to)L127-L130
JournalAstrophysical Journal
Issue number2 II
StatePublished - Sep 10 2006


  • Galaxies: active
  • Galaxy: center
  • Scattering
  • Techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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