Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-31
Astrophys.J.648:L127-L130,2006
Astronomy and Astrophysics
Astrophysics
ApJL, in press
Scientific paper
10.1086/508019
We present new high-resolution observations of Sagittarius A* at wavelengths of 17.4 to 23.8 cm with the Very Large Array in A configuration with the Pie Town Very Long Baseline Array 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 cm to 6 cm using existing results from the VLBA. The new law increases the intrinsic size at 0.7 cm by ~20% and <5% at 0.35 cm. The intrinsic size is 13^{+7}_{-3} Schwarzschild radii at 0.35 cm and is proportional to lambda^gamma, where gamma is in the range 1.3 to 1.7.
Backer Donald C.
Bower Geoffrey C.
Falcke Heino
Goss William Miller
Lithwick Yoram
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