Publication Title
The Astrophysical Journal
Volume
600
Publication Date
2004
Document Type
Article
First and Last Page
127
Abstract
We present the results of a high angular resolution study of the BL Lac object Markarian 501 in the radio band. We consider data taken at 14 different epochs, ranging between 1.6 and 22 GHz in frequency, and including new Space VLBI observations obtained on 2001 March 5 and 6 at 1.6 and 5 GHz. We study the kinematics of the parsec-scale jet and estimate its bulk velocity and orientation with respect to the line of sight. Limb-brightened structure in the jet is clearly visible in our data, and we discuss its possible origin in terms of velocity gradients in the jet. Quasi-simultaneous, multiwavelength observations allow us to map the spectral index distribution and to compare it to the jet morphology. Finally, we estimate the physical parameters of the parsec-scale jet.
Recommended Citation
Giroletti, M., Giovannini, G., Ferretti, L., Cotton, W. D., Edwards, P. G., Lara, L., Marscher, A. P., Mattox, J. R., Piner, B. G., & Venturi, T. (2004). Parsec-Scale Properties of Markarian 501. The Astrophysical Journal, 600, 127. Retrieved from https://poetcommons.whittier.edu/phys/53