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N.E. Gugliucci (University of Virginia), G.B. Taylor (University of New Mexico), A.B. Peck (Harvard-Smithsonian Center for Astrophysics), M. Giroletti (INAF Istituto di Radioastronomia)
We present multi-frequency VLBA observations of two polarized Compact Symmetric Objects (CSOs), J0000+4054 and J1826+1831, and a polarized CSO candidate, J1915+6548. The former two sources were the first CSOs to have detectable polarization. Using the wavelength-squared dependence of Faraday rotation, we obtained rotation measures (RMs) of -180±10 rad/m2 and 1540±7 rad/m2 for the latter two sources, which are lower than what is expected of CSOs (few 1000 rad/m2) and, depending on the path length of the Faraday screens, require magnetic fields from 0.03 to 6 micro Gauss. These CSOs may be more heavily affected by Doppler boosting than their unpolarized counterparts, suggesting that a jet-axis orientation more inclined towards the line of sight is necessary to detect any polarization. This allows for low RMs if the polarized components are oriented away from the depolarizing circumnuclear torus. These observations also add a fourth epoch to the proper motion studies of J0000+4054 and J1826+1831, constraining their kinematic age estimates to >610 yrs and 2600±490 yrs, respectively. The morphology, spectrum, and component motions of J1915+6548 are discussed in light of its new classification as a CSO candidate.
This research was carried out as part of a National Radio Astronomy Observatory Graduate Summer Student Research Assistantship.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.