Previous | Session 176 | Next | Author Index | Block Schedule
D. M. Katz (US Naval Academy), K. K. Dyer, N. E. Kassim (Naval Research Laboratory), R. A. Perley (National Radio Astronomy Observatory), K. M. Blundell (Oxford University), W. C. Erickson (University of Tasmania)
We present 74 and 330 MHz Very Large Array (VLA) cycling snapshot observations of ~ 20 resolved radio galaxies and supernova remnants from the 3C catalog. Most of the objects range from a few tens to a few hundreds of Janskys integrated flux density, demonstrating the improved sensitivity and uv coverage of the 27-antenna VLA 74 MHz system compared to an initial 8-antenna system. They also demonstrate that simple, angle-invariant self-calibration and now commonly available radio frequency interference excision and wide-field imaging techniques are sufficient for making good images of these relatively bright, isolated objects. More advanced techniques, as are now being demonstrated with the VLA Low Frequency Sky Survey, are needed to push to the full field-of-view imaging required to study weaker sources. We present total intensity images at 74 and 330 MHz together with spectral index maps. After demonstrating that the gain stability of the 74 MHz VLA system is accurate to 5%, we combine our new measurements with those collected by Kühr and Laing & Peacock, and rederive the low-frequency spectra of all the sources in our sample. Basic research in radio astronomy at the Naval Research Laboratory, is supported by the Office of Naval Research.
Previous | Session 176 | Next
Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.