Abstract Details
| Name: Santaji N Katore Affiliation: NCRA Conference ID: ASI2018_924 Title : Wideband primary beam measurements for the upgraded GMRT Authors and Co-Authors : Biny Sebastian(NCRA), Ruta Kale(NCRA), Dharam V. Lal(NCRA) & Ishwara-Chandra C.H.(NCRA) Abstract Type : Poster Abstract Category : Instrumentation and Techniques Abstract : Giant Metrewave Radio Telescope is the world's most sensitive low-frequency radio interferometer and it is in the final stage of the upgrade. One of the key objectives of this upgrade is to improve sensitivity along with obtaining near seamless frequency coverage from 100 to 1500 MHz. As a part of this upgrade, new wideband feeds and digital backend with 400 MHz bandwidth capability have been put in place. Correction for the frequency dependent primary beam is fundamental to measure flux densities of sources detected in the images made with the wideband system. Radio images, if not corrected for the primary beam, would show an artificial steepening of the spectrum in addition to the drop in flux levels of sources as one moves away from the phase center. Here, we present our measurements of the frequency dependent primary beam shapes for the new feeds of the band 250-500 MHz. The applications of these measurements to the wideband images are also presented. |