Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19915902g&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #159.02; Bulletin of the American Astronomical Society, Vol. 34, p.568
Other
Scientific paper
The recently completed Giant Metre-wave Radio Telescope (GMRT) is an excellent instrument for pulsar studies. Besides providing a large collecting area, it has a unique capability for simultaneous multi-frequency pulsar observations. In this paper, we report on some new results from pilot pulsar studies during the commissioning phase of the GMRT. High sensitivity single pulse observations at 325 MHz of PSR B0329+54 have allowed a detailed study of its emission geometry. We have identified nine components, arranged in a conal beam geometry with four conal rings around the central core component. From the detection of retardation and aberration effects seen in the asymmetric location of the conal components, we are able to estimate the emission height and polar cap location for each of the 4 cones of emission. The inferred heights range from 180 to 1150 km for the inner to outermost cones, whereas their polar cap locations are all in the range 0.5-0.6 of the polar cap radius. Results from similar studies for other pulsars are also summarised in this paper. Further, from a sequence of simultaneous, dual frequency single pulse observations at 238 and 610 MHz of PSR B0329+54, we have found that the longitude separation of subpulses at the two frequencies is less than that for the corresponding components in the average profile. This frequency dependence is interpreted as clear evidence for a conal emission geometry for this pulsar. The simultaneous dual frequency observations also allow an accurate determination of the dispersion measures of pulsars. Long term variations of these are useful probes of the distribution of electron density inhomogeneities in the ISM. Some results from such measurements over a one year time span are presented. Results from high quality pulsar dynamic spectra observations with the GMRT are also highlighted in this paper.
Gangadhara R. T.
Gil Janusz
Gupta Yashwant
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