Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19915905b&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #159.05; Bulletin of the American Astronomical Society, Vol. 34, p.569
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Despite the progress to date at the observational and theoretical fronts, understanding the physical processes that govern pulsar radio emission continues to be an outstanding problem in pulsar astronomy. In this paper, we report on recent, simultaneous, multi-frequency observations made between the Lovell, Effelsberg and GMRT (Giant Metre-wave Radio Telescope). The general goals of this project are: (i) investigating the broadband vs narrowband nature of emission, and (ii) distinguishing between properties that are intrinsic to the emission and those caused or influenced by the magnetospheric propagation effects. This multi-frequency pulsar run is unique of its kind in that it provides long data sets of simultaneous measurements at many different frequencies spread over a very wide range (0.2 to 5 GHz). Observations were made in total power at four frequencies (0.23, 0.61, 1.4 and 4.8 GHz) while additionally polarization information is available for 1.4 and 4.8 GHz. Data from the different telescopes are processed to generate the de-dispersed time series in the EPN (European Pulsar Network) data format, which are then time-aligned for further detailed analysis. Preliminary results from ongoing analysis and interpretation are presented. In particular, we examine the nature of a variety of single-pulse phenomena such as pulse nulling and mode switching over two decades in the frequency range. Further, our analysis also reveals correlated variation of the pulse structure at different frequencies.
Gupta Yashwant
Karastergiou Aris
Kramer Mallie Mae
Lyne Andrew G.
Ramesh Bhat N. D.
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