Absolute Broadband Polarization of PSR B0329+54: A Glimpse of the Core Emission Process

Details Absolute Broadband Polarization of PSR B0329+54: A Glimpse of the Core Emission Process Absolute Broadband Polarization of PSR B0329+54: A Glimpse of the Core Emission Process

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..983..136m&link_type=abstract

40 YEARS OF PULSARS: Millisecond Pulsars, Magnetars and More. AIP Conference Proceedings, Volume 983, pp. 136-138 (2008).

Computer Science

Pulsars, Neutron Stars, Radiation Mechanisms, Polarization, Radio Telescopes And Instrumentation, Heterodyne Receivers

Scientific paper

In this paper we report multifrequency single pulse polarization observations of the PSR B0329+54 normal mode from the Giant Meterwave Radio Telescope (GMRT) at 325 and 610 MHz and the Effelsberg Observatory at 2695 MHz. Towards the central part of the polarization position-angle traverse there is an unusual ``arc''-like structure, which is comprised of a broadband ``kink'' and a frequency-dependent ``spot.'' The features are intimately connected with the intensity dependence of the core component: the stronger emission arrives earlier and its linear polarization is displaced farther along the ``kink''. Moreover, at high intensities, the circular polarization is LH/RH antisymmetric; the nearly complete RH circular is characteristic of the weaker, later core subpulses. We find that the ``kink'' emission is associated with the extraordinary (X) propagation mode, and hence propagation effects do not appear capable of producing the core component's broadband, intensity-dependent emission. Rather, the overall evidence points to a largely geometric interpretation in which the ``kink'' provides a rare glimpse of the accelerating cascade or height-dependent amplifier responsible for the core radiation.

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