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Parkes observations for project P1011 semester 2019APRS_02
Pulsars with features in their radio spectra, such as curvature or breaks seem to be special cases among the known pulsar population, with only about 20 per cent exhibiting them. Unfortunately, reliable flux density measurements besides at 1.4 GHz are often unavailable, so that their spectral morphologies and features cannot be determined accuratel... morey. We propose to utilize the unique capabilities of the newly commissioned UWL receiver at the Parkes telescope, its extremely wide instantaneous frequency coverage from about 700 to 4000 MHz together with its high sensitivity, to determine the spectra of 26 radio pulsars. These have previously been identified to exhibit spectral features or show hints thereof. The new Parkes data are crucial to determine their spectral morphologies in that frequency range, to characterize their spectral features and to resolve these within the recorded bandwidth. Our aim is to understand the physical origin of the features, namely, whether these are perhaps intrinsic to the pulsar emission in these sources, are caused by absorption processes inside the pulsar's magnetosphere, or along the line of sight. less
Astronomical and Space Sciences not elsewhere classified
01 Apr 2019
30 Sep 2019
Creative Commons Attribution 4.0 International Licence
Jankowski, Fabian; Stappers, Benjamin; Keane, Evan (2019): Parkes observations for project P1011 semester 2019APRS_02. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2019.
Access to this collection's metadata and/or files (if any) are restricted until 30 Mar 2021.
Australia Telescope National Facility
P1011 - A wideband survey of pulsars with spectral features
Pulsars are rapidly rotating and heavily magnetized neutron stars, city-sized objects that have masses that are greater than that of our Sun. They are visible through their radio emission in the form of pulses that reach the observatory when the beam sweeps past our line of sight. However, the physical processes that make pulsars shine at radio fre... morequencies are still poorly understood. Most of the pulsars seem to become dimmer with increasing radio frequency in a steady manner, but a select few (about 20 per cent of the best-studied ones) show bumps or curves in their spectra. The latter ones become first brighter and then fainter with increasing frequency when observed from Earth. In this project, we try to understand the exact behaviour of 26 of those odd sources. We do this because we want to understand why they are not like the others that have smoothly decreasing brightness. less
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