| Autor: |
Xue, Mengyao, Bhat, N. D. R., Tremblay, S. E., Ord, S. M., Sobey, C., Swainston, N. A., Kaplan, D. L., Johnston, Simon, Meyers, B. W., McSweeney, S. J. |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
2017PASA...34...70X |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1017/pasa.2017.66 |
| Popis: |
The Murchison Widefield Array (MWA), and its recently-developed Voltage Capture System (VCS), facilitates extending the low-frequency range of pulsar observations at high-time and -frequency resolution in the Southern Hemisphere, providing further information about pulsars and the ISM. We present the results of an initial time-resolved census of known pulsars using the MWA. To significantly reduce the processing load, we incoherently sum the detected powers from the 128 MWA tiles, which yields ~10% of the attainable sensitivity of the coherent sum. This preserves the large field-of-view (~450 deg2 at 185 MHz), allowing multiple pulsars to be observed simultaneously. We developed a WIde-field Pulsar Pipeline (WIPP) that processes the data from each observation and automatically folds every known pulsar located within the beam. We have detected 50 pulsars to date, 6 of which are millisecond pulsars. This is consistent with our expectation, given the telescope sensitivity and the sky coverage of the processed data (~17,000 deg2). For ten pulsars, we present the lowest-frequency detections published. For a subset of the pulsars, we present multi-frequency pulse profiles by combining our data with published profiles from other telescopes. Since the MWA is a low-frequency precursor to the Square Kilometre Array (SKA), we use our census results to forecast that a survey using Phase 1 of SKA-Low (SKA1-Low) can potentially detect around 9400 pulsars. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
