Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies
MetadataShow full item record
© 2018. The American Astronomical Society. All rights reserved.. Rare intermittent pulsars pose some of the most challenging questions surrounding the pulsar emission mechanism, but typically have relatively minimal low-frequency (?300 MHz) coverage. We present the first low-frequency detection of the intermittent pulsar J1107-5907 with the Murchison Widefield Array (MWA) at 154 MHz and the simultaneous detection from the recently upgraded Molonglo Observatory Synthesis Telescope (UTMOST) at 835 MHz, as part of an ongoing observing campaign. During a 30 minute simultaneous observation, we detected the pulsar in its bright emission state for approximately 15 minutes, where 86 and 283 pulses were detected above a signal-to-noise threshold of 6 with the MWA and UTMOST, respectively. Of the detected pulses, 51 had counterparts at both frequencies and exhibited steep spectral indices for both the bright main pulse component and the precursor component. We find that the bright state pulse energy distribution is best parameterized by a log-normal distribution at both frequencies, contrary to previous results that suggested a power law distribution. Further low-frequency observations are required in order to explore in detail aspects such as pulse-to-pulse variability and intensity modulations, as well as to better constrain the signal propagation effects due to the interstellar medium and intermittency characteristics at these frequencies. The spectral index, extended profile emission covering a large fraction of pulse longitude, and the broadband intermittency of PSR J1107-5907 suggest that future low-frequency pulsar searches - for instance, those planned with SKA-Low - will be in an excellent position to find and investigate new pulsars of this type.
Showing items related by title, author, creator and subject.
Noutsos, A.; Sobey, C.; Kondratiev, V.; Weltevrede, P.; Verbiest, J.; Karastergiou, A.; Kramer, M.; Kuniyoshi, M.; Alexov, A.; Breton, R.; Bilous, A.; Cooper, S.; Falcke, H.; Grießmeier, J.; Hassall, T.; Hessels, J.; Keane, E.; Oslowski, S.; Pilia, M.; Serylak, M.; Stappers, B.; Ter Veen, S.; Van Leeuwen, J.; Zagkouris, K.; Anderson, K.; Bähren, L.; Bell, M.; Broderick, J.; Carbone, D.; Cendes, Y.; Coenen, T.; Corbel, S.; Eislöffel, J.; Fender, R.; Garsden, H.; Jonker, P.; Law, C.; Markoff, S.; Masters, J.; Miller-Jones, James; Molenaar, G.; Osten, R.; Pietka, M.; Rol, E.; Rowlinson, A.; Scheers, B.; Spreeuw, H.; Staley, T.; Stewart, A.; Swinbank, J.; Wijers, R.; Wijnands, R.; Wise, M.; Zarka, P.; Van Der Horst, A. (2015)Aims: We present the highest-quality polarisation profiles to date of 16 non-recycled pulsars and four millisecond pulsars, observed below 200 MHz with the LOFAR high-band antennas. Based on the observed profiles, we ...
Kondratiev, V.; Verbiest, J.; Hessels, J.; Bilous, A.; Stappers, B.; Kramer, M.; Keane, E.; Noutsos, A.; Oslowski, S.; Breton, R.; Hassall, T.; Alexov, A.; Cooper, S.; Falcke, H.; Grießmeier, J.; Karastergiou, A.; Kuniyoshi, M.; Pilia, M.; Sobey, Charlotte; Ter Veen, S.; Van Leeuwen, J.; Weltevrede, P.; Bell, M.; Broderick, J.; Corbel, S.; Eisloffel, J.; Markoff, S.; Rowlinson, A.; Swinbank, J.; Wijers, R.; Wijnands, R.; Zarka, P. (2016)We report the detection of 48 millisecond pulsars (MSPs) out of 75 observed thus far using the LOw-Frequency ARray (LOFAR) in the frequency range 110-188 MHz. We have also detected three MSPs out of nine observed in the ...
Xue, M.; Bhat, Ramesh; Tremblay, S.; Ord, S.; Sobey, Charlotte; Swainston, N.; Kaplan, D.; Johnston, S.; Meyers, B.; McSweeney, S. (2017)The Murchison Widefield Array, and its recently developed Voltage Capture System, facilitates extending the low-frequency range of pulsar observations at high-time and -frequency resolution in the Southern Hemisphere, ...