Deep searches for decameter wavelength pulsed emission from radio-quiet gamma-ray pulsars

Abstract

We report the results of (a) extensive follow-up observations of the gamma-ray pulsar J1732-3131 that has been recently detected at decameter wavelengths, and (b) deep searches for counterparts of 9 other radio-quiet gamma-ray pulsars at 34 MHz, using the Gauribidanur radio telescope. No periodic signal from J1732-3131 could be detected above a detection threshold of $8\sigma$, even with an effective integration time of more than 40 hours. However, the average profile obtained by combining data from several epochs, at a dispersion measure of 15.44 pc/cc, is found to be consistent with that from the earlier detection of this pulsar at a confidence level of 99.2 %. We present this consistency between the two profiles as an evidence that J1732-3131 is a faint radio pulsar with an average flux density of 200--400 mJy at 34 MHz. Detection sensitivity of our deep searches, despite the extremely bright sky background at such low frequencies, is generally comparable to that of higher frequency searches for these pulsars, when scaled using reasonable assumptions about the underlying pulsar spectrum. We provide details of our deep searches, and put stringent upper limits on the decameter wavelength flux densities of several radio-quiet gamma-ray pulsars.

8 pages, 3 figures, 2 tables; Accepted for publication in MNRAS

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• New upper limits on low-frequency radio emission from isolated neutron stars with LOFAR
• Detection of radio emission from the gamma-ray pulsar J1732-3131 at 327 MHz
• Searching for the optical counterparts of two young gamma-ray pulsars
• Search for periodic emission of five gamma-ray pulsars at the frequency of 111 MHz
• Giant radio pulses in the magnetar XTE J1810-197 detected with the IAR's telescopes