Confirmation of glitch event observed in PSR J0742-2822 at the Argentine Institute of Radioastronomy (IAR)
ATel #15638; E. Zubieta (IAR), S. del Palacio (Chalmers University of Technology, IAR), F. Garcia (IAR), G. Gancio (IAR), C. O. Lousto (RIT), J. A. Combi (IAR, FCAGLP, UJA), L. Combi (IAR), E. Gutierrez (IAR), F. A. Lopez-Armengol (RIT), A. Simaz Bunzel (IAR), V. Sosa-Fiscella (IAR, RIT), on behalf of the PuMA Collaboration
on 30 Sep 2022; 00:37 UT
Credential Certification: Federico Garcia (fgarcia@iar.unlp.edu.ar)
Subjects: Radio, Neutron Star, Pulsar
At the Argentine Institute of Radioastronomy (IAR), we carry out a pulsar-timing program in which we observe 10 pulsars with up to daily cadence, as part of the PuMA project (Gancio et al. 2020). Observations are performed at a central frequency of 1400 MHz with the two 30 m antennas, with a bandwidth of 112 MHz and a single polarization on Antenna 1 (A1) and a bandwidth of 56 MHz and two polarizations on Antenna 2 (A2).
Here we confirm the detection of a glitch in PSR J0742-2822, recently reported by Shaw et al. (ATel #
15622), Grover et al. (ATel #
15629), and Dunn et al. (ATel #
15631). We observed PSR J0742-2822 with A1 during 27 minutes on MJD 59848.4 (2022-09-26 UTC) and with A2 during 210 minutes on MJD 59851.3 (2022-09-29 UTC). Our preliminary analysis yields a relative change in its rotation period of deltaP/P = (4.28+/-0.18)E-6 with respect to the timing solution fitted with observations performed before MJD 59835.4 (2022-09-13 UTC), thus confirming the reported glitch and its magnitude. Unfortunately, our observations do not allow us to constrain the glitch epoch more tightly, though they are consistent with the reported epoch (MJD 59389.4).
We will continue to monitor PSR J0742-2822 to improve the post-glitch timing solution.
References:
G. Gancio, C. O. Lousto, L. Combi, S. del Palacio, F. G. L. Armengol, J. A. Combi, F. Garcia, P. Kornecki, A. L. Muller and E. Gutierrez, et al., 2020,
Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomy, Astronomy and Astrophysics 633, A84
