TY - JOUR

T1 - A MeerKAT view of the pulsars in the globular cluster NGC 6522

AU - Abbate, F.

AU - Ridolfi, A.

AU - Freire, P. C.C.

AU - Padmanabh, P. V.

AU - Balakrishnan, V.

AU - Buchner, S.

AU - Zhang, L.

AU - Kramer, M.

AU - Stappers, B. W.

AU - Barr, E. D.

AU - Chen, W.

AU - Champion, D.

AU - Ransom, S.

AU - Possenti, A.

N1 - Funding Information: The MeerKAT telescope is operated by the South African Radio Astronomy Observatory, which is a facility of the National Research Foundation, an agency of the Department of Science and Innovation. SARAO acknowledges the ongoing advice and calibration of GPS systems by the National Metrology Institute of South Africa (NMISA) and the time space reference systems department department of the Paris Observatory. TRAPUM observations used the FBFUSE and APSUSE computing clusters for data acquisition, storage and analysis. These clusters were funded and installed by the Max- Planck-Institut für Radioastronomie and the Max-Planck-Gesellschaft. PTUSE was developed with support from the Australian SKA Office and Swinburne University of Technology. MeerTIME data is housed on the OzSTAR supercomputer at Swinburne University of Technology. The OzSTAR program receives funding in part from the Astronomy National Collaborative Research Infrastructure Strategy (NCRIS) allocation provided by the Australian Government. The authors also acknowledge MPIfR funding to contribute to MeerTIME infrastructure. The Parkes radio telescope is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO. We acknowledge the Wiradjuri people as the Traditional Owners of the Observatory site. F.A., A.R., P.C.C.F., P.V.P., V.B., M.K., E.D.B., W.C., D.C. acknowledge continuing valuable support from the Max-Planck Society. This work is supported by the Max-Planck Society as part of the “LEGACY” Collaboration on low-frequency gravitational wave astronomy. AR and AP gratefully acknowledge financial support by the research grant “iPeska” (P.I. Andrea Possenti) funded under the INAF national call Prin-SKA/CTA approved with the Presidential Decree 70/2016. Part of this work has been funded using resources from the INAF Large Grant 2022 “GCjewels” (P.I. Andrea Possenti) approved with the Presidential Decree 30/2022. L.Z. is supported by ACAMAR Postdoctoral Fellowship and the National Natural Science Foundation of China (Grant No. 12103069). The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. SMR is a CIFAR Fellow and is supported by the NSF Physics Frontiers Center award 2020265.

PY - 2023/12

Y1 - 2023/12

N2 - We present the results of observations aimed at discovering and studying pulsars in the core-collapsed globular cluster (GC) NGC 6522 performed by the MeerTIME and TRAPUM Large Survey Project with the MeerKAT telescope.We have discovered two new isolated pulsars bringing the total number of known pulsars in the cluster to six. PSR J1803-3002E is a mildly recycled pulsar with a spin period of 17.9 ms, while pulsar PSR J1803-3002F is a slow pulsar with a spin period of 148.1 ms. The presence of isolated and slow pulsars is expected in NGC 6522, and confirms the predictions of previous theories for clusters at this stage in evolution. We further present a tentative timing solution for the millisecond pulsar (MSP) PSR J1803-3002C combining older observations taken with the Parkes 64m radio telescope, Murriyang. This solution implies a relatively young characteristic age of the pulsar in contrast with the old age of the GC. The presence of a slow pulsar and an apparently young MSP, both rare in GCs, suggests that their formation might be linked to the evolutionary stage of the cluster.

AB - We present the results of observations aimed at discovering and studying pulsars in the core-collapsed globular cluster (GC) NGC 6522 performed by the MeerTIME and TRAPUM Large Survey Project with the MeerKAT telescope.We have discovered two new isolated pulsars bringing the total number of known pulsars in the cluster to six. PSR J1803-3002E is a mildly recycled pulsar with a spin period of 17.9 ms, while pulsar PSR J1803-3002F is a slow pulsar with a spin period of 148.1 ms. The presence of isolated and slow pulsars is expected in NGC 6522, and confirms the predictions of previous theories for clusters at this stage in evolution. We further present a tentative timing solution for the millisecond pulsar (MSP) PSR J1803-3002C combining older observations taken with the Parkes 64m radio telescope, Murriyang. This solution implies a relatively young characteristic age of the pulsar in contrast with the old age of the GC. The presence of a slow pulsar and an apparently young MSP, both rare in GCs, suggests that their formation might be linked to the evolutionary stage of the cluster.

KW - globular clusters: individual: NGC6522

KW - pulsars: general

UR - http://www.scopus.com/inward/record.url?scp=85180795279&partnerID=8YFLogxK

U2 - 10.48550/arXiv.2310.03800

DO - 10.48550/arXiv.2310.03800

M3 - Article

AN - SCOPUS:85180795279

VL - 680

JO - Astronomy and astrophysics

JF - Astronomy and astrophysics

SN - 0004-6361

ER -