Discovery and timing of ten new millisecond pulsars in the globular cluster Terzan 5

被引：8

作者：

Padmanabh, P. V. ^{[1
,2
,3
]}

Ransom, S. M. ^{[4
]}

Freire, P. C. C. ^{[3
]}

Ridolfi, A. ^{[3
,5
]}

Taylor, J. D. ^{[6
,7
]}

Choza, C. ^{[4
,8
]}

Clark, C. J. ^{[1
,2
]}

Abbate, F. ^{[3
,5
]}

Bailes, M. ^{[9
]}

Barr, E. D. ^{[3
]}

Buchner, S. ^{[10
]}

Burgay, M. ^{[5
]}

DeCesar, M. E. ^{[11
]}

Chen, W. ^{[3
]}

Corongiu, A. ^{[5
]}

Champion, D. J. ^{[3
]}

Dutta, A. ^{[3
]}

Geyer, M. ^{[10
,12
]}

Hessels, J. W. T. ^{[13
,14
]}

Kramer, M. ^{[3
,15
]}

Possenti, A. ^{[5
]}

Stairs, I. H. ^{[16
]}

Stappers, B. W. ^{[15
]}

Krishnan, V. Venkatraman ^{[3
]}

Vleeschower, L. ^{[15
]}

Zhang, L. ^{[9
,17
]}

机构：

[1] Max Planck Inst Grav Phys, Albert Einstein Inst, D-30167 Hannover, Germany

[2] Leibniz Univ Hannover, D-30167 Hannover, Germany

[3] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany

[4] Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA

[5] INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy

[6] West Virginia Univ, Dept Phys & Astron, POB 6315, Morgantown, WV 26506 USA

[7] West Virginia Univ, Ctr Gravitat Waves & Cosmol, Chestnut Ridge Res Bldg, Morgantown, WV 26505 USA

[8] SETI Inst, 339 Bernardo Ave,Suite 200, Mountain View, CA 94043 USA

[9] Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia

[10] South African Radio Astron Observ, 2 Fir St,Black River Pk, ZA-7925 Observatory, South Africa

[11] George Mason Univ, Fairfax, VA 22030 USA

[12] Univ Cape Town, Dept Math & Appl Math, High Energy Phys Cosmol & Astrophys Theory HEPCAT, ZA-7701 Rondebosch, South Africa

[13] Univ Amsterdam, Anton Pannekoek Inst Astron, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[14] Netherlands Inst Radio Astron, ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands

[15] Univ Manchester, Jodrell Bank Ctr Astrophys, Dept Phys & Astron, Manchester M13 9PL, England

[16] Univ British Columbia, Dept Phys & Astron, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada

[17] Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100101, Peoples R China

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 686卷

基金：

欧洲研究理事会; 中国国家自然科学基金; 美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

binaries: general; pulsars: general; globular clusters: individual: Terzan 5; X-RAY BINARIES; LONG-TERM OBSERVATIONS; RADIO PULSARS; 47; TUCANAE; GENERAL-RELATIVITY; MAVERIC SURVEY; SHAPIRO DELAY; BLACK-HOLE; MASS; POPULATION;

D O I：

10.1051/0004-6361/202449303

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of ten new pulsars in the globular cluster Terzan 5 as part of the Transients and Pulsars with MeerKAT (TRAPUM) Large Survey Project. We observed Terzan 5 at L-band (856-1712 MHz) with the MeerKAT radio telescope for four hours on two epochs, and performed acceleration searches of 45 out of 288 tied-array beams covering the core of the cluster. We obtained phase-connected timing solutions for all ten discoveries, covering nearly two decades of archival observations from the Green Bank Telescope for all but one. Highlights include PSR J1748-2446ao which is an eccentric (e = 0.32) wide-orbit (orbital period P-b = 57.55 d) system. We were able to measure the rate of advance of periastron ( omega ) for this system allowing us to determine a total mass of 3.17 +/- 0.02 M-circle dot. With a minimum companion mass (M-c) of similar to 0.8 M-circle dot, PSR J1748-2446ao is a candidate double neutron star (DNS) system. If confirmed to be a DNS, it would be the fastest spinning pulsar (P = 2.27 ms) and the longest orbital period measured for any known DNS system. PSR J1748-2446ap has the second highest eccentricity for any recycled pulsar (e similar to 0.905) and for this system we can measure the total mass (1.997 +/- 0.006 M-circle dot) and estimate the pulsar and companion masses, ( 1.700(-0.045)(+0.015 )M(circle dot) and 0.294 ( +0.046)(-0.014) M-circle dot,M- respectively). PSR J1748-2446ar is an eclipsing redback (minimum M-c similar to 0.34 M-circle dot) system whose properties confirm it to be the counterpart to a previously published source identified in radio and X-ray imaging. We were also able to detect omega for PSR J1748-2446au leading to a total mass estimate of 1.82 +/- 0.07 M-circle dot and indicating that the system is likely the result of Case A Roche lobe overflow. With these discoveries, the total number of confirmed pulsars in Terzan 5 is 49, the highest for any globular cluster so far. These discoveries further enhance the rich set of pulsars known in Terzan 5 and provide scope for a deeper understanding of binary stellar evolution, cluster dynamics and ensemble population studies.

引用

页数：23