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Explaining high braking indices of magnetars SGR 0501+4516 and 1E 2259+586 using the double magnetic-dipole model 期刊论文 OAI收割
ASTRONOMISCHE NACHRICHTEN, 2021, 卷号: 342, 期号: 1-2, 页码: 7
作者: Yan, Fang-Zhou; Gao, Zhi-Fu; Yang, Wen-Shen; Dong, Ai-Jun

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收藏 | 浏览/下载：24/0 | 提交时间：2021/04/01

1E 2259+586 double magnetic-dipole model magnetar braking index SGR 0501+4516

The Remnant of Neutron Star-White Dwarf Merger and the Repeating Fast Radio Bursts 期刊论文 OAI收割
International Journal of Astronomy and Astrophysics, 2020, 卷号: 10, 期号: 1, 页码: 28-38
作者: Liu, Xiang

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收藏 | 浏览/下载：14/0 | 提交时间：2021/06/25

Pulsar Neutron Star White Dwarf Merger Magnetic Field Magnetar Fast Radio Burst

No pulsed radio emission during a bursting phase of a Galactic magnetar 期刊论文 OAI收割
Nature, 2020, 卷号: 587, 页码: 63-65
作者: HXMT

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Astrophysics - High Energy Astrophysical Phenomena Abstract: Fast radio bursts (FRBs) are millisecond-duration radio transients of unknown physical origin observed at extragalactic distances^1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources^4-13, but no convincing evidence has been collected so far¹⁴. Recently, the Galactic magnetar SRG 1935+2154 entered an active phase by emitting intense soft íray bursts¹⁵. One FRB-like event with two peaks (FRB 200428) and a luminosity slightly lower than the faintest extragalactic FRBs was detected from the source, in association with a soft íray/hard-X-ray flare^18-21. Here we report an eight-hour targeted radio observational campaign comprising four sessions and assisted by multi-wavelength (optical and hard-X-ray) data. During the third session, 29 soft-íray repeater (SGR) bursts were detected in íray energies. Throughout the observing period, we detected no single dispersed pulsed emission coincident with the arrivals of SGR bursts, but unfortunately we were not observing when the FRB was detected. The non-detection places a fluence upper limit that is eight orders of magnitude lower than the fluence of FRB 200428. Our results suggest that FRB-SGR burst associations are rare. FRBs may be highly relativistic and geometrically beamed, or FRB-like events associated with SGR bursts may have narrow spectra and characteristic frequencies outside the observed band. It is also possible that the physical conditions required to achieve coherent radiation in SGR bursts are difficult to satisfy, and that only under extreme conditions could an FRB be associated with an SGR burst.

Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文 OAI收割
The Astrophysical Journal, 2020, 卷号: 901, 页码: L7
作者: HXMT

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Radio transient sources Magnetars Soft gamma-ray repeaters 2008 992 1471 Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Instrumentation and Methods for Astrophysics Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of A_J = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 10¹⁴ Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to R_NIR ? 0.025 (fluence index ?0.35).

GRB 200415A: A Short Gamma-Ray Burst from a Magnetar Giant Flare? 期刊论文 OAI收割
The Astrophysical Journal, 2020, 卷号: 899, 页码: 106
作者: HXMT

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Gamma-ray bursts Soft gamma-ray repeaters Magnetars Gamma-ray transient sources 629 1441 992 1853 Astrophysics - High Energy Astrophysical Phenomena Abstract: The giant flares of soft gamma-ray repeaters (SGRs) have long been proposed to contribute to at least a subsample of the observed short gamma-ray bursts (GRBs). In this paper, we perform a comprehensive analysis of the high-energy data of the recent bright short GRB 200415A, which was located close to the Sculptor galaxy. Our results suggest that a magnetar giant flare provides the most natural explanation for most observational properties of GRB 200415A, including its location, temporal and spectral features, energy, statistical correlations, and high-energy emissions. On the other hand, the compact star merger GRB model is found to have difficulty reproducing such an event in a nearby distance. Future detections and follow-up observations of similar events are essential to firmly establish the connection between SGR giant flares and a subsample of nearby short GRBs.

A magnetically driven origin for the low luminosity GRB 170817A associated with GW170817 期刊论文 OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2018, 卷号: 18, 期号: 6
作者: Tong Hao; Yu Cong; Huang Lei

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收藏 | 浏览/下载：16/0 | 提交时间：2021/12/06

GAMMA-RAY BURSTS MAGNETIZED NEUTRON-STARS GIANT FLARES ENERGY SGR-1806-20 SCATTERING REPEATERS MECHANISM COMPTON PULSARS stars: magnetar stars: neutron gamma-ray bursts: individual (GRB 170817A) gravitational waves

Pulsar braking: magnetodipole vs. wind 期刊论文 OAI收割
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2016, 卷号: 59, 期号: 1, 页码: 619501
作者: Tong, Hao

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magnetar magnetic field neutron star pulsar wind

A note on the puzzling spindown behavior of the Galactic center magnetar SGR J1745-2900 期刊论文 OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2015, 卷号: 15, 期号: 9, 页码: 1467-1474
作者: Tong, Hao

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pulsars: individual (SGR J1745-2900) stars: magnetar stars: neutron stars: winds

Two predictions for the spin down behavior of magnetar SGR J1745-2900 会议论文 OAI收割
KIAA at Peking University, Beijing, China, Oct. 20-22, 2014
作者: Tong, Hao

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收藏 | 浏览/下载：17/0 | 提交时间：2017/10/23

Pulsars Individual: (Sgr J1745−2900) Stars: Magnetar Wind

Two types of glitches in a solid quark star model 期刊论文 OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 卷号: 443, 期号: 3, 页码: 2705-2710
作者: Zhou, E. P.; Lu, J. G.; Tong, H.; Xu, R. X.

收藏 | 浏览/下载：24/0 | 提交时间：2015/06/09

dense matter stars: magnetar stars: neutron pulsars: general