中国科学院机构知识库网格系统: 检索

A New Solar Hard X-ray Image Reconstruction Algorithm for ASO-S/HXI Based on Deep Learning 期刊论文 OAI收割
SOLAR PHYSICS, 2024, 卷号: 299, 期号: 11
作者: Xia, Yuehan; Su, Yang; Liu H(刘辉); Yu, Wenhui; Li, Zhentong

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收藏 | 浏览/下载：9/0 | 提交时间：2024/11/25

X-ray bursts Solar flares Machine learning Hard X-ray imaging

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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收藏 | 浏览/下载：46/0 | 提交时间：2022/02/08

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.

Introducing a special collection of papers in the Journal of High Energy Astrophysics on the Early Results of China's 1st X-ray Astronomy Satellite: Insight-HXMT 期刊论文 OAI收割
Journal of High Energy Astrophysics, 2020, 卷号: 27, 页码: 51-52
作者: HXMT

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收藏 | 浏览/下载：52/0 | 提交时间：2022/02/08

Astrophysics - High Energy Astrophysical Phenomena Abstract: Insight-HXMT is the first Chinese X-ray astronomical mission, launched successfully on June 15, 2017, from China's Jiuquan Satellite Launch Center. Insight-HXMT was designed to have a broad energy coverage in X-rays, from 1-250 keV, with excellent timing and adequate energy resolution at soft X-rays, and the largest effective area at hard X-rays. This allows, in particular, to observe bright sources like X-ray binaries (XRBs) in their bright/outburst states with high cadence and high statistics at hard and soft X-rays at once. It was then expected that the Insight-HXMT mission will bring us new insights regarding the characteristics of several source classes. Examples include characterizing High-Mass X-ray Binaries (HMXBs) and the outburst evolution of Low-Mass X-ray Binaries (LMXBs). For instance, in HMXB systems, the region around their Alfven radius that is responsible to determine whether accretion or propeller occurs, or the region around the NS magnetic pole where the intense X-rays are supposed to be produced are specially appealing targets of study. For the LMXBs, the evolution the outburst and the properties of the compact objects themselves are obvious priority targets for Insight-HXMT. Due to the broad coverage in energy, Insight-HXMT is specially well suited to study the influence of thermonuclear (type-I) X-ray bursts upon the surrounding environment.

Instrument performance and simulation verification of the polar detector 期刊论文 iSwitch采集
Nuclear instruments & methods in physics research section a-accelerators spectrometers detectors and associated equipment, 2017, 卷号: 872, 页码: 28-40
作者: Kole, M.; Li, Z. H.

收藏 | 浏览/下载：60/0 | 提交时间：2019/04/23

Hard x-rays Gamma-ray bursts Polarization Calibration s Imulation Geant4

Instrument performance and simulation verification of the POLAR detector 期刊论文 OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2017, 卷号: 872, 页码: 28-40
作者: Zhang, J; Kole, M; Li ZH(李正恒); Zhang J(张娟); Bao TW(鲍天威)

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收藏 | 浏览/下载：62/0 | 提交时间：2019/08/27

Hard X-rays Gamma-Ray Bursts Polarization Calibration S imulation Geant4

Bi-directional flows in a C-class solar flare 期刊论文 OAI收割
ASTROPHYSICS AND SPACE SCIENCE, 2016, 卷号: 361, 期号: 1
作者: Ning, Zongjun

收藏 | 浏览/下载：24/0 | 提交时间：2016/09/27

Sun Flares and Sun UV radiation and Sun X-ray bursts Hard

Bi-directional flows in a C-class solar flare 期刊论文 OAI收割
ASTROPHYSICS AND SPACE SCIENCE, 2016, 卷号: 361, 期号: 1
作者: Ning, Zongjun

收藏 | 浏览/下载：24/0 | 提交时间：2016/09/27

Sun Flares and Sun UV radiation and Sun X-ray bursts Hard

X-ray source motion along the loop in two solar flares 期刊论文 OAI收割
ASTROPHYSICS AND SPACE SCIENCE, 2013, 卷号: 346, 期号: 2, 页码: 307-318
作者: Ning, Zongjun

收藏 | 浏览/下载：17/0 | 提交时间：2014/01/08

Sun: flares Sun: X-ray Bursts, Hard

Radiative and conductive cooling in a solar flare 期刊论文 OAI收割
ASTROPHYSICS AND SPACE SCIENCE, 2012, 卷号: 338, 期号: 1, 页码: 15-21
作者: Ning, Zongjun; Li, Dong

收藏 | 浏览/下载：19/0 | 提交时间：2013/01/31

Sun: flares Sun: X-ray bursts Hard

Speed Distributions of Merging X-Ray Sources During Chromospheric Evaporation in Solar Flares 期刊论文 OAI收割
SOLAR PHYSICS, 2011, 卷号: 273, 期号: 1, 页码: 81-92
作者: Ning, Zongjun

收藏 | 浏览/下载：15/0 | 提交时间：2012/08/07

Flares X-ray bursts, hard