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浏览/检索结果: 共86条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Charge-exchange soft X-ray emission of highly charged ions with inclusion of multiple-electron capture 期刊论文  OAI收割 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2021, 卷号: 508, 期号: 2, 页码: 2194-2203 作者:  Liang, G. Y.;  Zhu, X. L.;  Wei, H. G.;  Yuan, D. W.;  Zhong, J. Y.   |  收藏  |  浏览/下载：45/0  |  提交时间：2022/01/07 atomic processes  line: formation  X-rays: general   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   |  收藏  |  浏览/下载：24/0  |  提交时间：2022/02/08 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 AJ = 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 RNIR ? 0.025 (fluence index ?0.35).   Comparison of simulated backgrounds with in-orbit observations for HE, ME, and LE onboard Insight-HXMT 期刊论文  OAI收割 Astrophysics and Space Science, 2020, 卷号: 365, 页码: 158 作者:  HXMT   |  收藏  |  浏览/下载：49/0  |  提交时间：2022/02/08 Insight-HXMT  Geant4 simulation  Background observation  Astrophysics  - Instrumentation and Methods for Astrophysics  Abstract: Insight-HXMT, the first X-ray astronomical satellite in China, aims to reveal new sources in the Galaxy and to study fundamental physics of X-ray binaries from 1 to 250 keV. It has three collimated telescopes, the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME), and the Low Energy X-ray telescope (LE). Before the launch, in-orbit backgrounds of these three telescopes had been estimated through Geant4 simulation, in order to investigate the instrument performance and the achievement of scientific goals. In this work, these simulated backgrounds are compared with in-orbit observations. Good agreements are shown for all three telescopes. For HE, (1) the deviation of the simulated background rate after two years of operation in space is 5 % from the observation  (2) the total background spectrum and the relative abundance of the 67 keV line show long-term increases both in simulations and observations. For ME, (1) the deviation of simulated background rate is within 15 % from the observation, and (2) there are no obvious long-term increase features in the background spectra of simulations and observations. For LE, the background level given by simulations is also consistent with observations. The consistencies of these comparisons validate that the Insight-HXMT mass model, i.e., space environment components and models adopted, physics processes selected, and detector constructions built, is reasonable. However, the line features at 7.5 and 8.0 keV, which are obvious in the observed spectra of LE, are not evident in simulations. This might result from uncertainties in the LE constructions.   Relativistic Fe K alpha line in the composite X-ray spectra of radio-loud active galactic nuclei 期刊论文  OAI收割 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 卷号: 488, 期号: 3, 页码: 4378-4388 作者:  Hu, Jingwei;  Liu, Zhu;  Jin, Chichuan;  Yuan, Weimin   |  收藏  |  浏览/下载：20/0  |  提交时间：2020/03/10 line: profiles  galaxies: active  galaxies: jets  X-rays: galaxies   Constant cyclotron line energy in Hercules X-1 - Joint Insight-HXMT and NuSTAR observations 期刊论文  OAI收割 Journal of High Energy Astrophysics, 2019, 卷号: 23, 页码: 29-32 作者:  HXMT   |  收藏  |  浏览/下载：50/0  |  提交时间：2022/02/08 Stars: neutron star  Pulsars: binary(Her X-1)  X-rays: stars  Astrophysics - High Energy Astrophysical Phenomena  Abstract: The long-term evolution of the centroid energy of the CRSF in Her X-1 is still a mystery. We report a new measurement from a campaign between Insight-HXMT and NuSTAR performed in February 2018. Generally, the two satellites show well consistent results of timing and spectral properties. The joint spectral analysis confirms that the previously observed long decay phase has ended, and that the line energy instead keeps constant around 37.5 keV after flux correction.   Non-damping oscillations at flaring loops 期刊论文  OAI收割 ASTRONOMY & ASTROPHYSICS, 2018, 卷号: 617, 页码: 9 作者:  Li, D.;  Yuan, D.;  Su, Y. N.;  Zhang, Q. M.;  Su, W.   |  收藏  |  浏览/下载：46/0  |  提交时间：2019/04/08 Sun: flares  Sun: oscillations  Sun: UV radiation  Sun: X-rays, gamma rays  line: profiles  techniques: spectroscopic   Non-damping oscillations at flaring loops 期刊论文  OAI收割 ASTRONOMY & ASTROPHYSICS, 2018, 卷号: 617, 页码: 9 作者:  Li, D.;  Yuan, D.;  Su, Y. N.;  Zhang, Q. M.;  Su, W.   |  收藏  |  浏览/下载：8/0  |  提交时间：2020/03/10 Sun: flares  Sun: oscillations  Sun: UV radiation  Sun: X-rays, gamma rays  line: profiles  techniques: spectroscopic   SMSS J130522.47-293113.0: a high-latitude stellar X-ray source with pc-scale outflow relics? 期刊论文  OAI收割 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2018, 卷号: 477, 期号: 1, 页码: 766-779 作者:  Da Costa, G. S.;  Soria, R.;  Farrell, S. A.;  Bayliss, D.;  Bessell, M. S.   |  收藏  |  浏览/下载：29/0  |  提交时间：2020/03/10 stars: activity  stars: emission-line, Be  stars: jets  novae, cataclysmic variables  X-rays: binaries   Observations of Electron-driven Evaporation in a Flare Precursor 期刊论文  OAI收割 ASTROPHYSICAL JOURNAL, 2018, 卷号: 854, 期号: 1, 页码: 10 作者:  Li, Dong;  Li, Ying;  Su, Wei;  Huang, Yu;  Ning, Zongjun   |  收藏  |  浏览/下载：26/0  |  提交时间：2019/04/08 line: profiles  Sun: flares  Sun: radio radiation  Sun: UV radiation  Sun: X-rays  gamma rays  techniques: spectroscopic   Observations of Electron-driven Evaporation in a Flare Precursor 期刊论文  OAI收割 ASTROPHYSICAL JOURNAL, 2018, 卷号: 854, 期号: 1, 页码: 10 作者:  Li, Dong;  Li, Ying;  Su, Wei;  Huang, Yu;  Ning, Zongjun   |  收藏  |  浏览/下载：10/0  |  提交时间：2020/03/11 line: profiles  Sun: flares  Sun: radio radiation  Sun: UV radiation  Sun: X-rays  gamma rays  techniques: spectroscopic