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浏览/检索结果: 共78条，第1-10条 帮助 限定条件 专题：高能物理研究所    第一署名单位    第一作者单位    通讯作者单位     条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择提交时间升序提交时间降序发表日期升序发表日期降序题名升序题名降序作者升序作者降序 Flare quasi-periodic pulsation associated with recurrent jets 期刊论文  OAI收割 FRONTIERS IN ASTRONOMY AND SPACE SCIENCES, 2022, 卷号: 9, 页码: 1032099 作者:  Li, Dong;  Shi, Fanpeng;  Zhao, Haisheng;  Xiong, Shaolin;  Song, Liming   |  收藏  |  浏览/下载：3/0  |  提交时间：2023/11/10 Sun: flares  Sun: oscillations  Sun: UV emission  Sun: X-ray emission  Sun: radio emission  MHD waves   Unravelling the nature of the dual AGN in the galaxy pair system IRAS 05589+2828 and 2MASX J06021107 + 2828382 期刊论文  OAI收割 Monthly Notices of the Royal Astronomical Society, 2022, 卷号: 516, 期号: 4, 页码: 5270 作者:  Benítez, E.;  Jiménez-Bailón, E.;  Negrete, C. A.;  Ruschel-Dutra, D.;  Rodríguez-Espinosa, J. M.   |  收藏  |  浏览/下载：5/0  |  提交时间：2023/11/10 galaxies: active  galaxies: evolution  quasars: emission lines  quasars: individual: IRAS 05589+2828  2MASX J06021107 + 2828382  galaxies: Seyfert  Astrophysics - Astrophysics of Galaxies   Experiments on a Conduction Cooled Superconducting Radio Frequency Cavity with Field Emission Cathode 会议论文  OAI收割 USA, 2022 作者:  Y. Ji;  R. Dhuley;  C.J. Edwards;  J.C.T. Thangaraj   |  收藏  |  浏览/下载：2/0  |  提交时间：2023/01/05 Multiwavelength Observations of Fast Radio Bursts 期刊论文  OAI收割 Universe, 2021, 卷号: 7, 页码: 76 作者:  Nicastro, Luciano;  Guidorzi, Cristiano;  Palazzi, Eliana;  Zampieri, Luca;  Turatto, Massimo   |  收藏  |  浏览/下载：6/0  |  提交时间：2021/11/18 Detection of two bright radio bursts from magnetar SGR 1935 + 2154 期刊论文  OAI收割 Nature Astronomy, 2021, 卷号: 5, 页码: 414 作者:  Kirsten, F.;  Snelders, M. P.;  Jenkins, M.;  Nimmo, K.;  van den Eijnden, J.   |  收藏  |  浏览/下载：10/0  |  提交时间：2021/11/18 A Variable Ionized Disk Wind in the Black Hole Candidate EXO 1846-031 期刊论文  OAI收割 The Astrophysical Journal, 2021, 卷号: 906, 页码: 11 作者:  Wang, Yanan;  Ji, Long;  García, Javier A.;  Dauser, Thomas;  Méndez, Mariano   |  收藏  |  浏览/下载：26/0  |  提交时间：2021/11/18 Detection of Flare Multiperiodic Pulsations in Mid-ultraviolet Balmer Continuum, Lyl Hard X-Ray, and Radio Emissions Simultaneously 期刊论文  OAI收割 The Astrophysical Journal, 2021, 卷号: 921, 页码: 179 作者:  HXMT   |  收藏  |  浏览/下载：16/0  |  提交时间：2022/02/08 Solar flares  Solar oscillations  Solar ultraviolet emission  Solar  x-ray emission  Solar radio emission  1496  1515  1533  1536  1522  Astrophysics - Solar and Stellar Astrophysics  Abstract: Quasi-periodic pulsations (QPPs), which usually appear as temporal pulsations of the total flux, are frequently detected in the light curves of solar/stellar flares. In this study, we present the investigation of nonstationary QPPs with multiple periods during the impulsive phase of a powerful flare on 2017 September 6, which were simultaneously measured by the Hard X-ray Modulation Telescope (Insight-HXMT), as well as the ground-based BLENSW. The multiple periods, detected by applying a wavelet transform and Lomb-Scargle periodogram to the detrended light curves, are found to be ~20-55 s in the Ly`and mid-ultraviolet Balmer continuum emissions during the flare impulsive phase. Similar QPPs with multiple periods are also found in the hard X-ray emission and low-frequency radio emission. Our observations suggest that the flare QPPs could be related to nonthermal electrons accelerated by the repeated energy release process, i.e., triggering of repetitive magnetic reconnection, while the multiple periods might be modulated by the sausage oscillation of hot plasma loops. For the multiperiodic pulsations, other generation mechanisms could not be completely ruled out.   The Luminosity Distribution of Short Gamma-Ray Bursts under a Structured Jet Scenario 期刊论文  OAI收割 The Astrophysical Journal, 2020, 卷号: 894, 期号: 1, 页码: 11 作者:  Guo, Qi;  Wei, Daming;  Wang, Yuanzhu   |  收藏  |  浏览/下载：18/0  |  提交时间：2020/10/19 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   |  收藏  |  浏览/下载：37/0  |  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 distances1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources4-13, 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 flare18-21. 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   |  收藏  |  浏览/下载：16/0  |  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).