发布求助
文献互助 智能选刊 最新文献

Astronomical and Astrophysical Transactions最新文献

筛选
英文 中文
Cosmology with gamma-ray bursts 伽玛射线暴的宇宙学
Astronomical and Astrophysical Transactions Pub Date : 2009-08-10 DOI: 10.17184/eac.7526
L. Amati
{"title":"Cosmology with gamma-ray bursts","authors":"L. Amati","doi":"10.17184/eac.7526","DOIUrl":"https://doi.org/10.17184/eac.7526","url":null,"abstract":"Gamma-ray bursts constitute one of the most fascinating and relevant phenomena in modern science, \u0000with strong implications for several fields of astrophysics, cosmology and fundamental physics. \u0000In this short review, I focus on the prospective key-role of GRBs for cosmology. Indeed, the huge \u0000luminosity, the redshift distribution extending at least up to $zsim10$ and the association with \u0000the explosive death of very massive stars make long GRBs (i.e., those lasting up to a few \u0000minutes) potentially extremely powerful probes for shedding light on main open issues in our \u0000understanding of the early Universe: star formation rate evolution up to the first generation of \u0000stars (pop-III), cosmic reionization, luminosity function and metallicity evolution of \u0000primordial galaxies up to the ``cosmic dawn\". At the same time, interesting correlations between \u0000luminosity/radiated energy and spectral photon peak energy are the subject of intensive \u0000investigations for ``standardizing\" GRBs and using them for measuring cosmological parameters, \u0000investigating the nature and evolution of ``dark energy\" and testing non-standard cosmological \u0000models. I will also report on the status, concepts and expected performances of space mission \u0000projects aiming at fully exploiting these potentialities of the GRB phenomenon, thus \u0000providing an ideal sinergy with the large e.m. facilities of the future like LSST, ELT, TMT, SKA, \u0000CTA, ATHENA.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"95 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2009-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80978747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Interplanetary scintillation using EISCAT and MERLIN: extremely long baselines at multiple frequencies 使用EISCAT和MERLIN的行星际闪烁:在多个频率上非常长的基线
Astronomical and Astrophysical Transactions Pub Date : 2007-12-13 DOI: 10.1080/10556790701612197
R. Fallows, A. Breen, M. Bisi, R. Jones, G. Dorrian
{"title":"Interplanetary scintillation using EISCAT and MERLIN: extremely long baselines at multiple frequencies","authors":"R. Fallows, A. Breen, M. Bisi, R. Jones, G. Dorrian","doi":"10.1080/10556790701612197","DOIUrl":"https://doi.org/10.1080/10556790701612197","url":null,"abstract":"Improvements to two of the radio telescopes of European Incoherent SCATter radar (EISCAT) allow measurements of Interplanetary Scintillation (IPS) at 1.4 GHz, and this has prompted two major developments in studies of IPS. Simultaneous observations between EISCAT and MERLIN allow baselines of up to 2000 km, significantly improving velocity resolution and making possible much greater accuracy in determining the direction of flow than previously, as well as demonstrating that density variations in the slow solar wind remain partially correlated for at least 8 s. Initial results suggest two fast solar wind modes, and there is evidence for super-radial (meridional) expansion of the fast solar wind. Trials have been conducted using different observing frequencies at different sites, including the use of the EISCAT Svalbard Radar for IPS for the first time. Observations at 500, 928 and 1420 MHz with baselines of up to 1200 km have been carried out. The results are found to be consistent between single- and dual...","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"156 1","pages":"489-500"},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90141073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The dedicated interferometer for rapid variability 专用干涉仪快速变异性
Astronomical and Astrophysical Transactions Pub Date : 2007-12-13 DOI: 10.1080/10556790701610498
B. Dennison, C. Bennett, M. Blake, M. Brown, A. T. Castelaz, M. Castelaz, W. Christiansen, J. D. Cline, J. Daugherty, D. Hutchinson, C. Kaltreider, E. Kirbach, D. Moffett, C. Osborne, L. Owen, K. Vorren
{"title":"The dedicated interferometer for rapid variability","authors":"B. Dennison, C. Bennett, M. Blake, M. Brown, A. T. Castelaz, M. Castelaz, W. Christiansen, J. D. Cline, J. Daugherty, D. Hutchinson, C. Kaltreider, E. Kirbach, D. Moffett, C. Osborne, L. Owen, K. Vorren","doi":"10.1080/10556790701610498","DOIUrl":"https://doi.org/10.1080/10556790701610498","url":null,"abstract":"A project is underway to develop a two-element interferometer for dedicated monitoring of compact radio sources. The primary goal will involve long-term, fully-sampled monitoring of a large population of extragalactic sources to study interstellar scintillation and search for extreme scattering events. The interferometer will make use of two existing 26-metre antennas with an east-west separation of about 400 metres at the Pisgah Astronomical Research Institute, in partnership with the Pisgah Astronomical Research and Science Education Centre, an interinstitutional centre of the University of North Carolina system.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"6 1","pages":"557-565"},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89358987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interstellar scintillation: observational highlights 星际闪烁:观测亮点
Astronomical and Astrophysical Transactions Pub Date : 2007-12-13 DOI: 10.1080/10556790701600580
B. Rickett
{"title":"Interstellar scintillation: observational highlights","authors":"B. Rickett","doi":"10.1080/10556790701600580","DOIUrl":"https://doi.org/10.1080/10556790701600580","url":null,"abstract":"This paper reviews the chief observational phenomena that define interstellar scintillation (ISS) and have given evidence for a widespread distribution of plasma turbulence on very small scales. Though ISS was discovered in pulsars and is still a major perturbation of their signals, it is now also recognized in a variety of fluctuations in the flux density from quasars and Active Galactic Nuclei (AGNs).","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"4 1","pages":"429-439"},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74954697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Monitoring of interplanetary and ionosphere scintillations at frequency 110 MHz 110兆赫频率的行星际和电离层闪烁监测
Astronomical and Astrophysical Transactions Pub Date : 2007-12-13 DOI: 10.1080/10556790701610381
V. Shishov, S. Tyul'Bashev, I. Subaev, I. Chashei
{"title":"Monitoring of interplanetary and ionosphere scintillations at frequency 110 MHz","authors":"V. Shishov, S. Tyul'Bashev, I. Subaev, I. Chashei","doi":"10.1080/10556790701610381","DOIUrl":"https://doi.org/10.1080/10556790701610381","url":null,"abstract":"Abstract Large Phased Array of the P.N. Lebedev Physical Institute is the most sensitive in the world at the metre waveband. It allows simultaneous observation of two independent diagrams each consisting of 16 beams. We are planning to introduce a program of monitoring interplanetary and ionospheric scintillation using observations of radio sources by one multi-beam diagram. The methods of observations and data reduction are discussed. We present the first results of seven day test observations for a strip of the sky in a region with declinations between 28° and 32° by using an eight-beam diagram.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"36 1","pages":"677-681"},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87041756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Diagnostics of solar wind streams 太阳风的诊断
Astronomical and Astrophysical Transactions Pub Date : 2007-12-13 DOI: 10.1080/10556790701610449
N. Lotova, K. Vladimirskii, V. Obridko
{"title":"Diagnostics of solar wind streams","authors":"N. Lotova, K. Vladimirskii, V. Obridko","doi":"10.1080/10556790701610449","DOIUrl":"https://doi.org/10.1080/10556790701610449","url":null,"abstract":"Up-to-date methods of investigation of solar wind generation are applied to study the types of the streams that form the inhomogeneous jet structure of circumsolar plasma. The particularities of this structure are analysed at the maximum and transition to the declining phase of cycle 23.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"3 1","pages":"501-505"},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78238410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Interstellar turbulent plasma spectrum from multi-frequency pulsar observations 来自多频脉冲星观测的星际湍流等离子体光谱
Astronomical and Astrophysical Transactions Pub Date : 2007-12-13 DOI: 10.1080/10556790701600549
T. Smirnova
{"title":"Interstellar turbulent plasma spectrum from multi-frequency pulsar observations","authors":"T. Smirnova","doi":"10.1080/10556790701600549","DOIUrl":"https://doi.org/10.1080/10556790701600549","url":null,"abstract":"Abstract We present here our recent results concerning the shape of interstellar plasma spectrum of five pulsars: PSR 0329 + 54, 0437 − 47, 0809 + 74, 0950 + 08 and 1642 − 03 based on complex analysis of multi-frequency observations of diffractive and refractive scintillation of pulsars. We found that in particular directions, the spectrum differs from the Kolmogorov one. Strong angular refraction was detected in the direction to PSR 0329 + 54, 0437 − 47 and 0950 + 08.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"13 1","pages":"535-540"},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78400490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Observations and Levy statistics in interstellar scattering 星际散射中的观测和Levy统计
Astronomical and Astrophysical Transactions Pub Date : 2007-12-13 DOI: 10.1080/10556790701610506
C. Gwinn
{"title":"Observations and Levy statistics in interstellar scattering","authors":"C. Gwinn","doi":"10.1080/10556790701610506","DOIUrl":"https://doi.org/10.1080/10556790701610506","url":null,"abstract":"Levy flights are similar to random walks, but are dominated by rare, large events rather than the accumulation of many steps. Levy flights are not subject to the Central Limit Theorem because the distribution of steps has no second moment; they converge to Levy-stable distributions, which have power-law tails and are stable in form under convolution with themselves. A variety of physical models can produce Levy flights. For such models, the distribution of differences in refractive index has no convergent moments, so that propagation of waves through such a medium is difficult to treat with traditional theoretical methods. Calculations show that Levy flights may help to understand some surprising aspects of radio-wave scattering in the interstellar plasma, including the scaling of broadening time τ with dispersion measure DM, the shape of scatter-broadened images, and the impulse-response function for temporal broadening of narrow pulses.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"20 1","pages":"525-533"},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86868604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The dual-frequency calibration of ionosphere influence in VLBA data processing VLBA数据处理中电离层影响的双频定标
Astronomical and Astrophysical Transactions Pub Date : 2007-12-13 DOI: 10.1080/10556790701610373
A. Chuprikov
{"title":"The dual-frequency calibration of ionosphere influence in VLBA data processing","authors":"A. Chuprikov","doi":"10.1080/10556790701610373","DOIUrl":"https://doi.org/10.1080/10556790701610373","url":null,"abstract":"Some results of processing data of Very Long Baseline Array (VLBA) experiments titled RDV14, RDV15, RDV16, and RDV17 are presented. Observations had been carried out on 15/04/1999, 10/05/1999, 21/06/1999, and 02/08/1999. The Flexible Image Transport System (FITS) files have been created with a VLBA correlator and then placed into archive. Later, these data have been kindly placed at my disposal by Dr. Leonid Petrov (Goddard Space Centre). The software project titled “Astro Space Locator” (ASL for Windows) has been used for post-correlation data processing.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"398 1","pages":"671-674"},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78088850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Subdiffusion of beams through interplanetary and interstellar media 光束通过星际和星际介质的亚扩散
Astronomical and Astrophysical Transactions Pub Date : 2007-12-13 DOI: 10.1080/10556790701600242
A. Stanislavsky
{"title":"Subdiffusion of beams through interplanetary and interstellar media","authors":"A. Stanislavsky","doi":"10.1080/10556790701600242","DOIUrl":"https://doi.org/10.1080/10556790701600242","url":null,"abstract":"The angular distribution of beams being propagated through a medium with random inhomogeneities is analysed. The peculiarity of this medium is that beams are trapped at random locations and random times because of wave localisation in the inhomogeneities. The mean-square deviation of the beam from its initial direction is calculated. The application of this method to the diagnostics of interplanetary and interstellar turbulent media is discussed.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"150 1","pages":"655-658"},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77382317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信