Vistas in Astronomy最新文献

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The radio-jet X-ray binaries 射电喷流x射线双星
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(96)00054-2
R.P. Fender , S.J.Bell Burnell , E.B. Waltman
{"title":"The radio-jet X-ray binaries","authors":"R.P. Fender ,&nbsp;S.J.Bell Burnell ,&nbsp;E.B. Waltman","doi":"10.1016/S0083-6656(96)00054-2","DOIUrl":"10.1016/S0083-6656(96)00054-2","url":null,"abstract":"<div><p>We review the observational properties, from radio to X-rays, of the eight systems for which there is strong evidence for the formation of a radio jet in a X-ray binary system.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 1","pages":"Pages 3-13"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(96)00054-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84636330","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: 21
Future prospects of the upgraded EVN 升级后的EVN的未来展望
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(97)00024-X
R.T. Schilizzi
{"title":"Future prospects of the upgraded EVN","authors":"R.T. Schilizzi","doi":"10.1016/S0083-6656(97)00024-X","DOIUrl":"10.1016/S0083-6656(97)00024-X","url":null,"abstract":"<div><p>The EVN is currently in the midst of an ambitious upgrade programme. The hardware and software developments in progress are briefly summarized, and changes in operational practice and user support are also described.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 2","pages":"Pages 303-305"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(97)00024-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90679025","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
Relativistic jets from galactic sources 来自星系源的相对论性喷流
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(96)00053-0
R.E. Spencer , S.J. Newell
{"title":"Relativistic jets from galactic sources","authors":"R.E. Spencer ,&nbsp;S.J. Newell","doi":"10.1016/S0083-6656(96)00053-0","DOIUrl":"10.1016/S0083-6656(96)00053-0","url":null,"abstract":"","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 1","pages":"Page 1"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(96)00053-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75137355","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: 4
The S2 VLBI system S2 VLBI系统
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(97)00023-8
W.H. Cannon , D. Baer , G. Feil , B. Feir , P. Newby , A. Novikov , P. Dewdney , B. Carlson , W.T. Petrachenko , J. Popelar , P. Mathieu , R.D. Wietfeldt
{"title":"The S2 VLBI system","authors":"W.H. Cannon ,&nbsp;D. Baer ,&nbsp;G. Feil ,&nbsp;B. Feir ,&nbsp;P. Newby ,&nbsp;A. Novikov ,&nbsp;P. Dewdney ,&nbsp;B. Carlson ,&nbsp;W.T. Petrachenko ,&nbsp;J. Popelar ,&nbsp;P. Mathieu ,&nbsp;R.D. Wietfeldt","doi":"10.1016/S0083-6656(97)00023-8","DOIUrl":"10.1016/S0083-6656(97)00023-8","url":null,"abstract":"<div><p>The S2 VLBI system is described in some detail, including the S2 data acquisition system, data recorder and playback terminals, and the correlator.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 2","pages":"Pages 297-302"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(97)00023-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73425359","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: 31
EVN observations with the MkIV system MkIV系统的EVN观测
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(97)00025-1
H.J. Van Langevelde
{"title":"EVN observations with the MkIV system","authors":"H.J. Van Langevelde","doi":"10.1016/S0083-6656(97)00025-1","DOIUrl":"10.1016/S0083-6656(97)00025-1","url":null,"abstract":"<div><p>Around the EVN telescopes are being upgraded to the MkIV recording system. This enables flexible observing modes and higher recording bandwidth than the existing VLBI recording systems. As of this year (1997) some of these observing modes can be scheduled on the EVN. To make full use of the capabilities, the EVN/JIVE MkIV correlator is being built in Dwingeloo. The capabilities of the full system, as well as the situation during the transition period are discussed.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 2","pages":"Pages 307-310"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(97)00025-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91470213","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
List of participants 参会人员名单
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(97)90112-4
{"title":"List of participants","authors":"","doi":"10.1016/S0083-6656(97)90112-4","DOIUrl":"https://doi.org/10.1016/S0083-6656(97)90112-4","url":null,"abstract":"","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 2","pages":"Pages 323-326"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(97)90112-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138342069","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
Statistical classification 统计分类
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(97)00045-7
Josef Kittler
{"title":"Statistical classification","authors":"Josef Kittler","doi":"10.1016/S0083-6656(97)00045-7","DOIUrl":"https://doi.org/10.1016/S0083-6656(97)00045-7","url":null,"abstract":"<div><p>Statistical pattern classification methodology is overviewed. The recent developments in classifier combination are reviewed.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 3","pages":"Pages 405-410"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(97)00045-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138216403","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
Multi-epoch VLBA 15 and 43 GHz observations of the gravitational lens PKS 1830-211: Extending VLBI towards the micro-arcsecond scale 引力透镜PKS 1830-211的多历元VLBA 15和43 GHz观测:将VLBI扩展到微弧秒尺度
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(97)00020-2
M.A. Garrett , S. Nair , R.W. Porcas , A.R. Patnaik
{"title":"Multi-epoch VLBA 15 and 43 GHz observations of the gravitational lens PKS 1830-211: Extending VLBI towards the micro-arcsecond scale","authors":"M.A. Garrett ,&nbsp;S. Nair ,&nbsp;R.W. Porcas ,&nbsp;A.R. Patnaik","doi":"10.1016/S0083-6656(97)00020-2","DOIUrl":"10.1016/S0083-6656(97)00020-2","url":null,"abstract":"<div><p>We present multi-epoch, VLBA maps of PKS 1830-211 at 15 and 43 GHz. The 43 GHz observations reveal complicated submilliarcsecond radio structure in the cores of both lensed images. This structure appears to change dramatically between the two epochs (separated by 44 days). One explanation for these unusually rapid structural changes is that the lens magnifies each image, such that the nominal submilliarcsecond scale of these maps is enhanced by a factor of between 5 and 10—effectively boosting our resolution towards the micro-arcsecond scale.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 2","pages":"Pages 281-285"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(97)00020-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86781275","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: 16
The decay phase of radio flares from GRS1915+105 GRS1915+105射电耀斑的衰减阶段
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(96)00057-8
T. Canosa , R.P. Fender , G.G. Pooley
{"title":"The decay phase of radio flares from GRS1915+105","authors":"T. Canosa ,&nbsp;R.P. Fender ,&nbsp;G.G. Pooley","doi":"10.1016/S0083-6656(96)00057-8","DOIUrl":"10.1016/S0083-6656(96)00057-8","url":null,"abstract":"<div><p>Decays of radio flares from the superluminal galactic source GRS1915+105 are analysed and both exponential and power law decays are fitted to the data. It is found that the exponential law is a marginally better approximation, whereas an expanding plasmon model actually predicts a power law type decay. The reason for this is due to relativistic aberration, time dilation and the Doppler effect, in going from the rest frame of the ejecta to the observer's frame. This effect is relevant for telescopes in which the beamwidth encompasses both approaching and receding plasmons, e.g. the radio monitoring programs at GBI and the Ryle Telescope.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 1","pages":"Pages 21-26"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(96)00057-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86817904","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
Signatures of helical jets 螺旋射流的特征
Vistas in Astronomy Pub Date : 1997-01-01 DOI: 10.1016/S0083-6656(96)00065-7
W. Steffen
{"title":"Signatures of helical jets","authors":"W. Steffen","doi":"10.1016/S0083-6656(96)00065-7","DOIUrl":"10.1016/S0083-6656(96)00065-7","url":null,"abstract":"<div><p>Observational signatures of helical jets can be found in some X-ray binaries (XRB), planetary nebulae, Herbig-Haro objects and in jets of active galactic nuclei (AGN). For example, in the XRB SS433 a kinematic model of precessing jets has been applied very successfully and yielded a determination of its distance which is independent of conventional methods. In galactic jets precession appears to be the predominant mechanism for the production of observed helical signatures. In extra-galactic jets other mechanisms seem to be similarly frequent. As a result of their strong dependence on the direction of motion with respect to the observer, special relativistic effects can be pronounced in helical jets. These have to be taken into account in AGN-jets and the newly discovered galactic sources which show apparent superluminal motion. Since the galactic superluminal jets are located in a binary system, jet precession is very likely in these sources. In this paper I review the main structural and kinematic signatures of helical jets and briefly mention the physical mechanisms behind them. I will present kinematic simulations of relativistic jets which are helically bent or have an internal helical flow field.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 1","pages":"Pages 71-78"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(96)00065-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79700620","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: 7
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