{"title":"FG3: Spatial and frequency modeling of circumstellar masers","authors":"F. Colomer , K.M. Menten , M.J. Reid","doi":"10.1016/S0083-6656(97)00002-0","DOIUrl":null,"url":null,"abstract":"<div><p>We have developed a computer program (called “FG3”) that is useful to model images of spectral line emission. We have applied it successfully to the study of maser emission in the circumstellar envelopes of late-type stars. The program will search for maser sources, blended spatially and in frequency, and fit 3D Gaussians to them. This is, to our knowledge, a new approach in these kind of investigations. This program provides information of the source structure distribution and kinematics, and also measures parameters that are directly related with the physical conditions in the masing regions. In particular, the measurement of the maser spectral linewidths contains information of the degree of saturation of these masers. We discuss our results of the study of water masers at 22 GHz with the VLA.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"41 2","pages":"Pages 179-183"},"PeriodicalIF":0.0000,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0083-6656(97)00002-0","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Vistas in Astronomy","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0083665697000020","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
We have developed a computer program (called “FG3”) that is useful to model images of spectral line emission. We have applied it successfully to the study of maser emission in the circumstellar envelopes of late-type stars. The program will search for maser sources, blended spatially and in frequency, and fit 3D Gaussians to them. This is, to our knowledge, a new approach in these kind of investigations. This program provides information of the source structure distribution and kinematics, and also measures parameters that are directly related with the physical conditions in the masing regions. In particular, the measurement of the maser spectral linewidths contains information of the degree of saturation of these masers. We discuss our results of the study of water masers at 22 GHz with the VLA.
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