{"title":"Neutral hydrogen absorption in the nucleus of NGC3079","authors":"A. Pedlar , C.G. Mundell , J.F. Gallimore , S.A. Baum , C.P. O'Dea","doi":"10.1016/0083-6656(95)00108-5","DOIUrl":null,"url":null,"abstract":"<div><p>We present subarcsecond MERLIN 21cm neutral hydrogen absorption line measurements of a 4 × 3 arcseconds (300 × 200 pc) region associated with the active nucleus of the Sc galaxy NGC3079. Broad (200–400 km s<sup>−1</sup>) and deep (τ ∼ 0.5–1) absorption is seen over much of the region, corresponding to column densities as high as 3 × 10<sup>22</sup> atoms cm<sup>−2</sup>. The absorption shows a velocity gradient which could be consistent with rotation about a central mass of ∼ 10<sup>9</sup> <em>M</em><sub>⊙</sub>, however significant non-circular motions are also present which may be due to gas motions in a non-axisymetric potential.</p></div>","PeriodicalId":101275,"journal":{"name":"Vistas in Astronomy","volume":"40 1","pages":"Pages 91-95"},"PeriodicalIF":0.0000,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0083-6656(95)00108-5","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Vistas in Astronomy","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0083665695001085","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 9
Abstract
We present subarcsecond MERLIN 21cm neutral hydrogen absorption line measurements of a 4 × 3 arcseconds (300 × 200 pc) region associated with the active nucleus of the Sc galaxy NGC3079. Broad (200–400 km s−1) and deep (τ ∼ 0.5–1) absorption is seen over much of the region, corresponding to column densities as high as 3 × 1022 atoms cm−2. The absorption shows a velocity gradient which could be consistent with rotation about a central mass of ∼ 109M⊙, however significant non-circular motions are also present which may be due to gas motions in a non-axisymetric potential.
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