天文学进展Issue(4)：525-533,9.DOI:10.3969/j.issn.1000-8349.2014.04.07
棒对旋涡星系中央恒星形成的作用
The Effects of Bar Sturcture on the Central sSFR of Spiral Galaxies
摘要
Abstract
We investigate the effects of bars in spiral galaxies on galaxy central specific Star Formation Rate (sSFR) using a sample of over 9000 spiral galaxies drawn from Sloan Digital Sky Survey, with morphological classifications assigned by visual inspection. Our sample includes three types: none-barred galaxies and galaxies hosting long or short bars, respectively. By identifying star-forming and quiescent population, we find barred spiral galaxies tend to be central quiescent. However, the star-forming barred spiral galaxies tend to have stronger central star forming activities than the unbarred spiral galaxies. In order to find the connection between central sSFR and the presence of a bar within the spiral galaxy, we construct control samples where barred and unbarred ones are closely matched by stellar mass. We then find the same proportion of central quiescent galaxies for barred and unbarred ones. Furthermore, the star-forming barred ones still have stronger central star forming activities than the unbarred ones with the signal mainly coming from the long barred ones. These results demonstrate that bars may have no influence on central star quiescence, but bars can induce the central star formation in their host spiral galaxies where the effect are mainly contributed by long bars.关键词
棒旋星系/星系中央/比恒星形成率Key words
barred galaxies/galaxy central/sSFR分类
天文与地球科学引用本文复制引用
林野..棒对旋涡星系中央恒星形成的作用[J].天文学进展,2014,(4):525-533,9.基金项目
国家自然科学基金(11173045,11233005,10878001,11033006,11121062) （11173045,11233005,10878001,11033006,11121062）
