论文标题
星系和质量组装（GAMA）：恒星形成对低红移星系中表面亮度的依赖性
Galaxy And Mass Assembly (GAMA): The Dependence of Star Formation on Surface Brightness in Low Redshift Galaxies
论文作者
论文摘要
星系中的恒星形成速率众所周知，与恒星质量（“恒星形成主序列”）相关。在这里，我们将其进一步扩展，以探索对星系表面亮度的任何其他依赖，这是恒星质量表面密度的代理。我们使用了GAMA调查中的大量低红移（$ Z \ leq 0.08 $）星系，该样品既具有SED衍生的恒星形成速率和光度凸起 - 盘分解，后者提供了圆盘表面亮度和椎间盘质量的度量。使用两个样品，一个由单个组件拟合的一个星系，其sérsic索引低于2，一个来自两个分量拟合的盘，我们发现，一旦考虑到恒星形成速率的总体质量依赖性，则在任何样品中都没有任何证据来进一步依赖恒星表面密度。
The star formation rate in galaxies is well known to correlate with stellar mass (the `star-forming main sequence'). Here we extend this further to explore any additional dependence on galaxy surface brightness, a proxy for stellar mass surface density. We use a large sample of low redshift ($z \leq 0.08$) galaxies from the GAMA survey which have both SED derived star formation rates and photometric bulge-disc decompositions, the latter providing measures of disc surface brightness and disc masses. Using two samples, one of galaxies fitted by a single component with Sérsic index below 2 and one of the discs from two-component fits, we find that once the overall mass dependence of star formation rate is accounted for, there is no evidence in either sample for a further dependence on stellar surface density.
