标题： 使用赫歇尔空间天文台对M81、M83和NGC 2403中的尘埃加热进行研究 显示英文标题

标题： Investigations of dust heating in M81, M83, and NGC 2403 with the Herschel Space Observatory

摘要： 我们使用斯皮策空间望远镜和赫歇尔空间天文台的远红外数据，以及地面观测的光学和近红外数据，以了解邻近的正面朝向的螺旋星系M81、M83和NGC 2403中尘埃加热如何受到所有恒星的星光以及恒星形成区域辐射的影响。 我们发现70/160微米表面亮度比更容易受到恒星形成区域的影响。 然而，250/350微米和350/500微米表面亮度比则更受总恒星群体光的影响，这表明>250微米处的尘埃发射主要来自比<160微米处的尘埃更冷的成分，并且相对不受恒星形成活动的影响。 最后，我们讨论了这对建模附近和更遥远星系的光谱能量分布以及利用远红外尘埃发射追踪恒星形成的意义。 显示英文摘要

摘要： We use Spitzer Space Telescope and Herschel Space Observatory far-infrared data along with ground-based optical and near-infrared data to understand how dust heating in the nearby face-on spiral galaxies M81, M83, and NGC 2403 is affected by the starlight from all stars and by the radiation from star forming regions. We find that 70/160 micron surface brightness ratios tend to be more strongly influenced by star forming regions. However, the 250/350 micron and 350/500 micron surface brightness ratios are more strongly affected by the light from the total stellar populations, suggesting that the dust emission at >250 microns originates predominantly from a component that is colder than the dust seen at <160 microns and that is relatively unaffected by star formation activity. We conclude by discussing the implications of this for modelling the spectral energy distributions of both nearby and more distant galaxies and for using far-infrared dust emission to trace star formation.