Herschel -ATLAS: The dust energy balance in the edge-on spiral galaxy UGC 4754
Herschel -ATLAS: The dust energy balance in the edge-on spiral galaxy UGC 4754
复制标题
赫歇尔 -ATLAS：边缘螺旋星系中的尘埃能量平衡 UGC 4754
DOI：
10.1051/0004-6361/201014644
复制
发表时间：
2010
影响因子：
6.5
通讯作者：
Baes M
中科院分区：
文献类型：
--
作者：
Baes M
我们利用HerschelPACS和SPIRE观测的边缘上的螺旋星系UGC 4754，采取的H-ATLAS SDP观测的一部分，调查在这个星系的尘埃能量平衡。我们建立了详细的SKIRT辐射模型的基础上SDSS和UKIDSS地图，并使用这些模型来预测远红外辐射。我们发现，我们的辐射传输模型低估了所观察到的FIR发射的两到三个因素。根据IRAS、ISO和SCUBA的数据，在其他边缘螺旋星系中也发现了类似的差异。由于SED在FIR波长处的良好采样，我们可以排除FIR发射率被低估的原因。相反，我们支持高度模糊的星星的形成，有助于作为一个更可能的解释消光。
We useHerschelPACS and SPIRE observations of the edge-on spiral galaxy UGC 4754, taken as part of the H-ATLAS SDP observations, to investigate the dust energy balance in this galaxy. We build detailed SKIRT radiative models based on SDSS and UKIDSS maps and use these models to predict the far-infrared emission. We find that our radiative transfer model underestimates the observed FIR emission by a factor of two to three. Similar discrepancies have been found for other edge-on spiral galaxies based on IRAS, ISO, and SCUBA data. Thanks to the good sampling of the SED at FIR wavelengths, we can rule out an underestimation of the FIR emissivity as the cause for this discrepancy. Instead we support highly obscured star formation that contributes little to the optical extinction as a more probable explanation.