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Herschel-ATLAS:边缘螺旋星系UGC 4754中的尘埃能量平衡

The Herschel-ATLAS: The dust energy balance in the edge-on spiral galaxy UGC 4754

M. Baes, J. Fritz, D. A. Gadotti, D. J. B. Smith, L. Dunne, E. da Cunha, A. Amblard, R. Auld, G. J. Bendo, D. Bonfield, D. Burgarella, S. Buttiglione, A. Cava, … 展开作者

M. Baes, J. Fritz, D. A. Gadotti, D. J. B. Smith, L. Dunne, E. da Cunha, A. Amblard, R. Auld, G. J. Bendo, D. Bonfield, D. Burgarella, S. Buttiglione, A. Cava, D. Clements, A. Cooray, A. Dariush, G. de Zotti, S. Dye, S. Eales, D. Frayer, J. Gonzalez-Nuevo, D. Herranz, E. Ibar, R. Ivison, G. Lagache, L. Leeuw, M. Lopez-Caniego, M. Jarvis, S. Maddox, M. Negrello, M. Michalowski, E. Pascale, M. Pohlen, E. Rigby, G. Rodighiero, S. Samui, S. Serjeant, P. Temi, M. Thompson, P. van der Werf, A. Verma, C. Vlahakis

摘要:

我们使用Herschel PACS和SPIRE观测的边缘螺旋星系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,我们的辐射转移模型低估了所观察到的FIR发射的一个因素的两到三个。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恒星形成,作为一个更可能的解释,贡献不大的光学消光。

英文摘要:

We use Herschel PACS 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.

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