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On the different levels of dust attenuation to nebular and stellar light in star-forming galaxies

机译：在恒星形成星系中对斑纹和恒星光的不同水平衰减

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As a science verification study of the newly released AKARI/FIS Faint Source Catalog ver. 1, this paper discusses the different levels of dust attenuation toward stellar light and nebular emission lines within local star-forming galaxies at 0.02 < z < 0.10. By constructing an updated version of the AKARI-SDSS-GALEX matched galaxy catalog (with >2000 sources), we compare the dust attenuation levels toward stellar light (from the L-IR/L-UV ratio) and nebular emission lines (from the H alpha/H beta ratio). We find that there is a clear trend that more massive galaxies tend to have higher "extra" attenuation toward nebular regions, while galaxies with higher specific star formation rates tend to have lower extra attenuation. We also confirm these trends by using the WISE mid-infrared photometry with a significantly large sample size of the WISE-SDSS-GALEX galaxies (>50000 sources). Finally, we study how the levels of extra attenuation toward nebular regions change across the SFR-M-* plane. We find that, even at a fixed stellar mass, galaxies located below the main sequence tend to have higher levels of extra attenuation toward nebular regions, suggesting a change in dust geometry within the galaxies across the star-forming main sequence during the course of the star formation quenching process.
机译：作为新发布的Akari / FIS微弱源目录Ver的科学验证研究。如图1所示，本文讨论了0.02 2000源），我们将灰尘衰减水平与恒星光（来自L-IR / L-UV比率）进行比较（来自L-IR / L-UV比率）（来自H alpha / h beta比率）。我们发现存在明显的趋势，更巨大的星系往往朝着内脏区域的“额外”衰减，而具有更高特异性星形形成率的星系往往具有较低的衰减。我们还通过使用明智的中红外测光测定明显大的样本量（> 50000来源）来确认这些趋势。最后，我们研究如何在SFR-M- *平面上改变骨头区域的额外衰减程度。我们发现，即使在固定的恒星群体，位于主要序列下方的星系也往往对骨笼区域具有更高水平的额外衰减，这表明在过程中横跨星系的星系内的灰尘几何形状的变化星形成淬火过程。

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