Dust Attenuation Curve for Local Subgalactic Star-forming Regions
Dust Attenuation Curve for Local Subgalactic Star-forming Regions
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DOI：
10.3847/1538-4357/ab7f27
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发表时间：
2020-03
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影响因子：
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通讯作者：
Berzaf Berhane Teklu;Zesen Lin;X. Kong;E. Wang;Yulong Gao;Qing Liu;N. Hu;Haiyang Liu
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作者：
Berzaf Berhane Teklu;Zesen Lin;X. Kong;E. Wang;Yulong Gao;Qing Liu;N. Hu;Haiyang Liu
我们从阿帕奇角天文台（MaNGA）测绘邻近星系中收集了约157，000个spaxel样本，以推导出本地恒星形成星系（SFG）的亚星系恒星形成区域的平均尘埃衰减曲线。在光学波长，按照Calzetti等人的方法，我们得到了1.1 ≤ Dn（4000）< 1.3的Spaxels的独立平均衰减曲线，这类似于从本地星爆或正常SFG导出的一个。我们检查是否以及如何的形状的平均衰减曲线的变化与几个本地和全球的物理性质。对于1.2 ≤ Dn（4000）< 1.3的spaxels，我们发现平均衰减曲线的形状不依赖于局部或全局物理性质。而对于年轻星族（1.1 ≤ Dn（4000）< 1.2）的Spaxels，在恒星质量面密度较小、星星形成速率面密度较小或位于星系外围的恒星形成区，平均衰减曲线较浅。这些结果强调了使用单一衰减曲线来校正所有类型恒星形成区的尘埃红化的风险，特别是对于那些具有相当年轻的恒星群体的区域。
We compile a sample of about 157,000 spaxels from the Mapping Nearby Galaxies at the Apache Point Observatory (MaNGA) survey to derive the average dust attenuation curve for subgalactic star-forming regions of local star-forming galaxies (SFGs) in the optical wavelength, following the method of Calzetti et al. We obtain a -independent average attenuation curve for spaxels with 1.1 ≤ Dn(4000) < 1.3, which is similar to the one derived from either local starbursts or normal SFGs. We examine whether and how the shape of the average attenuation curve changes with several local and global physical properties. For spaxels with 1.2 ≤ Dn(4000) < 1.3, we find no dependence on either local or global physical properties for the shape of the average attenuation curve. However, for spaxels with younger stellar population (1.1 ≤ Dn(4000) < 1.2), shallower average attenuation curves are found for star-forming regions with smaller stellar mass surface density, smaller star formation rate surface density, or those residing in the outer region of galaxies. These results emphasize the risk of using one single attenuation curve to correct the dust reddening for all type of star-forming regions, especially for those with fairly young stellar population.