Examining the Influence of the Regions on Star Formation Surface Density
Examining the Influence of the Regions on Star Formation Surface Density
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DOI：
10.1088/1538-3873/acf789
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发表时间：
2023-10
影响因子：
3.5
通讯作者：
F. Lei;Hong Wu
中科院分区：
文献类型：
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作者：
F. Lei;Hong Wu
我们利用HΣ图像数据分析了69个低表面亮度星系(LSBG)和68个恒星形成(SF)星系的全球区和H II区之间的恒星形成面密度(αSFR)。传统的全球LSBG Sfr定义为恒星形成率除以全球星系面积，由于与SF星系相比，H II区的数量较少，因此可能不能准确地描述Σ中的恒星形成活动。为了解决这一问题，我们将全球星系分为两个区域，H II区和弥散区，然后研究每个区域的ΣSFR。我们的结果表明，LSBG中HⅡ区的SFR和面积都低于SF星系，导致LSBG中H II区的ΣSFR(SFR/面积)比SF星系略低0.28度，尽管LSBG中的全球ΣSFR至少比SF星系低一个数量级。此外，Σsfr的全局区和HⅡ区之间存在显著差异。在LSBG中，从全球区域到H II区域，ΣSFR增加了0.80Dex，而SF星系则增加了0.54Dex，这突显了仔细选择适当的口径来计算ΣSFR的关键方面。
We analyzed the star formation surface density (ΣSFR) between the global and H ii regions in a sample of 69 low surface brightness galaxies (LSBGs) and 68 star-forming (SF) galaxies using data from the Hα images. The conventional global ΣSFR, which is defined as the star formation rate (SFR) divided by the area of the global galaxy, may not accurately describe the star formation activity in LSBGs due to the lower number of H ii regions compared to SF galaxies. To address this, we divide the global galaxy into two regions, the H ii region and the diffuse region, and then study the ΣSFR in each region. Our results show that both the SFR and area of the H ii regions in LSBGs are lower than those in SF galaxies, resulting in the H ii region’s ΣSFR (SFR/area) being slightly lower in LSBGs than in SF galaxies by 0.28 dex, although the global ΣSFR is at least an order of magnitude lower in LSBGs than in SF galaxies. Furthermore, a significant difference exists between the global and H ii regions in ΣSFR. In LSBGs, ΣSFR increased by 0.80 dex from the global region to the H ii region, while SF galaxies demonstrate a 0.54 dex increase, highlighting the crucial aspect of carefully selecting an appropriate aperture for ΣSFR calculations.