FUV and NIR size of the HI selected low surface brightness galaxies

FUV and NIR size of the HI selected low surface brightness galaxies
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HI选定的低表面亮度星系的FUV和NIR尺寸

DOI:
10.1088/1674-4527/21/3/076
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发表时间:
2020-11
影响因子:
1.8
通讯作者:
Marat Musin
Marat Musin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Cheng Cheng;Wei Du;Cong Kevin Xu;Tian-Wen Cao;Hong-Xin Zhang;Jia-Sheng Huang;Chuan He;Zi-Jian Li;Shu-Mei Wu;Hai Xu;Y. Sophia Dai;Xu Shao;Marat Musin

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抽象的。低表面亮度星系(LSBG)是如何形成恒星和聚集恒星质量的,这是与理解LSBG群体有关的最重要的问题之一。我们选取了381个具有远紫外(FUV)和近红外(NIR)观测的HI明亮LSBG样本来研究恒星形成率(SFR)、恒星质量尺度和生长模式。我们测量了样品的FUV和NIR半径,它们分别代表恒星形成和恒星质量分布的尺度。我们还将FUV和H波段半径-恒星质量关系与档案数据进行了比较,以确定LSBG星系群与其他星系之间的SFR和恒星质量结构的差异。由于星系HI质量与HI半径密切相关,我们还可以通过比较HI和FUV半径来了解HI气体的分布和恒星的形成活动。我们的结果表明,大多数HI选择的LSBG具有扩展的恒星形成结构。LSBG的恒星质量分布可能具有与相同恒星质量箱的盘状星系相似的结构,但LSBG的恒星形成活动发生在比高表面密度星系更大的半径范围内,这可能有助于从宽视场深U波段图像探测中识别LSBG样本。HI也分布在更大的半径上,这意味着LSBG的Kennicutt-Schmidt关系更陡峭(或不陡峭)。
Abstract. How low surface brightness galaxies (LSBGs) form stars and assemble stellar mass is one of the most important questions related to understanding the LSBG population. We select a sample of 381 HI bright LSBGs with both far ultraviolet (FUV) and near infrared (NIR) observations to investigate the star formation rate (SFR) and stellar mass scales, and the growth mode. We measure the FUV and NIR radii of our sample, which represent the star-forming and stellar mass distribution scales respectively. We also compare the FUV and H band radius-stellar mass relation with archival data, to identify the SFR and stellar mass structure difference between the LSBG population and other galaxies. Since galaxy HI mass has a tight correlation with the HI radius, we can also compare the HI and FUV radii to understand the distribution of HI gas and star formation activities. Our results show that most of the HI selected LSBGs have extended star formation structure. The stellar mass distribution of LSBGs may have a similar structure to disk galaxies at the same stellar mass bins, but the star-forming activity of LSBGs happens at a larger radius than the high surface density galaxies, which may help to identify the LSBG sample from the wide-field deep u band image survey. The HI is also distributed at larger radii, implying a steeper (or not) Kennicutt-Schmidt relation for LSBGs.
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