研究区域对恒星形成表面密度的影响

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Publications of the Astronomical Society of the Pacific Pub Date : 2023-10-01 DOI:10.1088/1538-3873/acf789
Feng-jie Lei, Hong Wu
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引用次数: 0

摘要

摘要利用H α图像的数据分析了69个低表面亮度星系(LSBGs)和68个恒星形成星系(SF)的全球和H ii区域之间的恒星形成表面密度(Σ SFR)。传统的全球Σ SFR被定义为恒星形成速率(SFR)除以全球星系的面积,由于与SF星系相比,H ii区域的数量较少,因此可能无法准确描述LSBGs中的恒星形成活动。为了解决这个问题,我们将全球星系分为两个区域,H区和弥散区,然后研究每个区域的Σ SFR。我们的研究结果表明,LSBGs中H ii区的SFR和面积都低于SF星系,导致LSBGs中H ii区的Σ SFR (SFR/面积)比SF星系略低0.28个指数,尽管LSBGs的全球Σ SFR至少比SF星系低一个数量级。此外,全球和H ii地区的Σ SFR存在显著差异。在LSBGs中,Σ SFR从全球区到H区增加了0.80个指数,而SF星系则增加了0.54个指数,这突出了仔细选择合适孔径进行Σ SFR计算的关键方面。
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Examining the Influence of the Regions on Star Formation Surface Density
Abstract We analyzed the star formation surface density (Σ SFR ) 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 H α images. The conventional global Σ SFR , 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 Σ SFR 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 Σ SFR (SFR/area) being slightly lower in LSBGs than in SF galaxies by 0.28 dex, although the global Σ SFR 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 Σ SFR . In LSBGs, Σ SFR 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 Σ SFR calculations.
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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