Galaxy And Mass Assembly (GAMA): The Merging Potential of Brightest Group Galaxies
Galaxy And Mass Assembly (GAMA): The Merging Potential of Brightest Group Galaxies
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DOI：
10.3847/1538-4357/ac1c0a
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
K. Banks;S. Brough;B. Holwerda;A. Hopkins;Á. López-Sánchez;S. Phillipps;K. Pimbblet;A. Robotham
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文献类型：
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作者：
K. Banks;S. Brough;B. Holwerda;A. Hopkins;Á. López-Sánchez;S. Phillipps;K. Pimbblet;A. Robotham
利用银河系和质量装配星系群星表中的550个星系群的有限体积样本，研究了中心最亮星系群(BGGS)的合并潜力。我们使用光谱确认的近伴星系作为低红移BGGS，z≤0.2中潜在恒星质量积累的指示。我们确定了17个亲密伴星系，它们的投影间隔Rp<；30kpc，相对速度Δv≤300kM S−1，恒星质量比M BGG/M CC≤4相对于BGG。这些亲密伴星系的总配对比例为0.03±0.01。总体而言，我们发现我们样本中的BGG由于合并而有可能增加恒星质量2.2±1.5%GYR−1。这低于目前星系演化模型所预测的恒星质量增长。
Using a volume-limited sample of 550 groups from the Galaxy And Mass Assembly Galaxy Group Catalogue spanning the halo mass range 12.8<log[Mh/M⊙]<14.2 , we investigate the merging potential of central Brightest Group Galaxies (BGGs). We use spectroscopically confirmed close-companion galaxies as an indication of the potential stellar mass buildup of low-redshift BGGs, z ≤ 0.2. We identify 17 close-companion galaxies with projected separations r p < 30 kpc, relative velocities Δv ≤ 300 km s−1, and stellar mass ratios M BGG/M CC ≤ 4 relative to the BGG. These close-companion galaxies yield a total pair fraction of 0.03 ± 0.01. Overall, we find that BGGs in our sample have the potential to grow in stellar mass due to mergers by 2.2 ± 1.5% Gyr−1. This is lower than the stellar mass growth predicted by current galaxy evolution models.