局部恒星形成星系在M * = 1010 M⊙附近最活跃地聚集中心质量

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Pub Date : 2023-11-01 DOI:10.3847/1538-4357/ad0230
Zhizheng Pan, Xianzhong Zheng, Xu Kong
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摘要

为了了解恒星形成星系(sfg)在何种质量状态下最积极地建立中心质量浓度,我们利用斯隆数字巡天数据版17中的MaNGA Pipe3D数据,对~ 3600低红移sfg的光度加权恒星年龄径向梯度(∇age)分布进行了研究。平均年龄梯度为负,∇age = - 0.14 log Gyr/ R e,符合由内而外的磁盘形成情景。具体来说,负年龄的SFGs在log (M * / M⊙)<下占~ 28%;9.5,而这个分数在log (M * / M⊙)= 10附近上升到峰值(~ 40%),然后在log (M * / M⊙)= 11时下降到~ 15%。在固定的M *下,年龄为正的SFGs通常比它们的同类具有更紧凑的尺寸和更集中的恒星形成,表明最近的中心质量积聚事件。这些结果表明,在局部SFGs中,中心恒星质量浓度的积累主要活跃在M * = 10 10 M⊙附近。我们的发现为低质量和高质量SFGs之间形态差异的起源提供了新的见解。
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Local Star-forming Galaxies Build Up Central Mass Concentration Most Actively near M = 1010 M
Abstract To understand in what mass regime star-forming galaxies (SFGs) build up central mass concentration most actively, we present a study on the luminosity-weighted stellar age radial gradient (∇ age ) distribution of ∼3600 low-redshift SFGs using the MaNGA Pipe3D data available in Data Release 17 from the Sloan Digital Sky Survey. The mean age gradient is negative, with ∇ age = −0.14 log Gyr/ R e , consistent with the inside-out disk formation scenario. Specifically, SFGs with positive ∇ age consist of ∼28% at log ( M * / M ⊙ ) < 9.5, while this fraction rises up to its peak (∼40%) near log ( M * / M ⊙ ) = 10 and then decreases to ∼15% at log ( M * / M ⊙ ) = 11. At fixed M * , SFGs with positive ∇ age typically have more compact sizes and more centrally concentrated star formation than their counterparts, indicative of recent central mass buildup events. These results suggest that the buildup of central stellar mass concentration in local SFGs is mostly active near M * = 10 10 M ⊙ . Our findings provide new insights into the origin of morphological differences between low-mass and high-mass SFGs.
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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