全色哈勃仙女座宝库:三角座扩展区域(PHATTER)。III. M33 中年轻星团的质量函数
The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). III. The Mass Function of Young Star Clusters in M33
AI总结:
本文利用 PHATTER 巡天的 711 个年轻星团测量 M33 星团质量函数,发现其更符合带高质量截断的 Schechter 函数,并验证截断质量与恒星形成率面密度的线性关系。
摘要:
我们测量了本星系群星系 M33 的星团质量函数。我们使用从 Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region(PHATTER,全色哈勃仙女座宝库:三角座扩展区域)巡天中选出的恒星星团目录。我们分析了 M33 中 711 个星团,这些星团由对单颗恒星的颜色—星等图拟合确定,具有 7.0 < log(Age/yr) < 8.5 且 log(M/M⊙) > 3.0。M33 星团质量函数最适合用 Schechter 函数描述,其幂律斜率为 α = -2.06^{+0.14}_{-0.13},截断质量为 log(M_c/M⊙) = 4.24^{+0.16}_{-0.13}。数据显示出高质量截断的有力证据,因此相比纯幂律,强烈支持 Schechter 函数拟合。M33 的截断质量与此前发现的 M_c 和恒星形成率面密度 Σ_SFR 之间的线性趋势一致。我们还探究了单个星团质量不确定性对导出的质量函数参数的影响,并有证据表明,较大的星团质量不确定性有可能在 1σ 水平上使拟合质量函数的截断质量产生偏差。
英文摘要:
We measure the star cluster mass function for the Local Group galaxy M33. We use the catalog of stellar clusters selected from the Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER) survey. We analyze 711 clusters in M33 with $\rm 7.0 < log(Age/yr) < 8.5$, and log($M/M_{\odot}$) $>$ 3.0 as determined from color-magnitude diagram fits to individual stars. The M33 cluster mass function is best described by a Schechter function with power law slope $α= -2.06^{+0.14}_{-0.13}$, and truncation mass log($M_c/M_{\odot}$) $= 4.24^{+0.16}_{-0.13}$. The data show strong evidence for a high-mass truncation, thus strongly favoring a Schechter function fit over a pure power law. M33's truncation mass is consistent with the previously identified linear trend between $M_c$, and star formation rate surface density, \SigSFR. We also explore the effect that individual cluster mass uncertainties have on derived mass function parameters, and find evidence to suggest that large cluster mass uncertainties have the potential to bias the truncation mass of fitted mass functions on the one sigma level.
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