独特的轨道驱动空间分辨的恒星形成主序列的分散
Unique Tracks Drive the Scatter of the Spatially-Resolved Star Formation Main Sequence
摘要：
为了揭示星系形成和演化过程的特征，研究了空间分辨恒星形成主序星（SFMS）的散射。我们收集了355个邻近星系的样本，它们分别来自Galerkin电离中性气体巡天和宽视场红外巡天探测器，具有空间分辨的Hα和中红外通量。我们研究了各种恒星形成率（SFR）和恒星质量转换的SFMS的影响。恒星质量的范围从10^6到10^11.5 M_sun，并由中红外波段的色质光比方法得出，在其适用范围和固有系统误差内，恒星质量是内部一致的;恒定的质光比也产生代表性的恒星质量。各种SFR估计显示内在的差异，并在SFMS中产生明显的垂直移动，这取决于相应示踪剂所包含的时间尺度和物理特性。SFR估计似乎在低于500 pc的物理规模上崩溃。我们还研究了空间分辨SFMS中的各种散射源，发现形态学并没有发挥重要作用。我们确定了三个独特的轨道通过SFMS的个别星系，划定了一个临界恒星质量密度的log（M_M*）~7.5。在这个尺度下，SFMS没有显示出明显的趋势，可能是由局部的随机内部过程驱动的。在这个尺度以上，所有空间分辨的星系都有类似的SFMS斜率，但表现出两种不同的行为，这可能是由于星系中心的质量吸积速率。
英文摘要：
The scatter of the spatially resolved star formation main sequence (SFMS) is investigated in order to reveal signatures about the processes of galaxy formation and evolution. We have assembled a sample of 355 nearby galaxies with spatially resolved Hα and mid-infrared fluxes from the Survey for Ionized Neutral Gas in Galaxies and the Wide-field Infrared Survey Explorer, respectively. We examine the impact of various star formation rate (SFR) and stellar mass transformations on the SFMS. Ranging from 10^6 to 10^11.5 M_sun and derived from color to mass-to-light ratio methods for mid-infrared bands, the stellar masses are internally consistent within their range of applicability and inherent systematic errors; a constant mass-to-light ratio also yields representative stellar masses. The various SFR estimates show intrinsic differences and produce noticeable vertical shifts in the SFMS, depending on the timescales and physics encompassed by the corresponding tracer. SFR estimates appear to break down on physical scales below 500 pc. We also examine the various sources of scatter in the spatially resolved SFMS and find morphology does not play a significant role. We identify three unique tracks across the SFMS by individual galaxies, delineated by a critical stellar mass density of log (Σ_M*)~7.5. Below this scale, the SFMS shows no clear trend and is likely driven by local, stochastic internal processes. Above this scale, all spatially resolved galaxies have comparable SFMS slopes but exhibit two different behaviors, resulting likely from the rate of mass accretion at the center of the galaxy.
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