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 106 to 1011.5 M ⊙ 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()?~?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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机译：为了揭示关于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列（SFMS）的散布。我们分别通过来自银河系中子中子气调查和宽视野红外测量仪的空间分辨Hα和中红外通量组装了355个附近星系的样本。我们研究了各种恒星形成率（SFR）和恒星质量转换对SFMS的影响。恒星质量在106至1011.5 M ang范围内，并且是通过中红外波段的色/质/光比方法得出的，在适用范围和固有系统误差范围内，它们在内部是一致的;恒定的质光比也会产生代表性的恒星质量。各种SFR估计值显示出内在差异，并在SFMS中产生明显的垂直偏移，具体取决于相应示踪剂所包含的时间尺度和物理情况。 SFR估计值在低于500？pc的物理规模上会分解。我们还检查了空间分辨的SFMS中各种散射源，并发现形态学没有扮演重要角色。我们通过单个星系确定了整个SFMS的三个独特轨道，它们由log（）？〜？7.5的临界恒星质量密度描绘。在此规模以下，SFMS没有显示出明显的趋势，并且可能是由本地，随机的内部过程驱动的。超过此比例，所有空间分解的星系都有可比的SFMS斜率，但表现出两种不同的行为，这很可能是由于星系中心的质量增长速率所致。
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