No nitrogen fractionation on 600 au scale in the Sun progenitor analogue OMC–2 FIR4

摘要: We show the first interferometric maps of 14N/15N ratio obtained with Atacama Large Millimeter Array (ALMA) towards Solar-like forming protocluster OMC-2 FIR4. observed N2H+, 15NNH+, N15NH+ (1-0), and N2D+ (2-1), from which we derive isotopic ratios D/H. The target is one closest analogues environment in our Sun may have formed. ALMA images, having synthesised beam corresponding to ~600 au, that emission less abundant isotopologues distributed several cores ~10" (i.e. ~0.02~pc or 4000 au) embedded a more extended N2H+ emission. Overall, results indicate that: (1) does not change across region at core scales, (2) depend on temperature variations. Our findings also suggest variations found pristine Solar System objects are likely inherited stage, hence their reason has be elsewhere.