Nobeyama 45-m Mapping Observations toward Orion A. III. Multi-Line Observations toward an Outflow-shocked Region, OMC-2 FIR

Abstract

We present the results of mapping observations toward an outflow-shocked region, OMC-2 FIR 4 using the Nobeyama 45-m telescope. We observed the area in ${}^{13}$CO ($J=1-0$), C${}^{18}$O ($J=1-0$), N${}_2$H${}^{+}$ ($J=1-0$), CCS ($J_N=8_7-7_6$), HCO${}^{+}$ ($J=1-0$), H${}^{13}$CO${}^{+}$ ($J=1-0$), HN${}^{13}$C ($J=1-0$), H${}^{13}$CN ($J=1-0$), DNC ($J=1-0$), N${}_2$D${}^{+}$ ($J=1-0$), and DC${}_3$N ($J=9-8$). We detected a dense molecular clump that contains FIR 4/5. We also detected in ${}^{13}$CO blueshifted and redshifted components driven presumably by protostellar outflows in this region. The axes of the FIR 3 and VLA 13 outflows, projected on the plane of the sky, appear to point toward the FIR 4 clump, suggesting that the clump may be compressed by protostellar outflows from Class I sources, FIR 3 and VLA 13. Applying the hyperfine fit of N${}_2$H${}^{+}$ lines, we estimated the excitation temperature to be $\sim$ 20 K. The high excitation temperature is consistent with the fact that the clump contains protostars. The CCS emission was detected in this region for the first time. Its abundance is estimated to be a few $\times 10^{-12}$, indicating that the region is chemically evolved at $\sim 10^5$ years, which is comparable to the typical lifetime of the Class I protostars. This timescale is consistent with the scenario that star formation in FIR 4 is triggered by dynamical compression of the protostellar outflows. The [HNC]/[HCN] ratio is evaluated to be $\sim 0.5$ in the dense clump and the outflow lobes, whereas it is somewhat larger in the envelope of the dense clump. The small [HNC]/[HCN] ratio indicates that the HNC formation was prevented due to high temperatures. Such high temperatures seem to be consistent with the scenario that either protostellar radiation or outflow compression, or both, affected the thermal properties of this region.

arXiv comment23 pages, 8 figures, PASJ in press

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Cited by in corpus (9)

• Cloud-cloud collision in the DR 21 cloud as a trigger of massive star formation
• Nobeyama 45-m mapping observations toward nearby molecular clouds, Orion A, Aquila Rift, and M17: Project overview
• Cluster formation in the W40 and Serpens South complex triggered by the expanding HII region
• Nobeyama 45 m Mapping Observations toward Orion A. II. Classification of cloud structures and variation of the ${}^{13}$CO/C${}^{18}$O abundance ratio due to far-UV Radiation
• Large-scale molecular gas distribution in the M17 cloud complex: dense gas conditions of massive star formation?
• ALMA Fragmented Source Catalogue in Orion (FraSCO) I. Outflow interaction within an embedded cluster in OMC-2/FIR3, FIR4, and FIR5
• Interaction between Northern Coal Sack in the Cyg OB 7 cloud complex and the multiple super nova remnants including HB 21
• Star Cluster Formation in Orion A
• FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN): Possible evidence of cloud-cloud collisions triggering high-mass star formation in the giant molecular cloud M16 (Eagle Nebula)