Interstellar Complex Organic Molecules Towards Outflows From The G351.16+0.70 (NGC 6334 V) Massive Protostellar System

By Keith Cowing
Status Report
March 7, 2023
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Interstellar Complex Organic Molecules Towards Outflows From The G351.16+0.70 (NGC 6334 V) Massive Protostellar System
G351 spectrum with identified iCOMs (labeled) towards the brightest core KDJ4 and their corresponding fit modeling using XCLASS. The Black solid line shows the observed spectrum, the Orange solid line shows the modeled spectrum obtained using XCLASS. In the lower subplot, we show the residuals (𝑒 = πΌπ‘šπ‘œπ‘‘π‘’π‘™ βˆ’ πΌπ‘œπ‘π‘ ). — astro-ph.GA

G351.16+0.70 is a relatively well-studied High Mass Star Forming Region with at least two main bipolar outflow structures originating from an OB embedded star and multiple IR cores.

Using high-resolution and large bandwidth SMA observations, we studied its molecular content to probe the emission of iCOMs which could be related to the bipolar outflows or their jets. We analyzed the emission spectra in the 1mm band within 8 GHz bandwidth coverage, from 216.75 to 220.75 GHz, and from 228.75 to 232.75 GHz. Employing the LTE approximation using the XCLASS software, we identified 260 emission lines arising from iCOMs. The emission lines in the synthetic emission spectra could be explained by 11 iCOMs and 5 molecular isotopologues.

Additionally, we analyzed the outstanding broad iCOM emission lines by using integrated and velocity field maps, searching for extended emission and velocity gradients related to molecular outflows. Ro-vibrational transitions of CH3OH, C2H3CN, CH3OCHO, CH3COCH3, and aGg’-(CH2OH)2 present evidence of extended emission that does not fit with spherical morphology and that follows the path of the low-velocity 13CO outflow.

The multiple outflows in the system are revealed also by the CO (2-1) and SiO (5-4) emission, but in particular we have discovered a so-called extremely high velocity outflow (|VMaxβˆ’VLSR|∼60 km sβˆ’1). Additionally, we provide the full line catalog of iCOMs along the 8 GHz bandwidth produced by the main protostellar core.

Map of the continumm emision towards G351. The red contours show the 1.4 millimeter continuum emission, whereas the green contours show the 870 πœ‡m emission. In both contour maps the first contour starts at 20% of the peak emission with a contour spacing of 10%. The background shows the 3 color mid-IR image from Spitzer. — astro-ph.GA

O. S. Rojas-GarcΓ­a, A. I. GΓ³mez-Ruiz, A. Palau, M. T. Orozco-Aguilera, S. E. Kurtz, M. Chavez Dagostino

Comments: 19 pages, 14 figures, 7 tables
Subjects: Astrophysics of Galaxies (astro-ph.GA); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2303.02527 [astro-ph.GA] (or arXiv:2303.02527v1 [astro-ph.GA] for this version)
Submission history
From: Omar Sergio Rojas GarcΓ­a
[v1] Sat, 4 Mar 2023 23:37:20 UTC (5,565 KB)
Astrobiology, Astrochemistry

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) πŸ––πŸ»