| Name: | Amal George Cheriyan |
| Affiliation: | Indian Institute of Space Science and Technology |
| Conference ID : | ASI2024_647 |
| Title : | Discovery of jet lobes at parsec scale from East-West protostellar jet associated with RAFGL2591 using GMRT. |
| Authors : | A. G. Cheriyan1, S. Vig1, Sreelekshmi Mohan1 |
| Authors Affiliation: | 1 Indian Institute of Space Science and Technology |
| Mode of Presentation: | Poster |
| Abstract Category : | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract : | We investigate the low-frequency radio emission from the protostellar jet associated with the massive star-forming region RAFGL2591 using the Giant Metrewave Radio Telescope (GMRT) at 325, 610, and 1280 MHz. The star-forming complex consists of a cluster of young stellar objects and embedded protostars at a distance of 3.33 kpc. For the first time, we have detected radio jet lobes in the east–west direction, labelled as GMRT-1 and GMRT-2. The jet lobes are unique in the sense that while GMRT-1 exhibits a flat spectral index of α = −0.10, GMRT-2 displays a negative value of α = −0.62, suggesting non-thermal emission. Utilising the molecular hydrogen emission maps at 2.12 μm, we infer the presence of bow-shaped arcs, inner shocks and knots towards the jet lobes excited by the central protostar VLA 3. The radio lobes (GMRT-1 and GMRT-2) and H_2 emission towards this region are understood in the context of the prominent east–west jet as well as its lesser-known sibling jet in the north-east and south-west direction. In order to constrain the physical parameters of the jet lobes, we have employed a numerical model which includes both thermal and non-thermal emission and found number densities in the range 100–1000 cm^(−3) and mass loss rate to be 5 × 10^(−4) Msun yr^(−1). The east–west jet lobes manifest a misalignment having reflection symmetry with a bending of ∼20◦. We attempt to understand this misalignment through the combined effect of the precession caused by a binary partner and a supersonic sidewind from one of the nearby VLA exciting sources.
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