| Name: | SAURAV SEN |
| Affiliation: | TATA INSTITUTE OF FUNDAMENTAL RESEARCH MUMBAI |
| Conference ID : | ASI2024_407 |
| Title : | Kinematical study of high-mass star formation in Hub-Filament systems |
| Authors : | Saurav Sen, Bhaswati Mookerjea, Rolf Guesten, C. H. Ishwara Chandra |
| Authors Affiliation: | 1. Tata Institute of Fundamental Research, Mumbai.
2. Tata Institute of Fundamental Research, Mumbai.
3. Max Planck Institute for Radio Astronomy, Bonn.
4. National Centre For Radio Astrophysics, TIFR, Pune. |
| Mode of Presentation: | Oral |
| Abstract Category : | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract : | Current observation suggests that star formation occurs along ubiquitus filaments, with massive stars forming in the densest regions where several filaments converge, called hubs. Identification of such hub-filament systems (HFSs) in the large-scale survey observations followed by a methodical analysis of the dynamics of the molecular material is a robust approach toward the study of the formation of massive young stellar objects.
We present the results of our recent study of the dust continuum, molecular line and radio continuum emission from an HFS identified in Herschel 250 micron images. The newly obtained GMRT data at 750 and 1260 GHz suggest the presence of three intensity peaks that match well with far-infrared sources in Herschel dust continuum maps. The observed radio continuum flux from the HII region indicates the presence of massive young stars, O8.5V or later, establishing the region as a site for massive star formation.To understand mass accretion and the role of filaments in forming massive stars within the hub, we observed the J=2-1 transition of CO and its isotopes using the APEX Chile. The column density map from dust continuum and integrated C^{18}O(2-1) emission are consistent, showing N(H_2) values of ~10^{23}cm^{-2} toward the hub. CO data unveil a complex velocity structure with multiple overlapping components. To identify velocity-coherent structures (filaments), we decomposed spectra into Gaussian components at all positions and grouped them in position-position-velocity space using a friends-of-friends algorithm. Analysis of velocity gradients along the identified velocity-coherent filaments reveals signatures of mass accretion, consistent with other massive star-forming HFSs.
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