| Name: Vipin Kumar |
| Affiliation: Space Applications Centre, ISRO |
| Conference ID: ASI2026_191 |
| Title: Massive star formation in the Hub-Filament system G339.467+0.083 |
| Abstract Type: Poster |
| Abstract Category: Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Author(s) and Co-Author(s) with Affiliation: Vipin Kumar(Space Applications Centre, ISRO, Ahmedabad - 380015, India), Shivam Kumaran(Space Applications Centre, ISRO, Ahmedabad - 380015, India), Sarita Vig(Indian Institute of Space Science and Technology, Thiruvananthapuram - 695547, India), Mun V. Shukla(Space Applications Centre, ISRO, Ahmedabad - 380015, India), Mehul Pandya(Space Applications Centre, ISRO, Ahmedabad - 380015, India) |
| Abstract: Hub-filament systems are major sites of star formation, especially massive stars in the interstellar medium, with gas and dust being channeled through elongated filamentary structures to central hubs. Hence, detailed investigation of star formation activity in multiple such systems is needed to be carried out in order to understand the physical processes involved in transport of gas and dust and their collapse leading to the formation of high mass stars.
We investigate the star formation activity in a Hub-filament system (HFS) candidate, G339.467+0.083. It is located at a distance of 6.7 kpc and has a vlsr of -110.1 km/s. We identify 9 filaments in the region using multiple filament identification tools (DisPerse, FilFinder, Getsf, Sūtra) employed on the H2 column density map derived from cold dust emission observed by Herschel as well as on the 13CO (2-1) integrated intensity map observed by APEX under the SEDIGISM survey.
We find that while most of the filaments are detected in both dust and gas based emissions, some are only detected in the former pointing towards the presence of CO-dark-H2 in the region. The filament masses range between ~ 340 - 450 M⊙ while their lengths range between ~ 10 - 20 pc. We also study the kinematic properties using the 13CO (2-1) emission where it is observed that filaments have blueshifted velocities and higher dispersions towards the hub. The mean H2 column density of the region is ~ 2 x 10^22 cm-2 with the peak column density of 2.6 x 10^23 cm-2 towards the hub. Multiple density tracers such as HCN, HNC, HCO+, C2H are also detected using observations from the MALT90 survey pointing towards active star formation in the region. |
