Abstract Details
| Name: Dhanya JS Affiliation: Malaviya National Institue of Technology Jaipur Conference ID: ASI2019_406 Title : STUDY OF A SYSTEM OF H II REGIONS ASSOCIATED WITH N36 BUBBLE AT THE GALACTIC BAR - NORMA ARM INTERFACE Authors and Co-Authors : Dhanya J S(MNIT Jaipur 302017) Lokesh Kumar Dewangan(PRL,Ahmedabad 380 009) D. K. Ojha (TIFR, Mumbai 400 005) Abstract Type : Poster Abstract Category : Stars, ISM and Galaxy Abstract : With the help of multi-wavelength approach, we present an investigation of a system of HII region associated with a mid-infrared bubble N36 (extension ∼35 pc, distance=6.0 kpc) toward l = 24.8, b = 0.1. The system is found to be situated at the interface of Galactic bar and Norma Galactic arm in the Milky Way where one may expect the collisions of molecular clouds due to the bar potential. Each of the HII regions (dynamical age ∼0.4-1.3 Myr) in the system is powered by a radio spectral type of O star and is associated with the warmer emission (Td ∼23-32 K). Several ATLASGAL dust continuum clumps at 870 μm are observed toward the system and their masses vary between 185 and 7635 Msun.Many of the clumps have high bolometric luminosities (>10^3 Lsun) and are found toward the ionized regions in the system.Three 6.7 GHz Class II methanol masers are observed in the system, suggesting the presence of early phases of massive star formation (< 0.1 Myr). Using the Spitzer photometric data, we find noticeable protostars towards the H II regions, tracing the ongoing star formation activity in the system. In order to study the kinematics of molecular gas in the system, the GRS 13CO line data analysis is performed, which reveals two velocity components (around 109 and 113 km/s) in the direction of the system. These components are also interconnected in the velocity space. Signatures of massive star formation are investigated at the common zones of the two clouds, where four HII regions, massive clumps (> 10^3 Msun), two 6.7 GHz methanol masers, and embedded protostars are also traced. Taken into account of all these observational results, the presence of the system of HII regions, and the formation of the O-type stars appear to be explained by the interaction of molecular clouds at the Galactic bar-Norma arm interface. |