Massive stars play a vital role in the star formation process, yet their own formation and their effects on subsequent generations of star formation are not well understood.
My Ph.D. thesis focuses on high-mass star formation in massive star-forming regions in the Galaxy such as W49, W43, W51 and Infrared Dark Clouds (IRDCs). One of the main goals of this study was to identify and classify the Young Stellar Objects (YSOs) in each region by using Spitzer Space Telescope IRAC & MIPS mid-IR data and 2MASS/UKIDSS near-IR data and then identify the massive YSO candidates based on the SED models. Following this, YSO clusters were identified based on spatial distributions of the detected sources.
Studying clusters with different evolutionary stages help us to understand the formation and evolution processes from beginning to end. This study also provides significant information on how massive stars interact with their environment and how they affect the low-mass star formation in the cloud.
We also study the star formation process from very early stages (clumps) and investigate the physical and chemical properties of these high-mass clumps in order to determine the early evolutionary stages. We chose high-mass ATLASGAL clumps that were identified as dark clumps at 8/24 micron and used MALT90 Survey data which provides a molecular line set to investigate different stages of star formation. Physical and chemical properties of these clumps were determined by using density tracers. SiO line was used to investigate shocks and outflows.