Abstract Details

Name: Anuj Gupta
Affiliation: Panjab University
Conference ID: ASI2021_538
Title : EVOLUTION OF INTERSTELLAR DUST MASS ACROSS OUR GALAXY
Authors and Co-Authors : Anuj Gupta* (Department of Physics, Panjab University, Chandigarh, India), Sandeep Sahijpal (Department of Physics, Panjab University, Chandigarh, India)
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : Interstellar dust, that traps the non-volatile elements in significant amount, is an essential constituent of baryonic matter distribution in the galaxies. The origin of the dust grains is possible only in stellar environments, but their reprocessing and evolution takes place in the interstellar medium (ISM) after their injection into the ISM. Dust grains do not behave like a passive audience but contribute in the various physicochemical processes occurring in distinct astrophysical environments. These processes include their role in the interstellar chemistry, the formation of hydrogen molecule, the process of stellar formation, the commencement of planetary formation etc. In this work (doi:10.1093/mnras/staa897), we have deduced a novel mass-balance formalism to understand the abundance evolution of the distinct types of interstellar dust grains in our Milky-Way Galaxy over the Galactic time-scales. The Galaxy is evolved in terms of elemental evolution resulting from stellar nucleosynthetic contributions of several generations of stars and the various condensable elements are redistributed into various grain constituents during the Galactic evolution. Thus, we have attempted to assess the relative abundances of the major constituents of interstellar dust and computed the normalized mass distributions of distinct dust grain components for the distinct epochs over the entire Galaxy. This is perhaps a novel attempt to estimate the bulk dust mass budget in the evolving Galaxy. As we move away from the Galactic center, the normalized Galactic dust mass is predicted to decrease. Therefore, the dust mass is more in the inner annular rings of the Galaxy. However, the Galactic dust mass is predicted to be increasing with the temporal evolution which can be understood on the basis of the enrichment of ISM with heavier and refractory elements by successive stellar generations.