Abstract Details
| Name: Aditya Chowdhury Affiliation: National Centre for Radio Astrophysics Conference ID: ASI2017_447 Title : Angular Momentum Content in Gas Rich Dwarf Galaxies Authors and Co-Authors : Jayaram N. Chengalur National Centre for Radio Astrophysics, Pune. Abstract Type : Oral Abstract Category : Extragalactic astronomy Abstract : Angular momentum dictates the morphology of a galaxy - systems with high angular momentum form thin disks whereas those with low angular momentum form bulges. Angular momentum is thought to have originated from tidal torquing in the primordial universe when proto-galaxies were collapsing. Further evolution of the angular momentum depends on the merger history. In a hierarchical evolution scenario, dwarf galaxies are thought to be progenitors of larger galaxies and hence it is interesting to quantify their specific angular momentum. In this talk we present a study of the angular momentum content in a sub-class of dwarf galaxies - those with very high HI to stellar mass ratio. For these galaxies the angular momentum can be determined with relatively little uncertainty arising from the stellar mass to light ratio. We have measured the specific baryonic angular momentum for a sample of five gas rich dwarf galaxies and compare their location on the earlier established angular momentum-mass correlation for galaxies. Our sample extends the angular momentum-mass plane to two orders of magnitude in mass below what was done in previous studies. We find that these gas rich dwarf galaxies have significantly more specific angular momentum than expected from the existing correlation. We discuss possible reasons for the observed discrepancy. |