Abstract Details
| Name: mousumi das Affiliation: indian insitute of astrophysics Conference ID: ASI2015_581 Title : The Dark Matter Content of the Bulgeless Galaxies NGC4701 and NGC4775 and its Implications for Disk Evolution Authors and Co-Authors : Chandreyee Sengupta (Korea Astronomy and Space Science Institue, Korea), M.Honey (Indian Insitute of Astrophysics) Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : We present GMRT HI imaging and HCT optical observations of two bulgeless spiral galaxies NGC4701 and NGC4775. Both galaxies are close to face-on and nearly pure disk in morphology. NGC4701 is a small low surface brightness galaxy wih a very extended HI gas disk and NGC 4775 is a gas rich dwarf. We used our HI maps to derive the dark matter content of both galaxies in order to understand the role of the dark halo in limiting bulge formation in disk galaxies. Our results show that NGC4701 is a halo dominated galaxy whereas NGC4775 has comparable stellar and halo masses. We also contrast the nuclear and disk properties of both galaxies. Our findings suggest that although the dark matter halo is important for inhibiting star formation in spirals, it is not important for slowing down the formation of bulges in pure disk galaxies. We discuss the implications of our results for the formation and evolution of these systems. |