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| Paper: |
Bulge-Disk Evolution in Interacting Bulgeless Galaxies |
| Volume: |
477, Galaxy Mergers in an Evolving Universe |
| Page: |
141 |
| Authors: |
Das, M.; Ramya, S.; Sengupta, C.; Mishra, K. |
| Abstract: |
Bulgeless galaxies are an extreme class of late type spiral galaxies
that have practically no bulge and are nearly pure disk in morphology.
Their lack of evolution is a puzzle for theories of galaxy formation
and the secular evolution of galaxy disks. However, one of the
processes by which these galaxies could evolve is through interactions
with other galaxies. In this study we present radio (GMRT) observations
of star formation in a sample of bulgeless galaxies. We did followup
Hα imaging and optical spectroscopy of two galaxies, NGC 3445 and
NGC 4027. Both galaxies have extended
emission associated with their tidal interactions. Their nuclei show
ongoing star formation but no signs of AGN activity. The R band
images suggest that their centers have
oval distortions or pseudobulges that may later evolve into larger bulges.
Thus interactions are an important trigger for the formation of bulges
in such disk dominated systems. |
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