Recycling of ghost galaxies: The origin of giant HI ring around NGC 1533

Details Recycling of ghost galaxies: The origin of giant HI ring around NGC 1533 Recycling of ghost galaxies: The origin of giant HI ring around NGC 1533

2003-10-14

arxiv.org/abs/astro-ph/0310358v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure (Color GIF file for Figure 1), in the proceedings of IAU 217 ''Recycling intergalactic and interstellar matt

Scientific paper

We propose that the giant HI ring recently discovered by HIPASS for S0 galaxy NGC 1533 is formed by unequal-mass merging between gas-rich LSB (low surface brightness: ``ghost'') galaxies and HSB disks. The NGC 1533 progenitor HSB spiral is transformed into a barred S0 during merging and the outer HI gas disk of the LSB is transformed into the giant HI ring. We also discuss two different possibilities for the origin of isolated star-forming regions (``ELdot'' objects) in the giant gas ring.

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