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ASTRONOMY

DO LIRGs FOLLOW THE TULLY-FISHER RELATION?

Veronica M. Torres, Adriana J. ColСn; Colegio San Felipe, Arecibo,
Puerto Rico

Research Mentor: Dr. Tapasi Ghosh, Arecibo Observatory, Arecibo, Puerto
Rico


The purpose of this research was to study the LIRGs (Luminous Infrared
Galaxies) and see if they follow the Tully-Fisher relation. The LIRGs are
different to normal galaxies in the fact that they emit 90% of their
light in infrared. The Tully-Fisher relation states that the bigger the
galaxy is, the faster it rotates. The faster the galaxy rotates, the wider
is the emission line in velocity. Also, the bigger the galaxy, the more is
its luminosity. Tully-Fisher relation shows that for normal galaxies, the
velocity width (W) of the lines is proportional to its luminosity (L)
following an equation, L ? W?. In a sample of 33 LIRGs the neutral
hydrogen emission line width was measured. The luminosities of these
galaxies from literature were found and a study was made of whether the
Tully-Fisher law is maintained by the LIRGs. This indicates whether the
LIRGs are peculiar either in their motion or in the amount of light they
emit.