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ASTRONOMY

DO THE LOMINOUS INFRARED GALAXIES-LIRGs- FOLLOW THE HUBBLE LAW?

Yesenia M. Rivera; Antonio Lucchetti Vocational High School, Arecibo,
Puerto Rico
Harrison Rivera ColСn; Antonio Lucchetti Vocational High School,
Arecibo, Puerto Rico

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

All of the galaxies in the Universe emit some kind of light, some more or
less than others. In this research, those galaxies that emit their most
intense light in the infrared band were studied. These are called Luminous
Infrared Galaxies (LIRGs). The goal of this research was to inquire if,
like normal galaxies, LIRGs also follows Hubble's law. In 1929, Edwin
Hubble noted that the further away a galaxy was, the faster it was moving
away. This can be expressed as V=H0D and is called Hubble's Law. The
recessional velocities of the galaxies in the sample of LIRGs in this study
were derived from the observations of (redshifted) neutral hydrogen (HI)
spectra, and the application of the Doppler Effect. An independent
indication of their distances was obtained from their apparent angular
sizes, as gathered from the literature. The velocities obtained from the HI
spectra were plotted against the angular sizes of these Galaxies, and an
exploration was made whether or not the Hubble law is followed by the
galaxies in this sample.