Astronomers Detect the Faint Glow of Stars in Between Galaxies - Universe Today
A team of astronomers developed a new technique to observe IGL and presented their results in a paper. It’s titled “
The new paper is a case study into the HSC and how it can be used for “… the analysis of extended faint structures within groups of galaxies,” as the authors explain. The team examined images from the GAMA survey. GAMA is a wide-field survey that studies galaxy formation and evolution. Several ground-based and space-based facilities contributed to GAMA, and the team combined data from GAMA and the HSC in their study.
This team of astronomers developed a method to remove the light from the galaxies and leave the light from the stars. Astronomers call this light intra-group light or intracluster light Removing unwanted light is a common theme in astronomy. But unlike other techniques, this one is modular and can be “transported” to different applications and still be effective.
Martínez-Lombilla and her colleagues found that the inter-group stars had different properties than the bulk of the stars in the nearby galaxy groups. They’re both younger and less metal-rich. “We think these individual stars were at some points stripped from their home galaxies, and now they float freely, following the gravity of the group,” said Dr. Martínez-Lombilla. “The stripping, called tidal stripping, is caused by the passage of massive satellite galaxies – similar to the Milky Way – that pull stars in their wake.”
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