Research Division Seminar
Seeing the ghostly galactic halos

Abstract

The Universe is far most mysterious than we think, and scientists are fathomed by the mysteries of the Universe that are the ghostliest of them. In modern cosmology one of the mysterious unsolved problems is the so-called "missing baryon problem". There are many evidences that a fraction of missing baryons are in the galactic halos, but, the hurdle is the true nature of these halos. In 1995 it was proposed that a fraction of the halos is composed of molecular clouds, and they might have a sufficient fraction of missing baryons. In the same year, a novel method of seeing the clouds was proposed, that is to look for a temperature asymmetry in the Cosmic Microwave Background (CMB) towards the M31 galaxy, due to a "Doppler effect" induced by the M31 halo rotation. This temperature asymmetry has since been seen and confirmed in M31 and other galaxies and used to study the rotation of galactic halos and map their dynamics. It had been questioned whether such clouds could actually exist, and in response, the clouds were modeled and shown to be possible. In this seminar, I will explain how we were able to model such clouds and in the future how we hope that we could explain the halo dynamics to constrain the fraction of missing baryons in the galactic halos.

Zoom: https://rediris.zoom.us/j/85021846500?pwd=bTVuUndsSmtFdzY2NWRZMmkraE9Ndz09
Meeting ID: 850 2184 6500 Passcode: 948555

Youtube:https://youtu.be/liLpk9L2jCo