8-10 June 2016
Asia/Bangkok timezone

A study of CMB foreground spectral index using Planck data release II

Jun 9, 2016, 9:00 AM
Room J1

Room J1

Oral presentaion Astronomy, Astrophysics and Cosmology Session XIII


wanchalerm khwammai


Cosmic Microwave Background (CMB) is the most important evidence for the Big Bang theory. The CMB radiation has been traversing the universe towards us since 378,000 years after the Big Bang. It was accidentally discovered by Arno Penzias and Robert Wilson in 1964 using their horn-feed antenna. This research is looking at foreground emissions of the CMB signal, focusing on synchrotron, free-free, and thermal dust and spinning dust radiation. We use the ESA Planck satellite mission data released in 2015. The Planck mission cover a wide range of radio and microwave frequency bands, from 27-77 GHz the Low Frequency Instrument (LFI) and 100-857 GHz the High Frequency Instrument (HFI). In this work use the spectral index method. From the results, when we observed at low frequency bands, the signal consists of CMB, synchrotron radiation and free-free emission. The spectral index distribution at high frequency bands have effect from thermal dust emission and effect from zodiacal light. When we considered the spectral index map we see the explicit separation between regions in galactic plane and around galactic plane and when we convert spectral index to temperature, we found that high-galactic latitude region has higher temperature than in galactic plane. This high temperature dust is believed to be a result of Supernovae explosion ejecting gas and dusts outwards and above the Galactic plane. The dust then falls back on to the plane as it cools down providing cold gas supply for new star formation in the Galactic disk.

Primary author


Dr Nuanwan Sanguansak (Advisor) Dr Utane Sawangwit (Co-Advisor)

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