Producing Synthetic Maps Of Dust Polarization Using A Velocity Channel Gradient Technique

• Author / Creator

  Lu, Zekun

• In modern cosmology, many efforts have been put to detect primordial B-mode of cosmic microwave background polarization from the gravitational waves generated during inflation. Considering the foreground dust contamination of microwave polarization maps, it is essential to obtain a precise prediction for polarization in dust emission. In this work, we show a new method to produce synthetic maps of dust polarization in magnetized turbulent interstellar medium from more abundant high-resolution HI data. By using Velocity Channel Gradient technique, we are able to predict both direction and degree of dust polarization by investigating spectroscopic HI information in position-position-velocity space. We apply our approach to The Galactic Arecibo L-band Feed Array HI data, and find a good correspondence between synthesized maps and Planck's polarization measurements at 353 GHz. We also discuss how to incorporate noise information into the VChG method. Our method also provides a way to study Galactic magnetic fields from abundant HI data without reliance on true polarization mapping.

• Subjects / Keywords

  • Polarization
  • Turbulence
  • Interstellar medium

• Graduation date

  Fall 2020

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/r3-qp40-jp08

• License

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