Analysis of a Blowout in Galaxy NGC 3628 Using Infrared Polarization
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Analysis of a Blowout in Galaxy Analysis of a Blowout in Galaxy NGC 3628 Using Infrared NGC 3628 Using Infrared
PolarizationPolarizationBy Megan Teckman
2002 - 2003
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Introduction
• The question addressed in this project was whether a blowout exists in galaxy NGC 3628.
• M 82
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• Spiral galaxy • Edge on • Dust belt • Radio and X-ray emissions• Magnetic field• Dust• IR • Blowout
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Purpose
• The purpose of this project was to ratify the existence of a blowout by mapping the magnetic field using images taken in polarized IR.
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Image from http://www.ifa.hawaii.edu/mko/maunakea.htm
NASA Infrared Telescope Research Facility
Mauna Kea, Hawaii
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Methods
• Infrared Reduction and Analysis Facility (IRAF).
• Cropping & sorting.
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• Sky Subtraction
Original Galaxy Image
Surrounding Sky
Sky-subtracted Image
- =
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• Creating Flat Fields • Averaging
“Lights On” “Lights Off” “Flat”- =
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• Fixing Pixels (fixpix)• Normalizing
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• Flat Fielding• Centering• Shifting
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• Smoothing• Masking• Translating
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• Axum vector plotting
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Results
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Discussion
• The magnetic field skewed perpendicularly • Suggests blowout• The practical applications
– expanded knowledge– effectiveness of analyses
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Further Study
• 3 x 3 pixel box• Observation of the brighter regions
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Acknowledgments
• Dr. Terry Jay Jones
• April Homich and Garret Kuchta
• Mrs. Lois Fruen and Ms. Chelen Johnson
• Dr. Dave Thomas and Dr. Ian Armitage
• Team Research