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Detection of 12CO and 13CO of NGC6764
Yixian Cao1
Gina Duggan2
Jesus Rivera3
CARMA Summer School 2013
1University of Illinios, 2Caltech, 3Rutgers University
● Observed spriral barred galaxy NGC6764● Detect 13CO and 12CO lines ● 12CO/13CO ratio can give us insight into the
physics of the galaxy● Used MIRIAD to reduce and analyze data
Introduction and Motivation
NGC6764
http://www2011.mpe.mpg.de/ir/ALFA/ngc6764.html
Zero and First Moment Maps 12CO(1-0)
Zero and First Moment Maps 13CO(1-0)
12CO and 13CO mom0 maps
R(12CO/13CO) map
Zero Moment for 12CO(1-0)
Position Velocity Map 12CO(1-0)
Spectra 12CO(1-0)
Zero Moment for 13CO(1-0)
Spectra 13CO(1-0)
12CO(1-0) 13CO(1-0)
12CO(1-0) 13CO(1-0)
12CO(1-0) and 13CO(1-0)
it’s scaled, so technically 12CO/average(12CO) and 13CO/average(13CO)
A B C
D E
Spectra Ratio of 12CO(1-0)/13CO(1-0)
for 5 Spectral Windows
Conclusion● Integrated spectral line ratio of 12CO/13CO
calculated was ~19.13 (compared to 18+-4)
Eckart, A., Cameron, M., Jackson, J. M., Genzel, R., Harris, A. I., Wild, W., Zinnecker, H. 1991, ApJ, 372, 67
Thanks CARMA Summer School staff and students!