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!