Oral Presentation
Morphology and Kinematics of Molecular Gas in the Double-barred Galaxy NGC 3504
Presenter: Yu-Ting Wu (NAOJ)
We present the results of ALMA CO(2-1) observation of the double-barred galaxy NGC 3504. With twenty times higher resolution (~0.8") than previous works, the inner molecular gas bar and inner spiral arm-like structures reveal in the central 1 kpc (~10") region. Besides, in the outer bar region, the CO emission is clearly aligned with the dust lanes. To investigate the kinematics in NGC 3504, we used Kinemetry (Krajnovic et al. 2006) to fit our velocity (moment 1) map and quantify the contribution of circular rotation as well as perturbations. We found that the circular rotation is dominated in all region and the radial motions exist in the innermost ∼3" and at R>10". Finally, taking advantage of the high resolution data, we derived the upper limit of the pattern speed ~52km/s/kpc using the method proposed by Hirota et al. (2009) with slight modification. Our result is slightly higher but quiet close to 41 km/s/kpc determined by Kuno et al. (2000).
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