التفاصيل البيبلوغرافية
| العنوان: |
Investigating the Drivers of CO-to-H2 Conversion Factor Variations in Nearby Galaxy Centers. |
| المؤلفون: |
Teng, Yu-Hsuan, Sandstrom, Karin |
| المصدر: |
Proceedings of the International Astronomical Union; 6/9/2023, Vol. 17 Issue S373, p157-160, 4p |
| مصطلحات موضوعية: |
MOLECULAR gastronomy, TURBULENCE, BARRED galaxies, COLD gases, STAR formation |
| مستخلص: |
The CO-to-H2 conversion factor (αCO) is crucial for accurate estimation of the amount and properties of molecular gas. However, αCO is known to vary with environmental conditions, and previous kpc-scale studies have revealed lower αCO in the centers of some barred galaxies, including NGC 3351, 3627, and 4321. We present ALMA Band 3, 6, and 7 observations toward the inner ∼2 kpc of these galaxies tracing 12CO, 13CO, and C18O lines at ∼100 pc resolution. We show that dynamical effects resulting from turbulence/shear can lead to substantially lower αCO in the bar-driven inflows of NGC 3351 due to lower optical depth. A clear, positive correlation between αCO and 12CO optical depth is seen in all three galaxy centers. We also find that the CO/13CO(2–1) ratio mainly traces the 12CO optical depth, and thus it may be a useful observable in predicting αCO variation in galaxy centers. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |