A Large-field J = 1 ─ 0 Survey of CO and Its Isotopologues toward the 
Cassiopeia A Supernova Remnant

Ma, Yuehui; Wang, Hongchi; Zhang, Miaomiao; Li, Chong; Yang, Ji

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A Large-field J = 1 ─ 0 Survey of CO and Its Isotopologues toward the Cassiopeia A Supernova Remnant

MPS-Authors

Ma, Yuehui
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wang, Hongchi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhang, Miaomiao
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Li, Chong
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yang, Ji
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019ApJ...878...44M
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Citation

Ma, Y., Wang, H., Zhang, M., Li, C., & Yang, J. (2019). A Large-field J = 1 ─ 0 Survey of CO and Its Isotopologues toward the Cassiopeia A Supernova Remnant. The Astrophysical Journal, 878.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D313-7

Abstract

We have conducted a large-field simultaneous survey of ¹²CO, ¹³CO, and C¹⁸O J = 1 − 0 emission toward the Cassiopeia A (Cas A) supernova remnant (SNR), which covers a sky area of 3.°5 × 3.°1. The Cas giant molecular cloud (GMC) mainly consists of three individual clouds with masses on the order of 10⁴−10⁵ M _☉. The total mass derived from the ¹³CO emission of the GMC is 2.1 × 10⁵ M _☉ and is 9.5 × 10⁵ M _☉ from the ¹²CO emission. Two regions with broadened (6─7 km s⁻¹) or asymmetric ¹²CO line profiles are found in the vicinity (within a 10′ × 10′ region) of the Cas A SNR, indicating possible interactions between the SNR and the GMC. Using the GAUSSCLUMPS algorithm, 547 ¹³CO clumps are identified in the GMC, 54% of which are supercritical (i.e., α _vir < 2). The mass spectrum of the molecular clumps follows a power-law distribution with an exponent of −2.20. The pixel-by-pixel column density of the GMC can be fitted with a log-normal probability distribution function (N-PDF). The median column density of molecular hydrogen in the GMC is 1.6 × 10²¹ cm⁻² and half the mass of the GMC is contained in regions with H₂ column density lower than 3 × 10²¹ cm⁻², which is well below the threshold of star formation. The distribution of the YSO candidates in the region shows no agglomeration.