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CO in Stephan's Quintet: First Evidence of Molecular Gas in the Intragroup Starburst

Yu Gao·Cong Xu
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Abstract

We present the first interferometric evidence of CO(1-0) emission in the intragroup starburst (IGS) region of HCG~92 (Stephan's Quintet). BIMA's large primary beam covers fully both the IGS region and the dominant group member galaxy Seyfert NGC 7319, as well as partially the intruder galaxy NGC 7318B. CO emission of $\approxgt 4σ$ is detected in all of them. The detection of the CO emission associated with the IGS is further supported by comparisons with observations in other wavebands (e.g., HI, mid-IR, \ha). Assuming the standard conversion factor, 3.6--8.0$\times 10^8~\Msun$ molecular gas is found to be associated with the IGS. Confining to the region of the CO emission peak, a relatively high star-formation efficiency of 8.6$\Lsun/\Msun$ is derived for the IGS, which is nearly comparable to that of local starburst galaxies (e.g., M82).

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Yu Gao, Cong Xu. 2000-08-07. CO in Stephan's Quintet: First Evidence of Molecular Gas in the Intragroup Starburst. https://doi.org/10.1086/312940

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