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CO in Stephan's Quintet: First Evidence of Molecular Gas in the Intragroup Starburst | | Yu Gao
; Cong Xu
; | | Date: |
7 Aug 2000 | | Subject: | astro-ph | | Affiliation: | 1,2,3) and Cong Xu ( IPAC/Caltech, University of Toronto, University of Illinois | | 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 $approxgt 4sigma$ 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$ imes 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). | | Source: | arXiv, astro-ph/0008112 | | Services: | Forum | Review | PDF | Favorites | |
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