NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-16 T19:03:16 PDT
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For refcode 2000ApJ...542L..83G:
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2000ApJ...542L..83G CO in Stephan's Quintet: First Evidence of Molecular Gas in the Intragroup Starburst Yu Gao and Cong Xu Received 2000 June 30; accepted 2000 August 4; published 2000 October 3 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 fully covers both the IGS region and the dominant group member Seyfert galaxy NGC 7319, as well as partially covering the intruder galaxy NGC 7318B. CO emission of >~4 {sigma} 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 wave bands (e.g., H I, mid-IR, and H{alpha}). Assuming the standard conversion factor, (3.6-8.0) x 10^8^ M_sun_ molecular gas is found to be associated with the IGS. By confining ourselves to the region of the CO emission peak, we find that a relatively high star formation efficiency of 8.6 L_sun_/M_sun_ is derived for the IGS, which is nearly comparable to that of local starburst galaxies. The IGS triggering mechanism is also briefly discussed. Subject headings: galaxies: clusters: individual (HCG 92)-galaxies: individual (NGC 7318B, NGC 7319)-galaxies: interactions-galaxies: starburst-infrared: galaxies -intergalactic medium-ISM: molecules
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