ar X iv : a st ro - p h / 00 08 11 2 v 1 7 A ug 2 00 0 CO in Stephan ’ s Quintet : First Evidence of Molecular Gas in the Intragroup Starburst
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چکیده
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 > ∼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, Hα). Assuming the standard conversion factor, 3.6–8.0×10 M⊙ 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 8.6L⊙/M⊙ is derived for the IGS, which is nearly comparable to that of local starburst galaxies (e.g., M82). Subject headings: galaxies: individual (NGC 7319, NGC 7318B, HCG 92) — galaxies: interactions — intergalactic medium — galaxies: starburst — infrared: galaxies — ISM: molecules Infrared Processing and Analysis Center, Jet Propulsion Laboratory, Caltech 100-22, Pasadena, CA 91125 Department of Astronomy, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, CANADA Laboratory for Astronomical Imaging, Department of Astronomy, University of Illinois, 1002 W. Green Street, Urbana, IL 61801
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تاریخ انتشار 2000