Physical Conditions and Star Formation Activity in the Intragroup Medium of Stephan's Quintet

C. K. Xu; N. Lu; J. J. Condon; M. Dopita; R. J. Tuffs

doi:10.1086/377445

paper

Physical Conditions and Star Formation Activity in the Intragroup Medium of Stephan's Quintet

arXiv:astro-ph/0306261 · doi:10.1086/377445

Abstract

New multi-band observations of the famous compact group of galaxies Stephan's Quintet (SQ) are presented and analyzed. These include far infrared (FIR) images at 60 $μ m$ and 100 $μ m$ (ISOPHOT C-100 camera), radio continuum images at 1.4 GHz (VLA B-array) and 4.86 GHz (VLA C-array), and long-slit optical spectrographs (Palomar $200"$ telescope). With these new data, we aim to learn more about the X-ray/radio ridge in the middle of the intragroup medium (IGM) and the IGM starburst SQ-A, both are likely to be caused by the high speed collision ( $\sim 900$ km s $^{- 1}$ ) between the intruder galaxy NGC 7318b ( $v = 5700$ km s $^{- 1}$ ) and the IGM ( $v = 6600$ km s $^{- 1}$ ).

arXiv comment31 pages text, 17 figures. Accepted by ApJ. A PS file including all figures can be found in http://spider.ipac.caltech.edu/staff/cxu/preprints/sq/apj_sq.ps.gz

Physical Conditions and Star Formation Activity in the Intragroup Medium of Stephan's Quintet

Abstract

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