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Date and Time of the Query: 2019-06-25 T11:16:36 PDT
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For refcode 2012A&A...540A.112D:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2012A&A...540A.112D Survival of molecular gas in Virgo's hot intracluster medium: CO near M 86 Dasyra, K. M.; Combes, F.; Salome, P.; Braine, J. Abstract. We carried out ^12^CO(1-0) and ^12^CO(2-1) observations of 21 different regions in the vicinity of M 86, NGC 4438, and along the 120 kpc-long, H{alpha}-emitting filamentary trail that connects them, aiming to test whether molecular gas can survive to be transferred from a spiral to an elliptical galaxy in Virgo's 10^7^ K intracluster medium (ICM). We targeted H{alpha}-emitting regions that could be associated with the interface between cold molecular clouds and the hot ionized ICM. The data, obtained with the 30 m telescope of the Institut de Radioastronomie Millimetrique, led to the detection of molecular gas close to M 86. CO gas with a recession velocity that is similar to that of the stars, -265 km s^-1^, and with a corresponding H_2_ mass of 2 x 10^7^ M_{sun}_, was detected ~10 kpc southeast of the nucleus of M 86, near the peak of its H I emission. We argue that it is possible for this molecular gas either to have formed in situ from H I, or to have been stripped from NGC 4438 directly in molecular form. In situ formation is nonetheless negligible for the 7 x 10^6^ M_{sun}_ of gas detected at 12:26:15.9+12:58:49, at ~10 kpc northeast of M 86, where no (strong) H I emission is present. This detection provides evidence for the survival of molecular gas in filaments for timescales of ~100 Myr. An amount equivalent to 5 x 10^7^ M_{sun}_ of H_2_ gas that could be lost to the ICM or to neighboring galaxies was also discovered in the tidal tail northwest of NGC 4438. A scenario in which gas was alternatively brought to M 86 from NGC 4388 was also examined but it was considered unlikely because of the non-detection of CO below or at the H I stream velocities, 2000-2700 km s^-1^. Key words: evolution, ISM: kinematics and dynamics, galaxies: interactions, galaxies: clusters: individual: Virgo, galaxies: clusters: intracluster medium, ISM: clouds
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