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Date and Time of the Query: 2019-05-27 T04:19:44 PDT
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For refcode 1995A&A...298..699F:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1995A&A...298..699F ROSAT observations of the B2 radio galaxies 1615+35 and 1621+38: implications for the radio source confinement L. Feretti, R. Fanti, P. Parma, S. Massaglia, E. Trussoni, and W. Brinkmann Istituto di Radioastronomia del CNR, Via Gobetti 101, I-40129 Bologna, Italy Dipartimento di Astronomia dell'Universita, Via Zamboni 33, I-40133 Bologna, Italy Dipartimento di Fisica dell'Universita, Via Irnerio 46, I-40126 Bologna, Italy Osservatorio Astronomico di Torino, Strada dell'Osservatorio 20, I-10025, Pino Torinese, Italy Max-Planck-Institut fur Extraterrestrische Physik, Giessenbachstr., D- 85740 Garching, Germany Received 18 July 1994/Accepted 14 October 1994 Abstract. We report X-ray observations of the radio galaxies B2 1615+35 (NGC 6109) and B2 1621+38 (NGC 6137), which belong to poor groups of galaxies and are characterized by a "head-tail" structure. We also analyze the X-ray behaviour of the radio galaxy NGC 6107, present within the field of view and showing a symmetric extended radio structure. The X-ray emission from the group of 1615+35 is complex, including both emission from a hot intergroup gas, and emission from the individual radio galaxies (1615+35 itself, which is pointlike, and NGC 6107, which is extended). In the case of 1621+38, only extended X-ray emission from the galaxy itself is detected. The extended X-ray emission of the galaxies 1621+38 and NGC 6107 is probably related to a gaseous galactic atmosphere. The pointlike emission of the radio galaxy 1615+35, instead, is likely to originate in the nucleus. We discuss the confinement of radio components by the ambient gas, and find that the external thermal pressure exceeds the internal equipartition pressure. The X-ray emitting plasma in the 1615+35 group is characterized by luminosity, temperature and metallicity typical for groups, i.e. lower than for rich clusters. Its total mass is ~1/20 of the mass derived assuming hydrostatic equilibrium, implying that this group is likely to be dominated by dark matter, in agreement with results on other groups. A similar behaviour is found for the two coronas of NGC 6107 and 1621+38. Key words: galaxies: intergalactic medium - galaxies: interactions - radio continuum: galaxies - X-rays: galaxies - galaxies: individual: B2 1615+35, B2 1621+38
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