NGC 7385 - Generation of an H II region by thermal instability associated with the creation of a radio source

Details NGC 7385 - Generation of an H II region by thermal instability associated with the creation of a radio source NGC 7385 - Generation of an H II region by thermal instability associated with the creation of a radio source

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..502h&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Dec. 1, 1980, p. 502-510.

Other

18

Extragalactic Radio Sources, H Ii Regions, Intergalactic Media, Radio Galaxies, Thermal Instability, Astronomical Maps, Astronomical Models, Dynamic Models

Scientific paper

We have mapped the radio source NGC 7385 with the VLA at high resolution. The radio map suggests ejection of material from the galactic nucleus in directions parallel and antiparallel to the motion of the galaxy through the intergalactic medium. An optical knot detected by Simkin and Ekers is associated with the leading radio component. Our observations place the optical knot which is probably an H II region toward one edge of the radio lobe. The existence of an H II region in an elliptical galaxy and the position of the H II region in respect to the radio source suggest that more than coincidence is involved. We show that, for this particular galaxy, it is quite possible that an H II region may be produced in the interstellar medium (ISM) by interaction between the ISM and a jet ejected from the galactic nucleus, and thermal instabilities in the ISM. We also investigate the conditions for production of H II regions by thermal instability from a jet containing mixed relativistic and thermal material. Such processes may be important in other radio galaxies.

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