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Date and Time of the Query: 2019-06-26 T11:39:28 PDT
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For refcode 1998ApJ...496..786C:
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Copyright by American Astronomical Society. Reproduced by permission
1998ApJ...496..786C Large-Scale Outflows in Edge-on Seyfert Galaxies. III. Kiloparsec-Scale Soft X-Ray Emission EDWARD J. M. COLBERT, STEFI A. BAUM, CHRISTOPHER P. O'DEA, AND SYLVAIN VEILLEUX Received 1997 July 15; accepted 1997 November 5 ABSTRACT We present ROSAT PSPC and HRI images of eight galaxies selected from a distance-limited sample of 22 edge-on Seyfert galaxies. Kiloparsec-scale soft X-ray nebulae extend along the galaxy minor axes in three galaxies (NGC 2992, NGC 4388, and NGC 5506). The extended X-ray emission has 0.2- 2.4 keV X-ray luminosities of 0.4-3.5 x 10^40^ ergs s^-1^. The X-ray nebulae are roughly cospatial with the large-scale radio emission, suggesting that both are produced by large-scale galactic outflows. Assuming pressure balance between the radio and X-ray plasmas, the X-ray filling factor is ~>104 times larger than the radio plasma filling factor, suggesting that large-scale outflows in Seyfert galaxies are predominantly winds of thermal X-ray-emitting gas. We favor an interpretation in which large-scale outflows originate as active galactic nucleus-driven jets that entrain and heat gas on kiloparsec scales as they make their way out of the galaxy. Active galactic nucleus- and starburst-driven winds are also possible explanations in cases where the winds are oriented along the rotation axis of the galaxy disk. Subject headings: galaxies: active-galaxies: kinematics and dynamics - galaxies: Seyfert-X-rays: galaxies
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