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Halo ejection in distant radio galaxies: jet feedback in massive galaxy formation |
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| Authors: | Michael A. Dopita Michiel Reuland Wil van Breugel Wim de Vries S. A. Stanford Huub Röttgering George Miley Bram Venemans Hy Spinrad Steve Dawson Arjun Dey Mark Lacy Daniel Stern Andrew Bunker |
| Affiliation: | (1) Research School of Astronomy and Astrophysics, ANU, Cotter Road, Weston Creek, ACT, 2611, Australia;(2) Institute of Geophysics and Planetary Physics, LLNL, L-413, Livermore, CA 94550, USA;(3) Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, Netherlands;(4) Department of Astronomy, University California at Berkeley, Berkeley, CA 94720, USA;(5) University California at Merced, P.O. Box 2039, Merced, CA 95344, USA;(6) SIRTF Science Center, Caltech, MS 220-6, 1200 E. California Bvd, Pasadena, CA 91125, USA;(7) JPL, California Institute of Technology, MS 169-327, Pasadena, CA 91109, USA;(8) IOA, Cambridge University, Madingley Road, Cambridge, CB3 0HA, UK;(9) Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, Netherlands;(10) Physics Dept., University California at Davis, One Shields Avenue, Davis, CA 95616, USA |
| Abstract: | We present results from a Keck optical and near IR spectroscopic study of the giant emission line halos of the z>3 High Redshift Radio Galaxies (HiZRGs) 4C 41.17, 4C 60.07 and B2 0902+34. The outer regions of these halos show quiet kinematics with typical velocity dispersions of a few hundred km s−1 and velocity shears consistent with rotation. The inner regions contain shocked, clumpy cocoons of gas closely associated with the radio lobes with disturbed kinematics and expansion velocities and/or velocity dispersions >1000 km s−1. We also find evidence for the ejection of chemically enriched material in 4C 41.17 up to a distance of ∼60 kpc along the radio-axis. We infer that these HiZRGs are undergoing a final jet-induced phase of star formation with the ejection of most of their interstellar medium before evolving to become “red and dead” Elliptical galaxies. |
| Keywords: | Galaxies: active Galaxies: formation Galaxies: high-redshift Galaxies: individual (4C 41.17, 4C 60.07, B2 0902+34) Quasars: emission lines |
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