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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 |
| Institution: | (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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