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Session 40 - Radiogalaxies & Jets.
Display session, Tuesday, January 14
Using the Near Infrared Camera on the Keck Telescope and the Longslit Spectrograph on the Hale 200 inch Telescope we are obtaining deep near infrared images and spectra of a sample of high redshift, z>2 radio galaxies. The low resolution (R\sim80) grism provides for simultaneous J amp; H or H amp; K band spectra along a 0.6'' \times 38'' slit, allowing a detailed map of the emission line and continuum flux density to be made in these objects on spatial scales of 5-300 kpc. The high resolution (R\sim800) spectrograph allows detailed follow up of the brightest sources on kinematic scales of 300-400 km s^-1. We present Keck and Palomar spectra of MRC0406-24 (z=2.44), along with Keck spectra of 4C +40.36 (z=2.27) and 4C +39.37 (z=3.22). All three show strong optical line emission, extended over 30-50 kpc, which accounts for 50%-70% of the broad-band near-infrared flux from these galaxies. The [OIII] line in MRC0406-24 is double, with a spatial and kinematic separation of \sim10 kpc and \sim800 km s^-1, respectively. The continuum is clearly detected in all three radio galaxies. We will discuss these results in the light of theories of galactic evolution and the interaction of AGN with their host galaxy interstellar media.
Program listing for Tuesday