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2003MNRAS.346..273V - Mon. Not. R. Astron. Soc., 346, 273-294 (2003/November-3)
Kinematically quiet haloes around z ∼ 2.5 radio galaxies. Keck spectroscopy.
VILLAR-MARTIN M., VERNET J., DI SEREGO ALIGHIERI S., FOSBURY R., HUMPHREY A. and PENTERICCI L.
Abstract (from CDS):
The giant haloes often extend for more than 100 kpc and sometimes beyond the radio structures. They emit lines other than Lyα (Civ, Heii and Nv in some cases), typically found in the spectra of high-redshift active galaxies. Continuum is also often detected. The haloes are enriched with heavy elements at tens of kpc from the active nucleus. Typical Lyα luminosities and surface brightness (within the slit) are in the range 1043–44 erg/s and severalx10^-17 to -16^ erg/cm2/s/arcsec2, respectively. Estimated densities are in the range ∼17-150 cm–3. The quasar continuum is the dominant source of ionization of the quiescent haloes along the radio axis. The implied total quasar ionizing luminosities are in the range ∼severalx1045 -1047 erg/s, in the same range as radio-loud quasars at comparable redshift.
The detection of giant quiescent haloes in all objects suggests that they could be a common ingredient of high-redshift radio galaxies. The radio galaxies seem to be embedded within the haloes. The nature and the origin of the haloes, together with the cosmological implications, are also discussed.
Abstract Copyright: 2003 RAS
Journal keyword(s): galaxies: active - galaxies: formation - galaxies: high-redshift - early Universe
CDS comments: Table 4: IRAS 00812-7112 is a misprint for 00182-7112
Simbad objects: 16
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