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2007MNRAS.378..416V - Mon. Not. R. Astron. Soc., 378, 416-428 (2007/June-3)
VIMOS-VLT spectroscopy of the giant Lyα nebulae associated with three z ∼ 2.5 radio galaxies.
VILLAR-MARTIN M., SANCHEZ S.F., HUMPHREY A., DIJKSTRA M., DI SEREGO ALIGHIERI S., DE BREUCK C. and GONZALEZ DELGADO R.
Abstract (from CDS):
The morphologies are varied. The nebula of one source has a centrally peaked, rounded appearance. In the other two objects, it consists of two spatial components. The three nebulae are aligned with the radio axis within ≲30°. The total Lyα luminosities are in the range (0.3-3.4)x1044 erg/s. The Lyα spectral profile shows strong variation through the nebulae, with full width at half-maximum (FWHM) values in the range ∼400-1500 km/s and velocity shifts Voffset∼ 120-600 km/s.
We present an infall model that can successfully explain the morphology, size, surface brightness distribution and the velocity field of the Lyα nebula associated with MRC 1558-003. It can also explain why Lyα is redshifted relative to other emission lines and the FWHM values of the non-resonant Heii line. This adds further support to our previous conclusion that the quiescent giant nebulae associated with this and other high-redshift powerful radio galaxies are in infall. A problem for this model is the difficulty to reproduce the large Lyα FWHM values, which might be the consequence of a different mechanism.
We have discovered a giant (∼85 kpc) Lyα nebula associated with the radio galaxy MRC 0140-257 at z = 2.64. It shows strikingly relaxed kinematics (FWHM < 300 km/s and Voffset≲ 120 km/s), unique among high-z (≳2) radio galaxies.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): galaxies: active - galaxies: high-redshift - galaxies: individual: MRC 1558-003 - galaxies: individual: MRC 2025-218 - galaxies: individual: MRC 0140-257
Nomenclature: Fig.8: [VSH2007] MRC 0140-257 AN (Nos A1-A2).
Simbad objects: 7
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