Deep VLT spectroscopy of the $\vec{z}=$ 2.49 radio galaxy MRC 2104-242

Overzier, Roderik; Röttgering, H. J. A.; Kurk, J.; Breuck, C. De

doi:10.1051/0004-6361:20010041

Cited by 22 publications

(31 citation statements)

References 15 publications

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“…In particular, the He II line in the VM03 long-slit spectrum of the SW clump shows the same split as seen in the current VIMOS Lyα profile (see also Overzier et al 2001) Since the He II line is much less susceptible to absorption, this implies that the double structure is due to kinematics rather than absorption.…”

Section: Lyα Kinematicssupporting

confidence: 56%

The giant Lyα nebula associated with a z = 2.5 radio galaxy

et al. 2006

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Abstract. We present a kinematic and morphological study of the giant Lyα nebula associated with the radio galaxy MRC 2104−242 (z = 2.49) based on integral field spectroscopic VIMOS data from VLT. The galaxy appears to be embedded in a giant ( > ∼ 120 kpc) gas reservoir that surrounds it completely. The kinematic properties of the nebula suggest that it is a rotating structure, which would imply a lower limit to the dynamical mass of ∼ 3 × 10 11 M . An alternate scenario is that the gas is infalling. Such a process would be able to initiate and sustain significant central starburst activity, although it is likely to contribute with less than 10% of the total stellar mass of the galaxy.

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Section: Lyα Kinematicssupporting

confidence: 56%

The giant Lyα nebula associated with a z = 2.5 radio galaxy

et al. 2006

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“…The SW region shows a filamentary morphology in both Lyα and UV‐optical continuum emission (Pentericci et al 1999, 2001), and is aligned to within a few degrees of the radio axis. In this region, the line emission shows highly complex kinematics, with several blueshifted components (Koekemoer et al 1996; Overzier et al 2001; Pentericci et al 2001), and relatively low values for N v /He ii and N v /C iv (Overzier et al 2001). These properties bear a striking resemblance to the jet–gas interactions seen in 4C+48.48.…”

Section: Resultsmentioning

confidence: 99%

“…The FWHM of the IP is 310 ± 30 km s −1 at the redshifted wavelength of He ii λ1640. Overzier et al (2001) provide further details of these data.…”

Section: Data and Analysismentioning

confidence: 98%

Jet-gas interactions in z 2.5 radio galaxies: evolution of the ultraviolet line and continuum emission with radio morphology

Humphrey

Villar-Martı́n

Fosbury

et al. 2006

Monthly Notices of the Royal Astronomical Society

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We present an investigation into the nature of the jet–gas interactions in a sample of 10 radio galaxies at 2.3 < z < 2.9 using deep spectroscopy of the ultraviolet (UV) line and continuum emission obtained at Keck II and the Very Large Telescope. Kinematically perturbed gas, which we have shown to be within the radio structure in previous publications, is always blueshifted with respect to the kinematically quiescent gas, is usually spatially extended, and is usually detected on both sides of the nucleus. In the three objects from this sample for which we are able to measure line ratios for both the perturbed and quiescent gases, we suggest that the former has a lower ionization state than the latter. We propose that the perturbed gas is part of a jet‐induced outflow, with dust obscuring the outflowing gas that lies on the far side of the object. The spatial extent of the blueshifted perturbed gas, typically ∼35 kpc, implies that the dust is spatially extended at least on similar spatial scales. We also find interesting interrelationships between UV line, UV continuum and radio continuum properties of this sample.

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“…Spectra were extracted from six apertures. The kinematic structure (see also Overzier et al 2001) of this object is very complex, but recall that the spectrum has higher spectral resolution than for the rest of the sample. Two narrow [FWHM(He ii ) ≤ 200 and ∼400 km s −1 , respectively] components are found in the southern clump, which is associated with the narrow filament more than 2 arcsec long detected in HST images (Pentericci et al 1999).…”

Section: Resultsmentioning

confidence: 99%

Kinematically quiet haloes around z 2.5 radio galaxies. Keck spectroscopy

Villar-Martín

Vernet

Alighieri

et al. 2003

Monthly Notices of the Royal Astronomical Society

119

154

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We present the results of the kinematic study of the extended gas in a sample of 10 high‐redshift radio galaxies (z∼ 2.5) based on high signal‐to‐noise ratio Keck II and Very Large Telescope (VLT) long‐slit spectroscopy. In addition to the typical high surface brightness kinematically perturbed regions (FWHM and velocity shifts >1000 km s−1), we find in all objects giant low surface brightness haloes that show quieter kinematics with typical emission‐line FWHM and velocity shifts of ∼several hundred km s−1. The giant haloes often extend for more than 100 kpc and sometimes beyond the radio structures. They emit lines other than Lyα (C iv, He ii and N v 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−1 and several × 10−17 to −16 erg cm−2 s−1 arcsec−2, 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 ∼several × 1045–1047 erg s−1, 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.

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Deep VLT spectroscopy of the $\vec{z}=$ 2.49 radio galaxy MRC 2104-242

Cited by 22 publications

References 15 publications

The giant Lyα nebula associated with a z = 2.5 radio galaxy

The giant Lyα nebula associated with a z = 2.5 radio galaxy

Jet-gas interactions in z 2.5 radio galaxies: evolution of the ultraviolet line and continuum emission with radio morphology

Kinematically quiet haloes around z 2.5 radio galaxies. Keck spectroscopy

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