High-redshift radio galaxies from the Molonglo Catalogue

McCarthy, P. J.; Kapahi, V. K.; Breugel, Wil van; Subrahmanya, C. R.

doi:10.1086/115575

Cited by 47 publications

(35 citation statements)

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“…MRC 0156-256 has, at least, four bright close-by companions previously reported in McCarthy et al (1990), Pentericci et al (2001) and Galametz et al (2010a), including the brightest source (in the near-infrared) usually identified as the radio source. Figure 1 shows the 15 × 15 immediate surroundings of MRC 0156-252 in B (pre-imaging; see Sect.…”

Section: Mrc 0156-252mentioning

confidence: 93%

“…An optical spectrum of the radio galaxy revealed three emission lines that McCarthy et al (1990) identified as Lyα, CIV and HeII at a redshift of z = 2.016. MRC 0156-252 has narrow Lyα emission and shows an extended optical morphology (McCarthy et al 1990) but it is unresolved at near-infrared wavelengths (McCarthy et al 1992). This led McCarthy (1993) to conclude that MRC 0156-252 has an old stellar population with some on-going star-formation that could explain the extended rest frame UV emission.…”

Section: Mrc 0156-252mentioning

confidence: 99%

“…Only limited shallow optical data were available in the field of MRC 0156-252 prior to the FORS2 run from Las Campanas (r, I and Lyα data; McCarthy et al 1990;Pentericci et al 2001) and HST/WFPC2 (F555W; Overzier et al 2005). To accurately design the masks for the FORS2 spectroscopy, we obtained deep (3.8 h) imaging in the b HIGH band (λ = 440 nm corresponding to ∼145 nm rest frame at z = 2.02; referred to as B hereafter).…”

Section: Mask Design and Targetsmentioning

confidence: 99%

“…HeII is also the strongest emission line in this part of the spectrum. McCarthy et al (1990) had previously assigned a redshift of z = 2.016 through optical spectroscopy while Eales & Rawlings (1996) found through near-infrared spectroscopy that the Hα line was redshifted by ∼1000 km s −1 . Results from Eales & Rawlings (1996) Fig.…”

Section: The Radio Galaxy Companionsmentioning

confidence: 99%

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A large-scale galaxy structure atz = 2.02 associated with the radio galaxy MRC 0156-252

Galametz

Stern

Pentericci

et al. 2013

A&A

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We present the spectroscopic confirmation of a structure of galaxies surrounding the radio galaxy MRC 0156-252 at z = 2.02. The structure was initially discovered as an overdensity of both near-infrared selected z > 1.6 and mid-infrared selected z > 1.2 galaxy candidates. We used the VLT/FORS2 multi-object spectrograph to target ∼80 high-redshift galaxy candidates, and obtain robust spectroscopic redshifts for more than half the targets. The majority of the confirmed sources are star-forming galaxies at z > 1.5. In addition to the radio galaxy, two of its close-by companions (<6 ) also show AGN signatures. Ten sources, including the radio galaxy, lie within | z − 2.020 | <0.015 (i.e., velocity offsets <1500 km s −1 ) and within projected 2 Mpc comoving of the radio galaxy. Additional evidence suggests not only that the galaxy structure associated with MRC 0156-252 is a forming galaxy cluster but also that this structure is most probably embedded in a larger-scale structure.

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Section: Mrc 0156-252mentioning

confidence: 93%

Section: Mrc 0156-252mentioning

confidence: 99%

Section: Mask Design and Targetsmentioning

confidence: 99%

Section: The Radio Galaxy Companionsmentioning

confidence: 99%

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A large-scale galaxy structure atz = 2.02 associated with the radio galaxy MRC 0156-252

Galametz

Stern

Pentericci

et al. 2013

A&A

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“…In this letter we present spectroscopic observations of the extended emission line halo around MRC 2104-242. This radio source is identified with a galaxy at z = 2.49 and is one of the brightest known HzRGs in Lyα (McCarthy et al 1990). Narrowband Lyα images show a total extent of >12 (i.e.…”

Section: Introductionmentioning

confidence: 96%

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

Overzier

Röttgering

Kurk

et al. 2001

A&A

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Abstract. We present spectroscopic observations of the rest-frame UV line emission around radio galaxy MRC 2104-242 at z = 2.49, obtained with FORS1 on VLT Antu. The morphology of the halo is dominated by two spatially resolved regions. Lyα is extended by >12 along the radio axis, C IV and He II are extended by ∼8 . The overall spectrum is typical for that of high redshift radio galaxies. The most striking spatial variation is that N V is present in the spectrum of the region associated with the center of the galaxy hosting the radio source, the northern region, while absent in the southern region. Assuming that the gas is photoionized by a hidden quasar, the difference in N V emission can be explained by a metallicity gradient within the halo, with the northern region having a metallicity of Z ≈ 1.5 Z and Z ≤ 0.4 Z for the southern region. This is consistent with a scenario in which the gas is associated with a massive cooling flow or originates from the debris of the merging of two or more galaxies.

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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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High-redshift radio galaxies from the Molonglo Catalogue

Cited by 47 publications

References 0 publications

A large-scale galaxy structure atz = 2.02 associated with the radio galaxy MRC 0156-252

A large-scale galaxy structure atz = 2.02 associated with the radio galaxy MRC 0156-252

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

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

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