The Molonglo Reference Catalog 1 Jy Radio Source Survey. II. Radio Structures of Galaxy Identifications

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

doi:10.1086/313144

Cited by 63 publications

(31 citation statements)

References 46 publications

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“…We note that this HzRG is a broad line radio galaxy (Kapahi et al 1998) and is unresolved both in near-infrared and radio (Pentericci et al 2001). Investigating extremely red objects (EROs; R − K > 6) around high-z AGN, Cimatti et al (2000) found an excess of EROs in the close vicinity of MRC 1017-220 compared to the field.…”

Section: The Targetsmentioning

confidence: 71%

Galaxy protocluster candidates at 1.6 < z ≲ 2

Galametz

Vernet

Breuck

et al. 2010

A&A

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We present a study of protoclusters associated with high redshift radio galaxies. We imaged MRC 1017-220 (z = 1.77) and MRC 0156-252 (z = 2.02) using the near-infrared wide-field (7.5 × 7.5 ) imager VLT/HAWK-I in the Y, H, and K s bands. We present the first deep Y-band galaxy number counts within a large area (∼200 arcmin 2 ). We develop a purely near-infrared colour selection technique to isolate galaxies at 1.6 < z < 3 that may be associated with the two targets, dividing them into (i) red passively evolving or dusty star forming galaxies or (ii) blue/star formation dominated galaxies with little or no dust. Both targeted fields show an excess of star forming galaxies with respect to control fields. No clear overdensity of red galaxies is detected in the surroundings of MRC 1017-220 although the spatial distribution of the red galaxies resembles a filament-like structure within which the radio galaxy is embedded. In contrast, a significant overdensity of red galaxies is detected in the field of MRC 0156-252, ranging from a factor of ∼2−3 times the field density at large scales (2.5 Mpc, angular distance) up to a factor of ∼3−4 times the field density within a 1 Mpc radius of the radio galaxy. Half of these red galaxies have colours consistent with red sequence models at z ∼ 2, with a large fraction being bright (K s < 21.5, i.e. massive). In addition, we also find three galaxies within 5 of MRC 0156-252 suggesting that the radio galaxy has multiple companions within ∼50 kpc. We conclude that the field of MRC0156-252 shows many remarkable similarities with the wellstudied protocluster surrounding PKS1138-262 (z = 2.16) suggesting that MRC 0156-252 is associated with a galaxy protocluster at z ∼ 2.

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Section: The Targetsmentioning

confidence: 71%

Galaxy protocluster candidates at 1.6 < z ≲ 2

Galametz

Vernet

Breuck

et al. 2010

A&A

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“…Of the 19 galaxies, three are unresolved (MRC 0350[279, MRC 1017[220, USS 2202128) ; of these, the Ðrst two are also unresolved in the radio at all frequencies and MRC 1017[220 has been classiÐed as a broad-line radio galaxy (BLRG) by Kapahi et al (1998) on the basis of its emission line spectrum. In two other cases, MRC 1138[262 and MRC 2025[218, a nuclear point source dominates the emission in the central regions, but there is clearly underlying extended emission.…”

Section: Discussionmentioning

confidence: 99%

NICMOS Observations of High‐Redshift Radio Galaxies: Witnessing the Formation of Bright Elliptical Galaxies?

Pentericci¹,

McCarthy²,

Röttgering³

et al. 2001

ASTROPHYS J SUPPL S

108

181

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We present the results of a near-infrared imaging program of a sample of 19 radio galaxies with redshift between 1.7 and 3.2, using the NICMOS Camera 2 on the Hubble Space T elescope (HST ). The galaxies were observed in H band, which, for 18 of the 19 targets, samples the rest-frame optical emission longward of the 4000 break. For many sources this band contains emission lines, but we esti-A mated that this causes relatively little confusion in most cases. The high angular resolution of the HST allows a detailed study of the host galaxies. The images show a wide range of morphologies, including (i) compact systems, (ii) systems with substructures such as multiple emission peaks, and (iii) systems comprised of several components spread over areas of up to 100 kpc. Three galaxies appear unresolved, and in two others a nuclear point source dominates the emission in the central region. The morphologies of some of the lowest redshift targets are well represented by de Vaucouleurs proÐles, consistent with them being elliptical galaxies. Their average e †ective radius derived is a factor of 2 smaller than that of z D 1 3CR radio galaxies at similar rest-frame wavelength. The near-infrared continuum light is generally well aligned with the radio axis, and the aligned light is very red, with typical V [H colors of D3.5È4. For several galaxies, where WFPC2 V -or R-band images were available, we computed a high-resolution map of the optical-to-infrared spectral indices : all multicomponent systems present net color di †erences between the various clumps, and we argue that most probably the continuum emission has a stellar origin. Indicative ages of these stellar populations, as determined by the amplitude of the 4000 break A vary between 0.5 and 1.3 Gyr. Finally, in many of the small NICMOS frames we observe nearby faint objects close to the high-redshift radio galaxies. The number density of these faint objects is slightly higher than that observed in the deep NICMOS parallel observations of random Ðelds : furthermore, these objects tend to be aligned with the direction of the main axis of the radio sources, suggesting that they may be related to the presence of the AGN.

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“…Wegner et al (1996Wegner et al ( , 1999; c from the ROSAT Bright Source Catalogue (Fischer et al 1998;Schwope et al 2000); Key to the redshift references: (E, H) ESO-Key Programme; (S) South Galactic Pole Project (part of Ph.D. Thesis K.A. Romer); (1) Struble & Rood (1999); (2) Katgert et al (1996); (3) Katgert et al (1998); (4) Postman & Lauer (1995); (5) Lauberts & Valentijn (1989); (6) Ebeling et al (1996); (7) Bauer et al (2000); (8) Kapahi et al (1998); (9) The complete table is given in the electronic version of the paper, in the astro-ph/version and at our home page.…”

Section: Redshift Determinationmentioning

confidence: 99%

“…At the cluster redshift of z = 0.2037 the compact center could still be a bright compact cluster cooling core as well as a contaminating central AGN. Near the center (0.4 arcmin offset) is a radio source, PKS B1048-238 (MRC1048-238), at a redshift of z = 0.2060 (McCarthy et al 1996) and identified with a broad line radio galaxy Kapahi et al (1998). We expect that most of the X-ray emission is due to the cluster.…”

Section: Rxcj00143-6604 A2746 (Also Included In Xbacs)mentioning

confidence: 99%

The ROSAT-ESO Flux Limited X-ray (REFLEX) Galaxy cluster survey

Böhringer¹,

Schuecker²,

Guzzo

et al. 2004

A&A

612

667

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Abstract. We present the catalogue of the REFLEX Cluster Survey providing information on the X-ray properties, redshifts, and some identification details of the clusters in the REFLEX sample. The catalogue describes a statistically complete X-ray flux-limited sample of 447 galaxy clusters above an X-ray flux of 3 × 10 −12 erg s −1 cm −2 (0.1 to 2.4 keV) in an area of 4.24 ster in the southern sky. The cluster candidates were first selected by their X-ray emission in the ROSAT-All Sky Survey and subsequently spectroscopically identified in the frame of an ESO key programme. Previously described tests have shown that the sample is more than 90% complete and there is a conservative upper limit of 9% on the fraction of clusters with a dominant X-ray contamination from AGN. In addition to the cluster catalogue we also describe the complete selection criteria as a function of the sky position and the conversion functions used to analyse the X-ray data. These are essential for the precise statistical analysis of the large-scale cluster distribution. This data set is at present the largest, statistically complete X-ray galaxy cluster sample. Together with these data set we also provide for the first time the full three-dimensional selection function. The sample forms the basis of several cosmological studies, one of the most important applications being the assessment of the statistics of the large-scale structure of the universe and the test of cosmological models. Part of these cosmological results have already been published.

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The Molonglo Reference Catalog 1 Jy Radio Source Survey. II. Radio Structures of Galaxy Identifications

Cited by 63 publications

References 46 publications

Galaxy protocluster candidates at 1.6 < z ≲ 2

Galaxy protocluster candidates at 1.6 < z ≲ 2

NICMOS Observations of High‐Redshift Radio Galaxies: Witnessing the Formation of Bright Elliptical Galaxies?

The ROSAT-ESO Flux Limited X-ray (REFLEX) Galaxy cluster survey

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