The Molonglo Reference Catalogue of Radio Sources

Large, M. I.; Mills, B. Y.; Little, A. G.; Crawford, David F.; Sutton, J.

doi:10.1093/mnras/194.3.693

Cited by 325 publications

(266 citation statements)

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“…MRC 0156-252 was first reported in Large et al (1981) as part of the Molonglo Reference Catalogue of Radio Sources. 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.…”

Section: Mrc 0156-252mentioning

confidence: 99%

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: 99%

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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“…The spectral indices α below and α above were determined by fitting high-and low-frequency region of the spectra with a liner function in the log-log scale. Where a more accurate measurement of lowfrequency spectral index and peak frequency was necessary, we used measurements of other authors at the frequencies 74, 80, 151, 178, 232, 318, 325, 365, and 408 MHz (Cohen et al 2007;Pauliny-Toth et al 1978;Stanghellini et al 1998;Wright & Otrupcek 1990;Zhang et al 1997;Kuehr et al 1981;Rengelink et al 1997;Douglas et al 1996;Large et al 1981).…”

Section: Sample and Observationsmentioning

confidence: 99%

Multifrequency study of GHz-peaked spectrum sources and candidates with the RATAN-600 radio telescope

Мингалиев

Sotnikova

Torniainen

et al. 2012

A&A

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Context. Gigahertz peaked spectrum (GPS) radio sources are a class of extragalactic radio sources characterized by a spectral peak in the gigahertz domain. They are a mixed class of quasars and galaxies. A large proportion of the sources studied in the literature have only few data points in the radio domain, and the determination of variability and shape of the simultaneous spectra is inadequate. Sources currently included in the GPS source lists are very heterogeneous. Aims. We present the observational results from 12 observing campaigns (carried out between 2006 and 2010) at the RATAN-600 radio telescope to obtain the simultaneous radio spectra, which is valuable and necessary to derive genuine GPS sources from flatspectrum radio sources caught in a flaring state when their spectra are temporarily inverted. The sample contains both quasar-and galaxy-type GPS (122 sources) identified in the literature. Methods. The observations were carried out at six frequencies (1.1, 2.3, 4.8, 7.7, 11.2 and 21.7 GHz). The flux densities were measured at several epochs. A six-frequency broadband radio spectrum was obtained by observing simultaneously with an accuracy of up to a minute at 1.4, 2.7, 3.9, 6.25, 13, and 30 cm. Results. The original GPS source samples were highly contaminated. Finally, we selected 29% GPS source candidates within the sample. We found some difference in spectral properties between GPS galaxies and quasars within the sample. The GPS galaxies demonstrate a steeper spectral index in the optically thin part of the spectra. There are only relatively few (17) sources whose radio spectra strictly agree with the spectra of homogeneous self-absorbed synchrotron sources. The narrowest radio spectra are found in both ultra-high-z (z ≥ 1.8) and low-z (0.02 ≤ z ≤ 0.7, FWHM ∼ 0.9) convex spectrum radio sources. The majority of quasars within this sample should be considered as flat-spectrum radio sources with a temporarily inverted spectrum, and not as genuine GPS sources. The number of truly convex-spectrum sources remains low, and the lists of GPS sources should accordingly be revised.

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“…We searched the literature for flux density measurements at 408 MHz for these 97 sources. If such measurements were unavailable, we used the radio spectrum or unpublished Molonglo 408 MHz Day et al 1966; (7) Shimmins et al 1966;(8) Shimmins & Day 1968;(9) Bolton et al 1979 and references therein; (10) Large et al 1981;(11) Griffith et al 1994;(12) Wright et al 1994;(13) Griffith et al 1995;(14) Wright et al 1996. data. As a result of these estimates, described in x 2.3, 20 extended sources were added to the sample, bringing the total number of sources to 228.…”

Section: Initial Selection Of the Samplementioning

confidence: 99%

The Molonglo Southern 4 Jy Sample (MS4). I. Definition

Burgess

Hunstead

2006

Astron J

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We have defined a complete sample of 228 southern radio sources at 408 MHz with integrated flux densities S 408 > 4:0 Jy, Galactic latitude jbj > 10 , and declination À85 < < À30 . The main finding survey used was the Molonglo Reference Catalogue. We describe in detail how the Molonglo Southern 4 Jy sample (MS4) was assembled and its completeness assessed. Sources in the sample were imaged at 843 MHz with the Molonglo Observatory Synthesis Telescope to obtain positions accurate to about 1 00 , as well as flux densities and angular sizes; follow-up radio and optical observations are presented in Paper II. Radio spectra for the MS4 have been compiled from the literature and used to estimate flux densities at 178 MHz. The strong-source subset of MS4, with S 178 > 10:9 Jy (SMS4), provides a southern sample closely equivalent to the well-studied northern 3CRR sample. Comparison of SMS4 with 3CRR shows a reassuring similarity in source density and median flux density between the two samples.

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The Molonglo Reference Catalogue of Radio Sources

Cited by 325 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

Multifrequency study of GHz-peaked spectrum sources and candidates with the RATAN-600 radio telescope

The Molonglo Southern 4 Jy Sample (MS4). I. Definition

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