The MIT-Green Bank (MG) 5 GHz survey

Bennett, C. L.; Lawrence, C. R.; Burke, B. F.; Hewitt, J. N.; Mahoney, J.

doi:10.1086/191108

Cited by 90 publications

(67 citation statements)

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“…(5) Wright et al (1994Wright et al ( , 1996; Griffith et al (1994Griffith et al ( , 1995. (6) Bennett et al (1986); Langston et al (1990); Griffith et al (1990Griffith et al ( , 1991. (7) Otrupcek & Wright (1991).…”

Section: Resultsmentioning

confidence: 99%

The precision of large radio continuum source catalogues

Vollmer

Davoust

Dubois³

et al. 2005

A&A

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Abstract. The accuracy in position and flux density of 19 large radio continuum source catalogues has been determined using SPECFIND, a new tool recently made available through the CDS. The ∼67 000 radio continuum spectra with three or more frequencies produced by SPECFIND were used to cross-correlate sources from different catalogues and to calculate offsets in right ascension and declination in the various catalogues with respect to the positions given in the NRAO VLA Sky Survey (NVSS) catalogue, which was adopted as a reference. The flux densities reported in the catalogues were compared to those predicted by the composite spectra, enabling us to assess the quality of the flux density calibration of the different catalogues.

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Section: Resultsmentioning

confidence: 99%

The precision of large radio continuum source catalogues

Vollmer

Davoust

Dubois³

et al. 2005

A&A

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“…For each source we have collected, from the literature, the radio continuum flux, when available. The main bibliographic sources used are Caswell & Haynes (1987), PMN (Wright et al 1994;Griffith et al 1993Griffith et al , 1995 and GB6 (Griffith et al 1990(Griffith et al , 1991Langston et al 1990;Bennett et al 1986) catalogues. The excitation parameter for each complex is then calculated from the excitation parameter of the individual sources composing it.…”

Section: The Excitation Parametermentioning

confidence: 99%

Star-forming complexes and the spiral structure of our Galaxy

Russeil¹

2002

A&A

459

598

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Abstract.We have carried out a multiwavelength study of the plane of our Galaxy in order to establish a star-forming-complex catalogue which is as complete as possible. Features observed include Hα, H109α, CO, the radio continuum and absorption lines. For each complex we have determined the position, the systemic velocity, the kinematic distance and, when possible, the stellar distance and the corresponding uncertainties. All of these parameters were determined as homogeneously as possible, in particular all the stellar distances have been (re)calculated with the same calibration and the kinematic distances with the same mean Galactic rotation curve. Through the complexes with stellar distance determination, a rotation curve has been fitted. It is in good agreement with the one of Brand & Blitz (1993). We also investigated the residual velocities relative to the circular rotation model. We find that departures exist over large areas of the arms, with different values from one arm to another. From our data and in good agreement with previous studies, the Galactic warp is observed. It does not seem correlated with the departures from circular rotation. Finally, as segment-like features are noted from the complexes' distribution, we tried to find if they are indicative of a larger underlying structure. Then, we attempted to interpret the complexes' distribution in terms of spiral structure by fitting models with two, three and four logarithmic spiral arms. The four-arm model seems more appropriate to represent the grand design of our Galaxy. In this model the Norma arm and the external arm appear as being the two extremities of a single arm called the Norma-Cygnus arm. The new data and fitted model confirm the four-segment model of Georgelin & Georgelin (1976), clarifying the arms' design and extension and doubling their known length.

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“…In order to test this idea, we compared the Effelsberg 4.85 GHz (6 cm) flux density to a corresponding 4.85 GHz flux density in SPECFIND whenever that is available (121 sources of our sample). The SPECFIND used 4.85 GHz flux densities obtained with angular resolutions of 3.5 and 2.8 (Gregory et al 1996;Gregory & Condon 1991;Becker et al 1991;Wright et al 1994Wright et al , 1996Griffith et al 1994Griffith et al , 1995Bennett et al 1986;Langston et al 1990;Griffith et al 1990Griffith et al , 1991), compared to the Effelsberg 100-m telescope resolution of 2.4 . Therefore, extended or confused sources observed with these different beam sizes can also lead to differences between the Effelsberg and the SPECFIND fluxes.…”

Section: Extended Sources and Variabilitymentioning

confidence: 99%

Quasi-simultaneous multi-frequency observations of inverted-spectrum GPS candidate sources

Vollmer

Krichbaum

Angelakis

et al. 2008

A&A

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Context. Gigahertz-Peaked Spectrum (GPS) sources are likely the precursors of local radio galaxies. Existing GPS source samples are small (<200). Aims. We aim to extend the available sample of the Gigahertz-Peaked Spectrum (GPS) and High Frequency Peaker (HFP) sources in order to study their nature with greater detail and higher statistical significance. Methods. A sample of 214 radio sources, which were extracted from the SPECFIND catalog and show an inverted radio spectrum, were observed quasi-simultaneously at 4.85, 10.45, and 32 GHz with the 100-m Effelsberg radio telescope. Using the VLBA calibrator survey (VCS) we have investigated the parsec-scale morphology of the sources. Results. About 45% of the sources in our sample are classified as GPS or HFP candidates. We add 65 new GPS/HFP candidates to existing samples. We confirm the expected tendency that HFP are more compact on a milliarcsecond scale than the "classical" GPS sources, which peak at lower frequencies. Conclusions. The data mining of the SPECFIND database represents a promising tool for the discovery of new GPS/HFP sources.

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The MIT-Green Bank (MG) 5 GHz survey

Cited by 90 publications

References 0 publications

The precision of large radio continuum source catalogues

The precision of large radio continuum source catalogues

Star-forming complexes and the spiral structure of our Galaxy

Quasi-simultaneous multi-frequency observations of inverted-spectrum GPS candidate sources

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