J/MNRAS/285/898 A3556 radio properties (Venturi+ 1997)
Radio properties of the Shapley Concentration - I. The Abell cluster A3556 Venturi T., Bardelli S., Morganti R., Hunstead R.W. <Mon. Not. R. Astron. Soc. 285, 898 (1997)> =1997MNRAS.285..898V (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Radio sources Keywords: galaxies: clusters: individual: Abell 3556 - radio continuum: galaxies Abstract: We have imaged the portion of the Shapley Concentration core surrounding the cluster A3556 at wavelengths of 36cm with the Molonglo Observatory Synthesis Telescope (MOST), and at 22 and 13cm with the Australia Telescope Compact Array (ATCA). We have defined a radio sample of 112 radio sources at 22cm. Cross-correlation with optical catalogues allowed the identification of 29 radio sources, nine of which belong to A3556. The radio and optical properties of A3556 have been studied in detail. Two extended radio sources are associated with cluster members, i.e. a narrow-angle-tail source located at a projected distance of 0.06RA from the centre, possibly in the late stages of its existence, and a wide-angle-tail source at the periphery of the cluster. We also performed a statistical analysis of the cluster properties. The optical luminosity function shows that the cluster has an excess of bright optical galaxies. In agreement with well-established results, we found that the probability of radio emission increases for brighter galaxies. Furthermore, our radio luminosity function and those obtained for elliptical galaxies located in different environments (poor groups and rich clusters) are very similar, implying that the peculiar dynamical state of A3556 has no influence on the radio emission properties of the cluster galaxies. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3 63 112 Source list and flux density values table4 96 29 Radio and optical data for the optical identifications.
Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 10 A10 --- Name Source name 11 A1 --- m_Name [ab] Multiplicity index on Name 15- 16 I2 h RAh Right ascension (J2000) 18- 19 I2 min RAm Right ascension (J2000) 21- 24 F4.1 s RAs Right ascension (J2000) 27 A1 --- DE- Declination sign 28- 29 I2 deg DEd Declination (J2000) 31- 32 I2 arcmin DEm Declination (J2000) 34- 35 I2 arcsec DEs ? Declination (J2000) 37- 41 F5.1 mJy S22cm 22cm flux density (1.4GHz) 44- 47 F4.1 mJy S13cm ? 13cm flux density (2.3GHz) 49- 53 F5.1 mJy S36cm ? 36cm flux density (0.83GHz) 55- 62 A8 --- Morph Radio morphology (1) 63 A1 --- n_Morph [a] Note on Morph (2)
Note (1): The morphologies refer to the 22-cm mosaic map. D* indicates that the source is a double, and the position given is that of the radio barycentre. Note (2): a: this source was detected in the large 1.5D map, but it is out of the final mosaic map.
Byte-by-byte Description of file: table4
Bytes Format Units Label Explanations
1- 10 A10 --- Name Radio name 12- 13 I2 h RAh Radio right ascension (J2000) 15- 16 I2 min RAm Radio right ascension (J2000) 18- 21 F4.1 s RAs Radio right ascension (J2000) 23 A1 --- DE- Radio declination sign 24- 25 I2 deg DEd Radio declination (J2000) 27- 28 I2 arcmin DEm Radio declination (J2000) 30- 31 I2 arcsec DEs ? Radio declination (J2000) 33- 36 F4.1 mJy S22cm 22cm flux density 38- 43 A6 --- radType Radio type (1) 45- 48 F4.2 arcsec DRO ? Difference between radio and optical centres 49 A1 --- n_DRO [*] When *, see note (3) 51- 56 A6 --- OName Optical name 58- 59 I2 h RAoh Optical right ascension (J2000) 61- 62 I2 min RAom Optical right ascension (J2000) 64- 67 F4.1 s RAos Optical right ascension (J2000) 69 A1 --- DEo- Optical declination sign 70- 71 I2 deg DEod Optical declination (J2000) 73- 74 I2 arcmin DEom Optical declination (J2000) 76- 77 I2 arcsec DEos Optical declination (J2000) 79- 83 F5.2 mag Bjmag Apparent bJ magnitude 84 A1 --- n_Bjmag Note on Bjmag (2) 86- 87 A2 --- optType Optical type 89- 93 I5 km/s Vel ? Recession velocity 94 A1 --- n_Vel [Q] Q: Velocities taken from Quintana et al. (1995, Cat. J/AJ/110/463). 95 A1 --- Note [*] When *, see note (3)
Note (1): *: stellar appearance; classified as star in the COSMOS catalogue. +: flagged in the COSMOS catalogue as too 'faint'. Note (2): D stands for double radio morphology (see also Table 3), E for elliptical galaxy. Note (3): Individual notes: J1321-3042: This radio source was detected in the 1.5D map, owing to the large field. It is out of the final mosaic map. J1321-3130: The source is the edge of our mosaic map, therefore uncertainties in the image could be larger than in the rest of the field. The appearance is that of a classical double source with a optical object between the two components. The radio position is that of the radio barycentre. J1322-3114: Classical double source (FRII) with an object between the two components. J1322-3128: Classical double source (FRI/II) with a faint object between the two components. J1323-3150: Very extended optical galaxy, see Section 5 in the text. J1324-3138: Extended radio source discussed in section 6.1
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 21-Oct-1997
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