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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 63 112 Source list and flux density values
table4 96 29 Radio and optical data for the optical
identifications.
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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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)
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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
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 21-Oct-1997