J/MNRAS/391/297 Radio Survey of 7 X-ray Clusters of Galaxies (Slee+, 2008)
A radio survey of seven southern X-ray luminous clusters of galaxies.
Slee O.B., Andernach H., McIntyre V.J., Tsarevsky G.S.
<Mon. Not. R. Astron. Soc. 391, 297 (2008)>
=2008MNRAS.391..297S 2008MNRAS.391..297S
ADC_Keywords: Clusters, galaxy ; Galaxies, radio; Galaxies, optical;
Radio sources; Surveys
Keywords: galaxies: clusters - surveys: clusters - optical identification -
radio continuum: general
Abstract:
The Australia Telescope Compact Array (ATCA) has been used at 1.38 and
2.38GHz to survey seven southern Abell clusters of galaxies with high
X-ray luminosities: A2746, A2837, A3126, A3216, A3230, A3827 and
A3836. The clusters have also been surveyed at 0.843GHz with the
Molonglo Observatory Synthesis Telescope (MOST). We have listed a
complete 1.38-GHz sample of 149 radio sources within the Abell circles
centred on their X-ray centroids. We compare their identification
fractions, emitted 1.38-GHz and optical powers, radio spectral indices
and radial variation in projected source density with those of the
radio-selected samples of Slee et al. (1998AuJPh..51..971S 1998AuJPh..51..971S). We
compare our fractional radio luminosity function with that of the
radio-selected samples of Ledlow and Owen (1996AJ....112....9L 1996AJ....112....9L) and
Slee et al. (1998AuJPh..51..971S 1998AuJPh..51..971S). Three significant differences are
noted between X-ray and radio-selected samples of clusters; (1) the
X-ray sample has an excess of flat-spectrum radio sources; (2) the
fractional radio luminosity function for the FR I sources in the X-ray
selected sample is much steeper, implying that fewer of their cluster
galaxies become hosts for the stronger FR I radio galaxies; (3) a
complete absence of FR II radio galaxies in the X-ray selected sample.
The average excess projected density of radio sources near our cluster
centres is approx. 5 times the background source density.
Description:
For each of 149 radio sources, detected in seven southern Abell
clusters of galaxies, we give the catalogue ID, Right ascension and
Declination (equinox J2000), flux densities and errors at 0.843, 1.38
and 2.38GHz, the radio spectral index and shape, radio extent and
orientation and cross-identification, if available. We also searched
for optical identifications of these radio sources on sky survey
images and list BJ and R magnitudes, radio-optical offsets,
literature redshifts (when available) for 67 identifications, together
with the corresponding radio powers and absolute red magnitudes,
assuming cluster membership.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
00 14 18.4 -66 04 39 Abell 2746 = ACO 2746
00 52 44.9 -80 15 59 Abell 2837 = ACO 2837
03 28 37.5 -55 42 46 Abell 3126 = ACO 3126
04 04 07.0 -65 12 32 Abell 3216 = ACO 3216
04 11 20.4 -63 41 46 Abell 3230 = ACO 3230
22 01 56.0 -59 56 58 Abell 3827 = ACO 3827
22 09 23.3 -51 48 54 Abell 3836 = ACO 3836
------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 149 164 Radio sources detected in the seven cluster fields
tablea2.dat 67 77 Optical IDs, radio powers, absolute magnitudes
notes.dat 80 161 Notes on individual sources
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- [SAM2008] Source name (1)
13- 14 I2 h RAh Right ascension of radio centroid (J2000.0)
16- 17 I2 min RAm Right ascension of radio centroid (J2000.0)
19- 23 F5.2 s RAs Right ascension of radio centroid (J2000.0)
25 A1 --- DE- Declination sign (J2000.0)
26- 27 I2 deg DEd Declination of radio centroid (J2000.0)
29- 30 I2 arcmin DEm Declination of radio centroid (J2000.0)
32- 35 F4.1 arcsec DEs Declination of radio centroid (J2000.0)
38- 41 F4.2 --- rRa Projected angular distance between source and
cluster centre in units of Abell radii
43 A1 --- l_F0.84 Limit flag on 843MHz integrated flux density
44- 48 F5.1 mJy F0.84 ? Integrated 843MHz flux density
50- 53 F4.1 mJy e_F0.84 ? Error of integrated 843MHz flux density
55 A1 --- l_F1.38 Limit flag on 1.38GHz integrated flux density
56- 61 F6.2 mJy F1.38 ? Integrated 1.38GHz flux density
63- 67 F5.2 mJy e_F1.38 ? Error of integrated 1.38GHz flux density
69 A1 --- l_F2.38 Limit flag on 2.38GHz integrated flux density
70- 75 F6.2 mJy F2.38 ? Integrated 2.38GHz flux density
77- 80 F4.2 mJy e_F2.38 ? Error of integrated 1.38GHz flux density
82 A1 --- l_alpha Limit flag on radio spectral index
83- 88 F6.3 --- alpha ? Radio spectral index (2)
89 A1 --- u_alpha Uncertainty flag on alpha
91- 94 F4.3 --- e_alpha ? Error of radio spectral index
96- 98 A3 --- Shape Shape of radio spectrum (3)
100-103 F4.1 arcsec majax ? Size of source major axis (deconvolved) (4)
105-108 F4.1 arcsec minax ? Size of source minor axis (deconvolved) (4)
110-112 I3 deg PA ? Position angle of major axis (N thru E) (5)
114-149 A36 --- Note Textual comment or cross-identification (6)
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Note (1): Composed of the Abell cluster name, followed by a sequence
number; for multiple component sources we list both individual
components (a and b), as well as integrated parameters (a/b).
Note (2): Spectral index alpha based on convention F∝να;
see paper text on the data used to determine alpha
Note (3): Sphape of radio spectrum code as follows:
C- = convex spectrum (steepening with increasing frequency)
C+ = concave spectrum (flattening with increasing frequency)
Cpx = complex
? = uncertain
blank if spectrum is indistinguishable from a power law
Note (4): Deconvolved major and minor axis of an elliptical fit to the
source from either the 1.38 or the 2.38-GHz maps, see Sect. 3.2; for
double sources (a/b) this is the angular separation between component
positions.
Note (5): for double sources (a/b) this is the position angle of the vector
from the stronger (a) to the weaker (b) component.
Note (6): References to acronyms are as follows:
MRC = Large et al., 1991Obs...111...72L 1991Obs...111...72L, Cat. VIII/16
MC4 = Clarke et al., 1976AuJPA..40....1C 1976AuJPA..40....1C
PMN = Wright et al., 1994ApJS...91..111W 1994ApJS...91..111W, Cat. VIII/38
PMNM = Gregory et al., 1994ApJS...90..173G 1994ApJS...90..173G, Cat. J/ApJS/90/173
PMNAT = Wright et al. (1997, ftp.atnf.csiro.au/pub/data/pmn/CA)
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- [SAM2008] Source name (1)
13- 16 A4 --- OMorph Optical morphology of most likely ID (2)
18- 22 F5.2 mag Bjmag ? Blue (Bj) magnitude from SERC plates (3)
23 A1 --- u_Bjmag [?] Uncertainty flag for Bjmag (4)
25- 29 F5.2 mag Rmag ? UK Schmidt red magnitude (5)
30 A1 --- u_Rmag [?] Uncertainty flag for Rmag (4)
32- 33 I2 arcsec offRO ? Positional offset of opt. ID with respect
to radio centroid
36- 38 I3 deg offPA ? Position angle of vector from radio centroid
to opt. ID (positive N through E)
41- 45 F5.4 --- zLG ? Galactocentric redshift of opt. ID (6)
47- 49 A3 --- r_zLG Reference code for z_LG (7)
52- 56 F5.2 [W/Hz] logP1.38 ? log of radio power at 1.38 GHz in W/Hz (8)
58- 63 F6.2 mag Mabs ? Absolute red magnitude of optical ID (8)
65 A1 --- Mem Cluster membership flag (9)
67 A1 --- Note [*] * indicates a note listed in notes.dat
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Note (1): Composed of the Abell cluster name, followed by a sequence
number; Double sources are listed only with one entry for the
integrated source.
Note (2): Optical morphology code as follows:
St = stellar
G = galaxy of unknown type
E = elliptical galaxy
S0 = S0 galaxy
Sp = spiral galaxy
D = D galaxy
cD = cD galaxy
2xE = two adjacent elliptical galaxies
B = blank field
Note (3): From SuperCOSMOS database.
Note (4): ? indicates a bright object but an unreliable value of Bj or R.
Note (5): listed as R1 in the SuperCOSMOS database.
Note (6): zLG(km/s)=c*zhel+300sinl*cosb, where l and b are Galactic
coordinates, and zhel is the heliocentric redshift.
Note (7): References as follows:
1 = Lucey et al., 1983MNRAS.203..545L 1983MNRAS.203..545L
2 = Colless & Hewett, 1987MNRAS.224..453C 1987MNRAS.224..453C
3 = Jones et al., 2004MNRAS.355..747J 2004MNRAS.355..747J
4 = Katgert et al., 1998A&AS..129..399K 1998A&AS..129..399K.
5 = de Grijp et al., 1992A&AS...96..389D 1992A&AS...96..389D
6 = Ebeling (1997), priv. comm.
Note (8): Both logP1.38 and Mabs assume the optical ID to be a cluster
member with redshift as indicated in Table 1.
Note (9): 'n' means that while logP1.38 and Mabs are based on the cluster
redshift, the ID is not considered a cluster member.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- [SAM2008] Source sequential number
13- 80 A68 --- Text Text of the note
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Acknowledgements:
Heinz Andernach, heinz(at)astro.ugto.mx
History:
Erratum published in MNRAS 394, 1120 (2009).
(End) Heinz Andernach [Universidad de Guanajuato, Mexico] 02-Oct-2008