J/ApJS/202/2 VLA 1.4GHz observations of A370 and A2390 (Wold+, 2012)
Very Large Array 1.4 GHz catalogs of the A370 and A2390 cluster fields.
Wold I.G.B., Owen F.N., Wang W.-H., Barger A.J., Keenan R.C.
<Astrophys. J. Suppl. Ser., 202, 2 (2012)>
=2012ApJS..202....2W 2012ApJS..202....2W
ADC_Keywords: Clusters, galaxy ; Galaxies, radio ; Redshifts ; Radio continuum
Keywords: cosmology: observations
Abstract:
We present 1.4GHz catalogs for the cluster fields A370 and A2390
observed with the Very Large Array. These are two of the deepest radio
images of cluster fields ever taken. The A370 image covers an area of
40'x40' with a synthesized beam of ∼1.7" and a noise level of
∼5.7uJy near the field center. The A2390 image covers an area of
34'x34' with a synthesized beam of ∼1.4" and a noise level of
∼5.6uJy near the field center. We catalog 200 redshifts for the A370
field. We construct differential number counts for the central regions
(radius <16') of both clusters. We find that the faint
(S1.4GHz<3mJy) counts of A370 are roughly consistent with the
highest blank field number counts, while the faint number counts of
A2390 are roughly consistent with the lowest blank field number
counts. Our analyses indicate that the number counts are primarily
from field radio galaxies. We suggest that the disagreement of our
number counts can be largely attributed to cosmic variance.
Description:
We observed the A370 cluster field with the Very Large Array (VLA) in
the A configuration for ∼42.4hr on-source during 1999 August and
September. K. S. Dwarakanath observed A370 in the B configuration for
∼18.4hr on-source during 1994 August and September. The field center
is located at 02:39:32 -01:35:07 (J2000). This is offset by
approximately 5 arcmin from the cluster center at 02:39:50.5
-01:35:08.
We also targeted 58 radio sources, in A370, without existing spectral
data using the Hydra fiber spectrograph on the
Wisconsin-Indiana-Yale-NOAO (WIYN) telescope (spectral window of
∼4500-9500Å). We preferentially targeted optically bright
galaxies. We observed these data with a single two hour pointing on
2012 January 20. Of the 58 targets, we obtained high-confidence
redshifts for 36.
We observed the A2390 cluster field with the VLA in the A
configuration for ∼31.4hr on-source during 2008 October. Field
center is located at 21:53:36 +17:41:52 in J2000 coordinates.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 101 1223 Radio source catalog
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
J/ApJS/188/280 : Spectroscopic catalog in 24 clusters (Stern+, 2010)
J/MNRAS/397/281 : Radio imaging in Lockman Hole (Ibar+, 2009)
J/MNRAS/371/963 : Deep VLA survey (Biggs+, 2006)
J/MNRAS/372/741 : SXDF 100µJy catalogue (Simpson+, 2006)
J/MNRAS/358/233 : UBIc photometry of ACO2390 early-type galaxies (Fritz+, 2005)
J/A+A/407/791 : ACO 370, 2218 and 2390 fluxes at 7 and 15um (Metcalfe+, 2003)
J/AJ/126/119 : Optical and radio data for rich Abell clusters (Rizza+, 2003)
J/ApJ/533/611 : 1.4GHz survey in HDF region (Richards+, 2000)
J/ApJS/122/51 : Catalog of rich galaxy clusters (Dressler+ 1999)
J/MNRAS/238/1171 : Opt/IR observ. of Radio Galaxies and QSOs (Dunlop+, 1989)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ACO [370/2390] Abell Field (370 or 2390)
6- 8 I3 --- Seq [0/698] Catalog Source Number
10- 11 I2 h RAh Hour of Right Ascension (J2000)
13- 14 I2 min RAm Minute of Right Ascension (J2000)
16- 20 F5.2 s RAs Second of Right Ascension (J2000)
22- 26 F5.3 s e_RAs Error in RAs
28 A1 --- DE- Declination sign (J2000)
29- 30 I2 deg DEd Degree of Declination (J2000)
32- 33 I2 arcmin DEm Arcminute of Declination (J2000)
35- 39 F5.2 arcsec DEs Arcsecond of Declination (J2000)
41- 44 F4.2 arcsec e_DEs Error in DEs
46- 52 F7.1 --- S/N [3.5/57452.3] Peak Signal/Noise Ratio
54- 61 F8.1 uJy Stot [24.5/717950] Total flux density at 1.4GHz
63- 69 F7.1 uJy e_Stot Error in Stot
71- 74 F4.1 arcsec bmaj [0.5/89.2]? Fitted Deconvolved Gaussian major
axis FWHM
76- 79 F4.1 arcsec bmin [0/22.3]? Fitted Deconvolved Gaussian minor axis
FWHM
81- 83 I3 deg PA ? Fitted position angle
85- 88 F4.1 arcsec ulim [0.2/14.8]? bmaj-upper limit for unresolved
sources (1)
90- 92 F3.1 arcsec beam [1.4/6] Map beam size
94- 99 F6.4 --- z [0.0286/3.8219]? A370 only Spectroscopic redshift
101 I1 --- r_z [1/5]? A370 only Redshift reference (2)
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Note (1): Or maximum size for very resolved sources.
Note (2): References as follows:
1 = L. Cowie, private communication;
2 = F. Owen, private communication;
3 = Keenan et al. 2012, Submitted;
4 = Dunlop et al. 1989, Cat. J/MNRAS/238/1171;
5 = Wold et al. 2012, Cat. J/ApJS/202/2 (this paper).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Oct-2012