2003MNRAS.341....1M


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.17CEST23:44:04

2003MNRAS.341....1M - Mon. Not. R. Astron. Soc., 341, 1-12 (2003/May-1)

The Cosmic Lens All-Sky Survey - I. Source selection and observations.

MYERS S.T., JACKSON N.J., BROWNE I.W.A., DE BRUYN A.G., PEARSON T.J., READHEAD A.C.S., WILKINSON P.N., BIGGS A.D., BLANDFORD R.D., FASSNACHT C.D., KOOPMANS L.V.E., MARLOW D.R., McKEAN J.P., NORBURY M.A., PHILLIPS P.M., RUSIN D., SHEPHERD M.C. and SYKES C.M.

Abstract (from CDS):

The Cosmic Lens All-Sky Survey (CLASS) is an international collaborative programme which has obtained high-resolution radio images of over 10000 flat-spectrum radio sources in order to create the largest and best-studied statistical sample of radio-loud gravitationally lensed systems. With this survey, combined with detailed studies of the lenses found therein, constraints can be placed on the expansion rate, matter density and dark energy (e.g. cosmological constant, quintessence) content of the Universe that are complementary to and independent of those obtained through other methods. CLASS is aimed at identifying lenses where multiple images are formed from compact flat-spectrum radio sources, which should be easily identifiable in the radio maps. Because CLASS is radio-based, dust obscuration in lensing galaxies is not a factor, and the relative insensitivity of the instrument to environmental conditions (e.g. weather, `seeing') leads to nearly uniform sensitivity and resolution over the entire survey. In four observing `seasons' from 1994 to 1999, CLASS has observed 13783 radio sources with the Very Large Array (VLA) at 8.4 GHz in its largest `A'-configuration (0.2-arcsec resolution). When combined with the Jodrell Bank VLA Astrometric Survey (JVAS), the CLASS sample contains over 16000 images. A complete sample of 11685 sources was observed, selected to have a flux density of at least 30 mJy in the Green Bank Survey (GB6) catalogue at 4.85 GHz (spanning the declination range 0°≤δ≤ 75° and|b|≥ 10°, excluding the Galactic plane) and a spectral index α≥-0.5 between the NRAO-VLA Sky Survey (NVSS) at 1.4 GHz and the GB6. A typical 30-s CLASS snapshot reached an rms noise level of 0.4 mJy. So far, CLASS has found 16 new gravitational lens systems, and the JVAS/CLASS survey contains a total of 22 lenses. The follow-up of a small number of candidates using the VLA, MERLIN, the Very Long Baseline Array (VLBA) and optical telescopes is still underway. In this paper, we present a summary of the CLASS observations, the JVAS/CLASS sample, and statistics on sub-samples of the survey. An accompanying paper presents the lens candidate selection, and in a third paper the implications for cosmology are discussed.

Abstract Copyright: 2003 RAS

Journal keyword(s): gravitational lensing - cosmology: observations

VizieR on-line data: <CDS Catalogue: VIII/72>

Nomenclature: Table 3: CLASS JHHMMSS.ssss+DDMMSS.sss N=23418.

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 CLASS B0128+437 Rad 01 31 +44.0           ~ 56 0
2 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2594 2
3 QSO B0218+357 QSO 02 21 05.5 +35 56 14   20.0 20.0 19.60   ~ 515 2
4 4C 05.19 QSO 04 14 37.7673624 +05 34 42.328449   24.100 23.800 21.270   ~ 338 2
5 CLASS B0445+123 G 04 48 +12.4           ~ 23 0
6 CLASS B0631+519 G 06 35 +51.9           ~ 21 0
7 QSO B0712+472 QSO 07 16 03.65 +47 08 50.6     23.0     ~ 106 1
8 CLASS B0739+366 LeQ 07 42 51 +36 34.7           ~ 18 0
9 [VV2006] J083105.4+522520 QSO 08 31 05.4 +52 25 21     19.60     ~ 13 3
10 CLASS B0850+054 G 08 53 +05.2           ~ 25 0
11 QSO B1030+074 QSO 10 33 34.02429 +07 11 26.1478     20.34 20.22   ~ 101 1
12 NVSS J113000+381203 Rad 11 30 00.110 +38 12 03.23           ~ 31 0
13 [VV2000] J115518.3+193942 QSO 11 55 18.3 +19 39 42   17.15 16.89     ~ 87 2
14 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3878 2
15 QSO B1359+154 QSO 14 01 35.588 +15 13 24.15     21.90     ~ 70 1
16 QSO B1422+2309 BLL 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 425 1
17 [PBW92] 1422+231 gLS 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 355 0
18 CLASS B1555+375 LeQ 15 57 11.884 +37 21 35.80           ~ 44 0
19 QSO B1600+4344 QSO 16 01 40.4818 +43 16 47.394   22.12 21.92     ~ 178 1
20 NVSS J160914+653229 rG 16 09 13.96 +65 32 28.8     19.4     ~ 194 1
21 CLASS B1933+503 Rad 19 34 31.02 +50 25 23.5           ~ 83 1
22 BWE 1938+6641 gLe 19 38 25.32029 +66 48 53.4199           ~ 94 2
23 [VV2000] J204719.3+264340 QSO 20 47 20.3 +26 44 03     20.60     ~ 108 2
24 GB6 B2108+2118 gLS 21 10 53.30 +21 31 09.0           ~ 26 0
25 PKS J2116+0225 Rad 21 16 50.7449472 +02 25 46.270365           ~ 56 2
26 CLASS B2319+051 Rad 23 21 40.801 +05 27 37.23           ~ 28 1

    Equat.    Gal    SGal    Ecl

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