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CLASS B1152+199, a double image gravitational lens



Lens System Summary

VLBI observations have revealed core-jet structure in both radio images. The lensed object is a bright quasar at z = 1.019. It has been detected as an X-ray source in the Northern ROSAT All-Sky Survey (Brinkman et al. 1997). HST pictures have located the lensing galaxy and a faint companion.

This Lens System

Lens name B1152+199
Survey CLASS
Images 2
B1950.0 coords 11h52m43.914s 19°56'24.010"
J2000.0 coords 11h55m18.297s 19°39'42.230"

Lens System Structure and Labelling

Image labelling for this lens (RA increases to the left, declination increases upwards)

Images labelled as in Myers et al.

Image/Lens Positions

Image/Lens Relative Position
East (mas) North (mas)
A +0.0 +0.0
Acore +0.0 +0.0
Ajet +11.5±0.1 +0.6±0.1
B +935±5 -1248±50
Bcore +935.3±0.1 -1245.4±0.1
Bjet 939.4±0.1 -1249.4±0.1
C -23085±36 -144±38
G +554±10 -991±10
X -37±10 -1046±10

Image/Lens Separations

Separation (mas)
Component A Acore Ajet B Bcore Bjet C G X
A
0.0 11.5 1559.4 1557.5 1563.2 23085.4 1135.3 1046.7
Acore 0.0
11.5 1559.4 1557.5 1563.2 23085.4 1135.3 1046.7
Ajet 11.5 11.5
1553.0 1551.1 1556.8 23097.0 1130.3 1047.7
B 1559.4 1559.4 1553.0
2.6 4.6 24045.4 459.6 992.8
Bcore 1557.5 1557.5 1551.1 2.6
5.7 24045.5 458.4 992.5
Bjet 1563.2 1563.2 1556.8 4.6 5.7
24049.8 464.0 997.4
C 23085.4 23085.4 23097.0 24045.4 24045.5 24049.8
23654.2 23065.6
G 1135.3 1135.3 1130.3 459.6 458.4 464.0 23654.2
593.6
X 1046.7 1046.7 1047.7 992.8 992.5 997.4 23065.6 593.6
Position angle (°)
Component A Acore Ajet B Bcore Bjet C G X
A
0.0 -93.0 -36.8 -36.9 -36.9 89.6 -29.2 2.0
Acore 0.0
-93.0 -36.8 -36.9 -36.9 89.6 -29.2 2.0
Ajet 87.0 87.0
-36.5 -36.6 -36.6 89.6 -28.7 2.7
B 143.2 143.2 143.5
-173.4 -72.3 92.6 124.0 101.7
Bcore 143.1 143.1 143.4 6.6
-45.7 92.6 123.7 101.6
Bjet 143.1 143.1 143.4 107.7 134.3
92.6 123.8 101.8
C -90.4 -90.4 -90.4 -87.4 -87.4 -87.4
-87.9 -87.8
G 150.8 150.8 151.3 -56.0 -56.3 -56.2 92.1
84.7
X -178.0 -178.0 -177.3 -78.3 -78.4 -78.2 92.2 -95.3

Maps and Images

Click on an image to see a larger JPEG version, or click on the accompanying text to download a gzipped FITS or PostScript file of the map or image. The images and maps are available in one gzipped file here. To see a DSS image of the region around this lens, click here - note that you will have to start the search manually by clicking on the 'Search' button.

Optical and IR images Click to see a larger version
HST I-band image
Rusin et al.
Click to see a larger version
HST V-band image
Rusin et al.
MERLIN maps Click to see a larger version
MERLIN 5GHz image
VLBA maps Click to see a larger version
VLBA 1.7GHz image, component A
Click to see a larger version
VLBA 1.7GHz image, component B

Radio Flux Densities

Component Flux density (mJy)
1.4 GHz 5 GHz 5 GHz 8.4 GHz 8.4 GHz 15 GHz 15 GHz
A 50.8±0.4 55.2±0.1
52.27 48.5±0.1 43.78 43.0±0.3
Acore

33.4±0.2



Ajet

17.1±0.1



B 17.1±0.4 18.6±0.1
17.23 15.6±0.1 14.34 14.5±0.3
Bcore

11.9±0.1



Bjet

5.0±0.1



C


2.34
1.20
Flux errors


3%
5%
Resolution (mas)
67
210
210
Map noise level
(mJy/beam)

0.070 0.075 0.16 0.1 0.25 0.3
Instrument VLA MERLIN VLBA VLA VLA VLA VLA
Date observed 1999/07/15 1999/01/02
1999/01/05
2001/02/27
2001/03/18
1998/04/03 1999/07/15 1998/04/05 1999/07/15
Reference [4] [4] [4] [1] [4] [1] [4]

Sub-millimetre Flux Densities

Component Flux density (mJy)
850 μm 450 μm
Total <6.5 <70
Estimated
cal. error
5-10% 5-10%
Instrument SCUBA (JCMT) SCUBA (JCMT)
Date observed 1999-2001 1999-2001
Reference [5] [5]

Optical Imaging

Component Brightness (Magnitudes)
i g U B V V R R I I z'
A 16.6 16.5 16.75±0.04 17.00±0.02 17.28±0.03 <17.3 16.42±0.02
16.38±0.02 <16.7
B



21.73±0.03 21.9±0.3 20.20±0.04
19.26±0.03 19.9±0.3
G




22.6±0.3


19.6±0.3
X




25.0±0.3


23.1±0.3
Bmag - Amag





19.61±0.04
19.18±0.04

Gmag - Amag






4.1±0.2


Instrument COSMIC (Palomar 5-m) COSMIC (Palomar 5-m) ALFOSC (NOT) ALFOSC ALFOSC WFPC2 (HST) ALFOSC OIG (3.5-m TNG) ALFOSC WFPC2 (HST) ALFOSC
Integration time

2700 sec 1500s 1000s 4 exp. of
500s each
600s 1320 sec in 5 exp. 600s 4 exp. of
500s each
900s
PSF size (arcsec) 1.1 1.1 1.3




0.6
0.8
Pixel scale (mas/pixel)

188 188 188
188 144 188
188
Date observed 1998/05/31 1998/05/31 1999/06/25 1999/06/25
1999/07/02
1999/06/25
1999/07/02
2000/03/28 1999/06/23 2000/03/29 1999/06/23 2000/03/28 1999/06/25
Reference no. [1] [1] [2] [2] [2] [4] [2] [3] [2] [4] [2]

Redshifts

Object Redshift Instrument Date Observed Reference
Lens galaxy 0.4386±0.0008 LRIS (Keck II) 1998/04/21 [1]
Source 1.0189±0.0004 LRIS (Keck II) 1998/04/21 [1]

Lens Models

Click on the model's reference number to go to the relevant paper's abstract on ADS.


[4]
Rusin et al. utilise the extra constraints available from VLBA observations to model this system with a singular power-law ellipsoid (SPLE) mass distribution, that predicts a 35.9+-2.0 h-1 time delay between the images. Inclusion of a second mass distribution at the position of X reduces the time delay by 15-25%. Both models have NDF=0. The power law exponent for the surface mass distribution (Σ(r) α r) is limited to 0.95 ≤ β ≤ 1.21 (2σ) when X is not included in the model.

Notes

  1. Component C probably unrelated to lens.

  2. Toft, Hjorth and Burud detected A, B and the lens galaxy in z', but lacked standard photometry in this band.

  3. Rusin et al. detect a faint extended object West of the lensing galaxy in HST imaging. In addition, they note a diffuse arc West of image B.

  4. Rusin et al. suggest that substructure may be responsible for the apparent bending of the jet in image B compared to image A, and recommend deeper imaging at higher resolution.

References

Click here to see the CASTLES data available for this object, or here to search for references on NED. You can go to a paper's abstract on ADS by clicking its reference number.


[1] CLASS B1152+199 and B1359+154: Two New Gravitational Lens Systems Discovered in the Cosmic Lens All-Sky Survey, S. T. Myers et al., Astron. J. 117, Issue 6, pp. 2565-2572 (1999)


[2] The extinction curve of the lensing galaxy of B1152+199 at z = 0.44, S. Toft, J. Hjorth and I. Burud, Astron. & Astrophys. 357, pp. 115-119 (2000)


[3] Subarcsecond Optical Images of the Radio Gravitational Lens B1152+199, J. A. Muñoz et al., Astrophys. J. 563, pp. L107-L109 (2001)


[4] High-resolution observations and mass modelling of the CLASS gravitational lens B1152+199, D. Rusin et al., Mon. Not. R. Astron. Soc. 330, pp. 205-211 (2002)


[5] A submillimeter survey of gravitationally lensed quasars, R. Barvainis and R. Ivison, Astrophys. J. 571, pp. 712-720 (2002)

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