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CLASS B1600+434, a double image gravitational lens



Lens System Summary

B1600+434 was discovered in CLASS and is a double image lens. An optical time delay of 51±4 days has been measured by Burud et al. [6], and a radio delay of 47±6 days by Koopmans et al. [7]. Microlensing is present in both optical (Burud et al. [6]) and radio C and X bands (Koopmans et al., [8]). The lensing galaxies both have redshifts of 0.4144, and the source has a redshift of 1.589. The lensing galaxy is an edge-on spiral. A decline in the 5GHz flux density has caused this source to drop out of the CLASS statistically complete sample.

This Lens System

Lens name B1600+434
Survey CLASS
Images 2
B1950.0 coords 16h00m01.402s 43°25'05.500"
J2000.0 coords 16h01m40.446s 43°16'47.760"

Lens System Structure and Labelling

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

Components labelled as in Jackson et al. (1995)

Image/Lens Positions

Image/Lens Relative Position
East (mas) North (mas)
A +0.0 +0.0
B +990 -1190

Image/Lens Separations

Separation (mas)
Component A B
A
1548.0
B 1548.0
Position angle (°)
Component A B
A
-39.8
B 140.2

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 (HST) images Click to see a larger version
WFPC2 V-band image
Koopmans et al.
Click to see a larger version
WFPC2 I-band image
Koopmans et al.
Click to see a larger version
NICMOS (H-band) image
Koopmans et al.
Optical and IR (ground-based) images Click to see a larger version
WHT image
N. Jackson
Click to see a larger version
NOT B-band image
Click to see a larger version
NOT R-band image
MERLIN and VLA maps Click to see a larger version
MERLIN 5GHz image
N. Jackson
Click to see a larger version
MERLIN 5GHz image
Click to see a larger version
VLA 8.4GHz image
N. Jackson
VLBA images of image A Click to see a larger version
Component A, VLBA 1.6GHz
L. V. E. Koopmans
Click to see a larger version
Component A, VLBA 5GHz
N. Jackson
VLBA images of image B Click to see a larger version
Component B, VLBA 1.6GHz
N. Jackson
Click to see a larger version
Component B, VLBA 5GHz
L. V. E. Koopmans
Optical spectra Click to see a larger version
Spectrum from ISIS
N. Jackson
Click to see a larger version
All spectra from ISIS
N. Jackson
Click to see a larger version
Spectrum from LRIS
Fassnacht and Cohen

Radio Flux Densities

Component Flux density (mJy)
5 GHz 8.4 GHz 8.4 GHz 8.4 GHz 8.4 GHz 8.5 GHz
A 45.2 73 (mJy beam-1 58.1 28.5 ~21-28mJy 30.1 mJy beam-1 (peak)
B 37.3 56 (mJy beam-1 48.1 23.8 ~19-24mJy 23.4 mJy beam-1 (peak)
Flux errors





Resolution (mas)



200 (A array)
700 (B array)

Map noise level
(mJy/beam)

0.12



Instrument MERLIN VLA VLA VLA VLA VLBA
Date observed 1995/03/14 1994/04/04 1994/03 1995/08 Monitoring:
1998/02/13 to
1998/10/14
1996/11/04
Reference [4] [1] [4] [4] [7] [7]

Sub-millimetre Flux Densities

Component Flux density (mJy)
3000 μm 1300 μm 850 μm
Total 25±0.3 12.6±2.3 7.3±1.8
Estimated
cal. error


5-10%
Instrument PdBI (IRAM) PdBI (IRAM) SCUBA (JCMT)
Date observed

1999-2001
Reference [10] [10] [10]

Optical Imaging

Component Brightness (Magnitudes)
F555W (V) F814W (I) F160W (H) K
A 22.5±0.1 21.4±0.1 24.1
B 23.1±0.1 21.6±0.1 24.5
G1
20.2±0.1

G2 20.6±0.1 19.2±0.1

G3 22.5±0.1 21.0±0.1

Instrument WFPC2 (HST) WFPC2 (HST) NIC1/NICMOS (HST) WHT aux. port
Integration time 800 sec 700 sec 1 ex of 2048 sec
1 ex of 576 sec

PSF size (arcsec)


0.5-0.6
Pixel scale (mas/pixel)

43 100
Date observed 1995/11/18 1995/11/18 1997/07/21 1994/07/07
Reference no. [1] [4] [5] [1]

Redshifts

Object Redshift Instrument Date Observed Reference
Lens 0.4144 LRIS (Keck) 1996/06/18 [3]
Source 1.589 LRIS (Keck) 1996/06/18 [3]

Lens Models

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


[7]
Time delay measurement produces estimate for Hubble constant of 74+14-11 (95% statistical), +26-15 (systematic) km s-1 Mpc-1 using isothermal model.

Notes

  1. Time delay measurement obtained by Koopmans et al. ([7]) of 47+12-9 days (95%), and estimate systematic error of between -8 and +7 days.

  2. Time delay measurement obtained by Burud et al. ([6]) of 51+-4 days.

  3. Radio microlensing detected (Koopmans et al. [7] and [8]).

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] 1600+434: a new gravitational lens system, N. Jackson et al., Mon. Not. R. Astron. Soc. 274, Issue 1, pp. L25-L29. (1995)


[2] Detection of a spiral lens galaxy and optical variability in the gravitational lens system B1600+434, A. O. Jaunsen and J. Hjorth, Astron. & Astrophys. 317, p.L39-L42 (1997)


[3] Keck spectroscopy of three gravitational lens systems discovered in the JVAS and CLASS surveys, C. D. Fassnacht and J. G. Cohen, Astron. J. vol. 115, p. 377 (1998)


[4] The edge-on spiral gravitational lens B1600+434, L. V. E. Koopmans et al., Mon. Not. R. Astron. Soc. 295, p. 534 (1998)


[5] NICMOS images of JVAS/CLASS gravitational lens systems, N. Jackson et al., Mon. Not. R. Astron. Soc. 311, 389-396 (2000)


[6] An optical time-delay estimate for the double gravitational lens system B1600+434, I. Burud et al., ApJ 544, Iss. 1, pp. 117-122 (2000)


[7] A time-delay determination from VLA light curves of the CLASS gravitational lens B1600+434, L.V. E. Koopmans et al., Astron & Astrophys. 356, p.391-402 (2000)


[8] Microlensing of multiply-imaged compact radio sources. Evidence for compact halo objects in the disk galaxy of B1600+434, L. V. E. Koopmans et al., Astron. & Astrophys. 358, p.793-811 (2000)


[9] Sub-milliarcsec-scale structure of the gravitational lens B1600+434, A. R. Patnaik & A. J. Kemball, Astron. & Astrophys. 353, pp. L25-L28 (2001)


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

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