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.
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This Lens System
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Lens name
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B1600+434
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Survey
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CLASS
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Images
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2
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B1950.0 coords
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16h00m01.402s
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43°25'05.500"
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J2000.0 coords
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16h01m40.446s
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43°16'47.760"
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Lens System Structure and Labelling
Image labelling for this lens (RA increases to the left, declination increases upwards)
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Image/Lens Positions
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Image/Lens
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Relative Position
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East (mas)
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North (mas)
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A
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+0.0
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+0.0
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B
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+990
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-1190
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Image/Lens Separations
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Separation (mas)
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Component
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A
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B
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A
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1548.0
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B
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1548.0
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Position angle (°)
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Component
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A
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B
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A
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-39.8
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B
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140.2
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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.
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Radio Flux Densities
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Component
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Flux density (mJy)
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5 GHz
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8.4 GHz
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8.4 GHz
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8.4 GHz
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8.4 GHz
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8.5 GHz
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A
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45.2
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73 (mJy beam-1
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58.1
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28.5
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~21-28mJy
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30.1 mJy beam-1 (peak)
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B
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37.3
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56 (mJy beam-1
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48.1
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23.8
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~19-24mJy
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23.4 mJy beam-1 (peak)
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Flux errors
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Resolution (mas)
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200 (A array)
700 (B array)
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Map noise level
(mJy/beam)
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0.12
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Instrument
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MERLIN
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VLA
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VLA
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VLA
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VLA
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VLBA
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Date observed
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1995/03/14
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1994/04/04
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1994/03
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1995/08
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Monitoring:
1998/02/13 to
1998/10/14
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1996/11/04
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Reference
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[4]
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[1]
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[4]
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[4]
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[7]
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[7]
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Sub-millimetre Flux Densities
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Component
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Flux density (mJy)
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3000 μm
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1300 μm
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850 μm
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Total
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25±0.3
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12.6±2.3
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7.3±1.8
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Estimated
cal. error
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5-10%
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Instrument
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PdBI (IRAM)
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PdBI (IRAM)
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SCUBA (JCMT)
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Date observed
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1999-2001
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Reference
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[10]
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[10]
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[10]
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Optical Imaging
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Component
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Brightness (Magnitudes)
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F555W (V)
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F814W (I)
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F160W (H)
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K
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A
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22.5±0.1
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21.4±0.1
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24.1
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B
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23.1±0.1
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21.6±0.1
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24.5
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G1
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20.2±0.1
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G2
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20.6±0.1
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19.2±0.1
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G3
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22.5±0.1
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21.0±0.1
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Instrument
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WFPC2 (HST)
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WFPC2 (HST)
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NIC1/NICMOS (HST)
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WHT aux. port
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Integration time
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800 sec
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700 sec
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1 ex of 2048 sec
1 ex of 576 sec
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PSF size (arcsec)
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0.5-0.6
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Pixel scale (mas/pixel)
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43
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100
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Date observed
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1995/11/18
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1995/11/18
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1997/07/21
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1994/07/07
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Reference no.
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[1]
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[4]
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[5]
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[1]
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Redshifts
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Object
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Redshift
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Instrument
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Date Observed
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Reference
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Lens
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0.4144
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LRIS (Keck)
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1996/06/18
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[3]
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Source
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1.589
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LRIS (Keck)
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1996/06/18
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[3]
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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.
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Notes
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.
Time delay measurement obtained by Burud et al. ([6]) of 51+-4 days.
Radio microlensing detected (Koopmans et al. [7] and [8]).
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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.
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[1] 1600+434: a new gravitational lens system, N. Jackson et al., Mon. Not. R. Astron. Soc. 274, Issue 1, pp. L25-L29. (1995)
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[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)
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[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)
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[4] The edge-on spiral gravitational lens B1600+434, L. V. E. Koopmans et al., Mon. Not. R. Astron. Soc. 295, p. 534 (1998)
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[5] NICMOS images of JVAS/CLASS gravitational lens systems, N. Jackson et al., Mon. Not. R. Astron. Soc. 311, 389-396 (2000)
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[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)
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[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)
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[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)
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[9] Sub-milliarcsec-scale structure of the gravitational lens B1600+434, A. R. Patnaik & A. J. Kemball, Astron. & Astrophys. 353, pp. L25-L28 (2001)
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[10] A submillimeter survey of gravitationally lensed quasars, R. Barvainis and R. Ivison, Astrophys. J. 571, pp. 712-720 (2002)
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