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CLASS B0850+054, a double image gravitational lens



Lens System Summary

B0850+054 is a two-image system with a separation of ~0.68 arcsec. VLBA observations at 5GHz show that the stronger (A) image is tangentially stretched over ~20 mas and has at least 5 sub-components. The weaker image is radially stretched but the resolution is not high enough to show the individual sub-components. UKIRT observations in K band show both the lens and the strongest lensed image.

This Lens System

Lens name B0850+054
Survey CLASS
Images 2
B1950.0 coords 08h50m15.249s 05°26'37.800"
J2000.0 coords 08h52m53.575s 05°15'15.670"

Lens System Structure and Labelling

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

Image/Lens Positions

Image/Lens Relative Position
East (mas) North (mas)
A +0.0 +0.0
B +164 -660

Image/Lens Separations

Separation (mas)
Component A B
A
680.1
B 680.1
Position angle (°)
Component A B
A
-14.0
B 166.0

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.

Discovery image Click to see a larger version
VLA discovery map (8.4GHz)
UKIRT images
(crosses show radio positions;
IR-radio registration using astrometry
from a Carlsberg star) 		Click here to see a larger version
UKIRT K-band image
A.D. Biggs
WSRT map Click to see a larger version
327MHz WSRT image
MERLIN maps Click to see a larger version
MERLIN 5GHz map
VLBA maps Click to see a larger version
VLBA 5GHz long-track map of image A
A.D. Biggs 		Click to see a larger version
VLBA 5GHz long-track map of image B
A.D. Biggs

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