Infrared constraints on the dark mass concentration observed in the cluster Abell 1942
Corresponding Author
Meghan E. Gray
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
[email protected]Search for more papers by this authorRichard S. Ellis
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorJames R. Lewis
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorRichard G. McMahon
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorAndrew E. Firth
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorCorresponding Author
Meghan E. Gray
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
[email protected]Search for more papers by this authorRichard S. Ellis
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorJames R. Lewis
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorRichard G. McMahon
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorAndrew E. Firth
1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2 Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorAbstract
We present a deep H-band image of the region in the vicinity of the cluster Abell 1942 containing the puzzling dark matter concentration detected in an optical weak lensing study by Erben et al. We demonstrate that our limiting magnitude, H=22, would be sufficient to detect clusters of appropriate mass out to redshifts comparable with the mean redshift of the background sources. Despite this, our infrared image reveals no obvious overdensity of sources at the location of the lensing mass peak, nor an excess of sources in the I−H versus H colour–magnitude diagram. We use this to constrain further the luminosity and mass-to-light ratio of the putative dark clump as a function of its redshift. We find that for spatially flat cosmologies, background lensing clusters with reasonable mass-to-light ratios lying in the redshift range 0<z<1 are strongly excluded, leaving open the possibility that the mass concentration is a new type of truly dark object.
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