It has been recently proposed that massive fast-rotating highly-magnetized white dwarfs could describe the observational properties of some of Soft Gamma-Ray Repeaters ( SGRs ) and Anomalous X-Ray Pulsars ( AXPs ) .
Moreover , it has also been shown that high-field magnetic ( HFMWDs ) can be the outcome of white dwarf binary mergers .
The products of these mergers consist of a hot central white dwarf surrounded by a rapidly rotating disk .
Here we show that the merger of a double degenerate system can explain the characteristics of the peculiar AXP 4U 0142+61 .
This scenario accounts for the observed infrared excess .
We also show that the observed properties of 4U 0142+6 are consistent with an approximately 1.2 ~ { } M _ { \sun } white dwarf , remnant of the coalescence of an original system made of two white dwarfs of masses 0.6 M _ { \sun } and 1.0 M _ { \sun } .
Finally , we infer a post-merging age \tau _ { WD } \approx 64 kyr , and a magnetic field B \approx 2 \times 10 ^ { 8 } G. Evidence for such a magnetic field may come from the possible detection of the electron cyclotron absorption feature observed between the B and V bands at \approx 10 ^ { 15 } Hz in the spectrum of 4U 0142+61 .