Precision Photometry for Q0957+561 Images A and B

@article{Colley1999PrecisionPF,
  title={Precision Photometry for Q0957+561 Images A and B},
  author={W. Colley and R. Schild},
  journal={The Astrophysical Journal},
  year={1999},
  volume={518},
  pages={153-166}
}
  • W. Colley, R. Schild
  • Published 1999
  • Physics
  • The Astrophysical Journal
  • Since the persuasive determination of the time delay in Q0957+561, much interest has centered around shifting and subtracting the A and B light curves to look for residuals due to microlensing. Solar mass objects in the lens galaxy produce variations on timescales of decades, with amplitudes of a few tenths of a magnitude, but MACHOs (with masses of order 10-3-10-7 M☉) produce variations at only the 5% level. To detect such small variations, highly precise photometry is required. To that end… CONTINUE READING
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