• Filters for NIR astronomical photometry: comparison of commercial IRWG filters and designs using OpenFilters

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    • Keywords


      NIR photometry; filter design; Opensource software.

    • Abstract


      The photometric accuracy in the near-infrared (NIR) wavelength range (0.9–2.6 $\mu$m) is strongly affected by the variability of atmospheric transmission. The Infrared Working Group (IRWG) has recommendedfilters that help alleviate this issue and provide a common standard of NIR filtersets across different observatories. However, accurate implementation of these filters are yet to be available to astronomers. In the meantime, InGaAs based detectors have emerged as a viable option for small and medium telescopes. The present work explores the combination of IRWG filtersets with InGaAs detectors. A few commercially available filtersets that approximate the IRWG profile are compared. Design of more accurate IRWG filtersets suitable for the InGaAs sensitivity range is undertaken using an open-source filter design software – OpenFilters. Along with the photometric filters iZ, iJ and iH, design of a few useful narrow band filters is also presented. These filters present opportunities for small and medium telescopes for dedicated long-termobservation of interesting infrared sources.

    • Author Affiliations



      1. Indian Institute of Astrophysics, Bangalore 560034, India.
    • Dates

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