Characterization of Narrow Band Filters for Infrared Astronomy. The Brgamma and H2 filters


L. Vanzi (1), S. Gennari (2), M. Ciofini (3), L. Testi (1)

(1) Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi, 5, I-50125 Firenze, Italy

(2) Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, I-50125 Firenze, Italy

(3) Istituto Istituto Nazionale di Ottica, Largo E. Fermi, 5, I-50125 Firenze, Italy


We present a characterization of two narrow band filters commonly used in Infrared Astronomy. Our study mainly quantifies the effect of temperature and tilt angle on the central wavelength and width of the transmission bands of such filters. This allows to evaluate some important effects that must be taken into account to have good quality astronomical images. Effects as the limitation of the field of view and the presence of OH sky lines in the final image are quantified.

Mantained by: Leonardo Testi