Imaging with EMIR

The filter wheel has 16 positions, 14 for filters, a clear aperture and a closed position (the disc itself blocks the light in a position where no aperture is machined). The FOV in this mode is 6,7x6.7 arcmin.

EMIR band filters cover a spectral range of 1.6 microns, from 0.9 to 2.5, with three set of filters, broad and narrow band, plus some order sorting elements. The following table provides the measured parameters at the IAC optical laboratory at room temperature at the centre of the filter and with normal incidence (Broad Band: Bb; Narrow Band: Nb and Order Sorting: Os).

 

 

 

FILTER

Central λ
[nm]

FWHM
[nm]

Transmitance

Plot

Transmitance

Data

Type

Y

1031,5

133

 yes  yes

Bb

J

1253,25

159,5

 yes  yes

Bb

H

1629

281

 yes yes

Bb

K-short

2160

312

 yes  yes

Bb

K

2234

322

 yes yes

Bb

K spect

2214,25

426,5

 yes  yes

Bb

Fell

1646,75

29,5

 yes  yes

Nb

Cont. Fell

1714,35

26,7

 yes yes

Nb

Brackett-gamma

2175,5

35

 yes  yes

Nb

Cont. Br-gamma

2126,5

30

 yes  yes

Nb

H2 (1-0)

2125,25

30.5

 yes  yes

Nb

H2(2-1)

2249

29

 yes  yes

Nb

YJ

1114,75

431,5

 yes  yes

Os

HK

1929,25

951,5

 yes  yes

Os