FLAMINGOS --- Filter Information


Please note that several filters were changed during the summer of 2003.
Take care to select the correct transmission curve data from the tables below.

Broadband Filters for FLAMINGOS
Purchased by UF from BARR Associates
These replaced loaner filters from NOAO & Gemini

J-band
(see comments below)
H-band
Ks-band
K-band
Filter ID
MAN-240A
MAN-240B
MAN-109A
MAN-109B
MAN-306A
MAN-311A
Did UF buy a filter from BARR?

Cannot find any record of it, and we never received one.
Filter Location
Shipping Case #4
Dewar
Dewar
Shipping Case #4
Dewar
Shipping Case #4
Dates Installed

July 2003 to present
July 2003 to present

July 2003 to present

Filter Curve, 300 K
55 KB (Data)
66 KB (Data)
67 KB (Data)
68 KB (Data)

55 KB (Data)
60 KB (Data)

Witness Sample Curve, ~300 K n.a.
99 KB (Data)
61 KB (Data)
97 KB (Data)

Witness Sample Curve, 77 K
50 KB (Data)
99 KB (Data)
60 KB (Data)
97 KB (Data)









Comments
  • These filters were either obtained through the 'Filter Consortium' or designed to meet their specifications.

  • The J-band and H-band filters very closely match the CIT/CTIO photometric system (cf. Elias, J. H., Frogel, J. A., Matthews, K., & Neugebauer, G. 1982, AJ, 87, 1029; the bandpasses of their cold filters are J = 1.13 to 1.37 micron, H = 1.50 to 1.80 micron, K = 2.01 to 2.42 micron).  I remember Richard once told Pimol to make this assumption.

  • Filters are 67 mm in diameter, 5 mm thick, unwedged.
  • Transmission measured at normal incidence.
  • Transmission of finished filters measured with filters at ambient temperature (300 K); there may be slight differences when cooled to 77 K.
  • Witness samples have transmission measurements both at 300 K and 77 K.
  • Mark Dickinson and our two survey teams have seen bright ring-shaped features in the J, H, and Ks band data with these filters; we did not see these features with the thinner loaner filters.  Our two survey teams have not reported to me any difficulties making these features go away when processing data taken with our standard dither scripts.

.
Standard Broad Band Filters for FLAMINGOS
Filters Loaned to UF by NOAO and Gemini

J-band
H-band
K-band Ks-band
Where From, Vendor
NOAO - OCLI
NOAO - OCLI
NOAO - OCLI
Gemini - BARR(?)
Dates Installed
2000 to July 2003
2000 to July 2003
2000 to present
2000 to July 2003
Filter Curve Data - Warm
0.517 KB
0.791 KB
0.509 KB
34 KB (Data)
11 KB (gif)
Filter ID, if known
n.a.
n.a.
n.a.
NIRI Ks G0205





Comments
  • See the comments in the above table about photometric systems, as pertaining to the J-band and H-band filters.  The K-band filter is a little short on the red side (2.35 vs. 2.42 micron), as compared to the CIT/CTIO system.

  • These filters are 60 mm in diameter, 3 mm thick, and unwedged.

.
Special Wideband Spectroscopy Filters for FLAMINGOS
Purchased by UF from JANOS Technologies


JH-band
HK-band
Janos P/N
903086-07
903086-02
Filter Location
Dewar
Dewar
Date Installed
2000
2000
Spares
Qty = 3, at UF
Qty = 2, at UF
Notes
n.a.
Backed by 3 mm thick piece of PK50
Diameter
67 mm
67 mm
Center Thickness
4.2 mm
10 mm

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Last updated 2004 August 18, Wednesday
S. Nicholas Raines