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.

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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.

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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