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Currently Available Mosaic Filters



The following filters are now available in the full 5.75 inch size required for the Mosaic CCD imagers. If you would like to bring your own filters, the physical size should be 146 x 146 mm, and the filter should be 12 mm thick. Properties for the CTIO interference filters shown below are at the f/2.9 of the CTIO 4-m prime focus. Properties shown below for the 4meter filters are for parallel light. Note that most KPNO Mosaic filters (except for the U filter) are parfocal while at CTIO the filters are NOT parfocal - approximate focus offsets can be found on the CTIO Mosaic filters page.

As of April 24, 2012 all CTIO Mosaic-2 filters have been transferred to KPNO and are available for use with Mosaic-1.

IMPORTANT: All filters must be referred to by specific names (listed here) when using the instrument control software at the telescope.

For more information on a filter (e.g. to view transmission curves), click on the filter name. All KPNO Mosaic filters were measured at NOAO.

 
KPNO Mosaic Filters
     
CTIO Mosaic Filters
 
Filter
Central Wave, Å FWHM, Å Peak Trans  
Filter
Central Wave, Å FWHM, Å Peak Trans
U k1001 3552 630.71 76.39%   U c6001 3570 650 72.47%
B Harris k1002 4381 993.88 69.62%   B Harris c6002 4360 990 62.8%
V Harris k1003 5386.76 948.66 88.62%   V Harris c6026 5370 940 87.61%
R Harris k1004 6513.54 1511.3 86.86%   R Harris c6004 6440 1510 81.98%
I Nearly-Mould k1005 8204.53 1914.59 94.82%   I c6028 8050 1500 95.74%
C Washington k1006 3860 1034 75.4%   C Washington c6029 3850 1075 83%
M Washington k1007 5100 1140 87.1%   M Washington c6007 5020 1020 90.75%
D51 DDO 51 k1008 5145.2 162.9 87.56%   D51 DDO 51 c6008 5130 154 84.76%
ha H-alpha k1009 6574.74 80.62 94.31%   ha H-alpha c6009 6563 80 75.87%
ha4 H-alpha+4nm k1010 6620.52 80.48 91.81%   ha8 H-alpha+8nm c6011 6650 80 86.24%
ha8 H-alpha+8nm k1011 6654.19 81.33 90.58%   o2 OII c6012 3727 50 61.12%
ha12 H-alpha+12nm k1012 6698.53 82.95 86.43%   s2 SII c6013 6725 80 74.03%
ha16 H-alpha+16nm k1013 6730.72 81.1 91.12%   o3 OIII c6014 4990 50 74.09%
O3 OIII N2 k1014  * 5024.9 55.55 76.48%   wh Bk-7 c6016 6500 5000  
Ooff OIII+30nm k1015 5317.54 242.69 92.79%   g SDSS c6017 4813 1537 89.34%
wh Bk-7 k1016 5600 6800 97.2%   r SDSS c6018 6287 1468 93.82%
g SDSS k1017 4750.58 1395.73 91.16%   i SDSS c6019 7732 1548 93.55%
r SDSS k1018 6292.28 1475.17 92.83%   z SDSS c6020 9400 2000 99.94%
i SDSS k1019 7726.28 1539.89 95.17%   u SDSS c6022 3600 400 65.49%
z SDSS k1020 *** Retired! 9400 2000 94.8%   Bj Tyson c6024 4350 1650 85.1%
wrc3 WR CIII k1021 4666.15 51.71 71.5%   It Tyson I c6025 8800 2000 99.61%
wr475 WR 475 k1022 4764 51.27 82.19%   VR Stubbs c6027 *** Retired! 6100 2000 89.6%
wrhe2 WR HeII k1023 4702.6 50.31 80.72%          
wrc4 WR CIV k1024 5828.71 41.79 74.8%          
Bw NDWFS k1025 4110.78 1275.21 93.88%          
815 815_v1 k1026 8152.10 70.36 96.21%          
823 823_v1 k1027 8232.04 70.61 96.11%          
918R 918R_v1 k1028 9210.96 81.22 90.06%          
VR k1039 *** New! 5940 2216 99.46%          
VR Bernstein k1040 *** Retired! 5944.95 2119.56 95.40%          
Un Steidel k1041 3479.17 562.72 81.47%          
Gn Steidel k1042 4819.66 762.13 89.38%          
Rs Steidel k1043 6975.13 1048.78 90.11%          
Us solid U k1044 3651.81 588.20 81.15%          
Ud Dey custom U k1045 3485.23 329.76 73.16%          
815 815_v2 k1046 8152.64 68.53 84.52%          
823 823_v2 k1047 8238.79 68.02 92.74%          
337 BATC k1051 **     54.97%          
390 BATC k1052 **     58.40%          
420 BATC k1053 **     64.03%          
454 BATC k1054 **     81.80%          
493 BATC k1055 **     87.41%          
527 BATC k1056 **     84.57%          
579 BATC k1057 **     88.91%          
607 BATC k1058 **     87.31%          
666 BATC k1059 **     87.14%          
705 BATC k1060 **     83.80%          
755 BATC k1061 **     78.25%          
802 BATC k1062 **     85.86%          
848 BATC k1063 **     88.35%          
918 BATC k1064 **     80.00%          
973 BATC k1065 **     84.08%          


Below are plots of some of our filter sets. Click on the plot to view full size.

Harris Filters
H-alpha Filters
SDSS and Washington
Filters
OIII and DDO51 Filters
Wolf-Rayet Filters
Rhoads Filters
Windhorst BATC Filters


Notes

* The [OIII] filter is not a good match for the 0.9-m -- a replacement has been proven difficult to construct. For now, there are no alternatives.

** Rogier Windhorst and collaborators at Arizona State University are making available to users of MOSAIC-1 at the Mayall 4m telescope and NOAO time on the WIYN 0.9m telescope 15 medium band filters designed to avoid the brightest and most variable night sky lines. The September 2001 issue of the NOAO newsletter (see page 34) contains an article describing the filters along with references describing their past use by Windhorst and collaborators. A figure showing the throughput curves for the filters is available via the link below. The entire ASU/Windhorst filter set includes 15 filters covering from 3370 angstroms to 9730 angstroms. The filters "Windhorst XXXXXXX a" through "Windhorst XXXXX p" in the above list of Mosaic filters (by serial number these are k1051 through k1065 in the list) can be requested for use.

The BATC filter set belongs to Dr. Rogier Windhorst of Arizona State University. Observers wishing to use these filters should request permission to use these filters from Dr. Windhorst (Rogier.Windhorst@asu.edu) prior to submitting their proposals to the NOAO TAC. Dr. Windhorst will inform NOAO when he has given approval for use of the filter. Please make clear in your request to Dr. Windhorst the following information: Proposed Telescope/Instrument; PI of intended proposal; General Science goals of the proposal.

Rogier Windhorst has provided the following figure showing the transmission of the ASU/Windhorst filter set, Click Here. Note that the filters are labeled a through k, m through p, these short "letter" names will allow you to match the filters to the wavelength name. For example, "a" corresponds to filter "337 BATC", etc..

*** The KPNO VR Berstein and KPNO SDSS z' filters were damaged in June 2011. The CTIO VR filter (c6027) is also damaged. The new KPNO VR filter (k1039) is now available as a replacement. The CTIO SDSS z' equivalent (c6020) can be requested as replacement for the KPNO z' filter.

Filters Expected Soon!


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NOAO is operated by the Association of Universities for Research in Astronomy (AURA), Inc. under cooperative agreement with the National Science Foundation.

by Heidi Schweiker

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NOAO >   KPNO >   Telescopes and Instruments >   Mosaic

heidis@noao.edu

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