Variable Seeing Images for the D1

Summary:
Images taken under different seeing conditions in the CFHTLS D1 field have been stacked to roughly the depth of the CFHTLS Wide Fields. These images can be used to test the effects of image quality on various measurements. Also provided is a "best half" seeing image of the D1.
Variable seeing animation
The animation above alternately shows a stack made from 0.5 arcsec seeing images and a 1.1 arcsec stack. (Reload the page if it stop blinking)


Reduction procedure
The stacks were generated in exactly the same way as described here. The only difference was that only a few exposures (~10) go into each image stack rather than all the available images. The images for each stacked were selected based on the image quality value given by CADC. There are 7 stacks. The best seeing stacks was made from images with seeing 0.5here.


Images The images are password protected. They are primarily for use by my collaborators. Other members of the CFHTLS community are welcome to use them as well. However, publications based on these data should include me on the author list. Also, the CADC should be acknowledged in the usual way:

Guest User, Canadian Astronomy Data Centre, which is operated by the Dominion Astrophysical Observatory for the National Research Council of Canada's Herzberg Institute of Astrophysics.

The images and the weight maps are available as multi-extension FITS images and as individual images.

Multi-extension images: The naming convention for the multi-extension images is:
 D1.I.0.60-0.70.fits
 ^  ^ ^        
 |  | |        
 |  | |______________ seeing range (0.6 < IQ < 0.7 in this case)
 |  |________________ filter
 |___________________ field
The naming convention is slightly different for the "best half" seeing images. To examine the multi-extension FITS images, split them using the CFITSIO version of imcopy.
Individual images The naming convention for the individual images is:
 D1.I.0.60-0.70.26.fits
 ^  ^ ^         ^
 |  | |         |____ CCD 
 |  | |______________ seeing range (0.6 < IQ < 0.7 in this case)
 |  |________________ filter
 |___________________ field
and is similar for the weight images. The naming convention is slightly different for the "best half" seeing images. The indvidual images are arranged below by seeing band and by chip in the same configuration as the layout of MegaCam.
  • Seeing 0.50
CCD number
Data Images
Weight Images
00
00
01
01
02
02
03
03
04
04
05
05
06
06
07
07
08
08
Data Images
Weight Images
09
09
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
Data Images
Weight Images
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
Data Images
Weight Images
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35


  • Seeing 0.60 CCD number Data Images
    Weight Images00
    00 01
    01 02
    02 03
    03 04
    04 05
    05 06
    06 07
    07 08
    08 Data Images
    Weight Images09
    09 10
    10 11
    11 12
    12 13
    13 14
    14 15
    15 16
    16 17
    17 Data Images
    Weight Images18
    18 19
    19 20
    20 21
    21 22
    22 23
    23 24
    24 25
    25 26
    26 Data Images
    Weight Images27
    27 28
    28 29
    29 30
    30 31
    31 32
    32 33
    33 34
    34 35
    35

  • Seeing 0.70 CCD number Data Images
    Weight Images00
    00 01
    01 02
    02 03
    03 04
    04 05
    05 06
    06 07
    07 08
    08 Data Images
    Weight Images09
    09 10
    10 11
    11 12
    12 13
    13 14
    14 15
    15 16
    16 17
    17 Data Images
    Weight Images18
    18 19
    19 20
    20 21
    21 22
    22 23
    23 24
    24 25
    25 26
    26 Data Images
    Weight Images27
    27 28
    28 29
    29 30
    30 31
    31 32
    32 33
    33 34
    34 35
    35

  • Seeing 0.80 CCD number Data Images
    Weight Images00
    00 01
    01 02
    02 03
    03 04
    04 05
    05 06
    06 07
    07 08
    08 Data Images
    Weight Images09
    09 10
    10 11
    11 12
    12 13
    13 14
    14 15
    15 16
    16 17
    17 Data Images
    Weight Images18
    18 19
    19 20
    20 21
    21 22
    22 23
    23 24
    24 25
    25 26
    26 Data Images
    Weight Images27
    27 28
    28 29
    29 30
    30 31
    31 32
    32 33
    33 34
    34 35
    35

  • Seeing 0.90 CCD number Data Images
    Weight Images00
    00 01
    01 02
    02 03
    03 04
    04 05
    05 06
    06 07
    07 08
    08 Data Images
    Weight Images09
    09 10
    10 11
    11 12
    12 13
    13 14
    14 15
    15 16
    16 17
    17 Data Images
    Weight Images18
    18 19
    19 20
    20 21
    21 22
    22 23
    23 24
    24 25
    25 26
    26 Data Images
    Weight Images27
    27 28
    28 29
    29 30
    30 31
    31 32
    32 33
    33 34
    34 35
    35

  • Seeing 1.00 CCD number Data Images
    Weight Images00
    00 01
    01 02
    02 03
    03 04
    04 05
    05 06
    06 07
    07 08
    08 Data Images
    Weight Images09
    09 10
    10 11
    11 12
    12 13
    13 14
    14 15
    15 16
    16 17
    17 Data Images
    Weight Images18
    18 19
    19 20
    20 21
    21 22
    22 23
    23 24
    24 25
    25 26
    26 Data Images
    Weight Images27
    27 28
    28 29
    29 30
    30 31
    31 32
    32 33
    33 34
    34 35
    35

  • Seeing 1.10 CCD number Data Images
    Weight Images00
    00 01
    01 02
    02 03
    03 04
    04 05
    05 06
    06 07
    07 08
    08 Data Images
    Weight Images09
    09 10
    10 11
    11 12
    12 13
    13 14
    14 15
    15 16
    16 17
    17 Data Images
    Weight Images18
    18 19
    19 20
    20 21
    21 22
    22 23
    23 24
    24 25
    25 26
    26 Data Images
    Weight Images27
    27 28
    28 29
    29 30
    30 31
    31 32
    32 33
    33 34
    34 35
    35

  • Seeing IQ<0.75 (best half seeing image)
    CCD number
    Data Images
    Weight Images
    00
    00
    01
    01
    02
    02
    03
    03
    04
    04
    05
    05
    06
    06
    07
    07
    08
    08
    Data Images
    Weight Images
    09
    09
    10
    10
    11
    11
    12
    12
    13
    13
    14
    14
    15
    15
    16
    16
    17
    17
    Data Images
    Weight Images
    18
    18
    19
    19
    20
    20
    21
    21
    22
    22
    23
    23
    24
    24
    25
    25
    26
    26
    Data Images
    Weight Images
    27
    27
    28
    28
    29
    29
    30
    30
    31
    31
    32
    32
    33
    33
    34
    34
    35
    35




  • Back to Stephen Gwyn's CFHTLS pages
    Send comments/suggestions/problems to

    gwyn@uvastro.phys.uvic.ca