Description of Mosaics in the Cygnus-X Legacy Survey Data Release 1.0

                                                              2011-05-03  
                                                          Joseph L. Hora

The data for this program were obtained as part of the 
Cygnus-X Legacy Survey (PID 40184) 
(see "The Spitzer Legacy Survey of the Cygnus-X Region", Hora, J. L., 
R. A. Gutermuth, S. Carey, D. Mizuno, K. E. Kraemer, X. P. Koenig,   
S. Bontemps, S. T. Megeath, N. Schneider, F. Motte, E. Keto, H. A.    
Smith, L. E. Allen, R. Simon, S. Price, J. D. Adams, G. G. Fazio 2010,
in Reionization to Exoplanets, ASPCS, in press                        
http://www.cfa.harvard.edu/cygnusX/hora_j.pdf )   


The following mosaics of the Cygnus-X Survey data are included in Release 1.0:

Mosaics at a resolution of 2.4 arcsec/pixel:
------------------------------------------------
IRAC Channel 1 (3.6 um): I1_cygnus_2.4.fits
IRAC Channel 2 (4.5 um): I2_cygnus_2.4.fits
IRAC Channel 3 (5.8 um): I3_cygnus_2.4.fits
IRAC Channel 4 (8.0 um): I4_cygnus_2.4.fits
MIPS Channel 1  (24 um): M1_cygnus_2.4.fits


MIPS mosaics at a resolution of 1.2 arcsec/pixel:
--------------------------------------------------
MIPS Channel 1  (24 um): M1_cygnus_1.2.fits

Mosaics at a resolution of 0.8626716 arcsec/pixel:
----------------------------------------------------
IRAC Channel 1 (3.6 um): I1_cygnus_0.8.fits
IRAC Channel 2 (4.5 um): I2_cygnus_0.8.fits
IRAC Channel 3 (5.8 um): I3_cygnus_0.8.fits
IRAC Channel 4 (8.0 um): I4_cygnus_0.8.fits


Matching Tiles of mosaics at 0.8626716 arcsec/pixel (IRAC) or 1.2 arcsec/pixel (MIPS 24)
---------------------------------------------------------------------------------------

Because the higher resolution images are rather large, the images have been divided into smaller
overlapping tiles with the same RA and Decl. centers to make it easier for the user to display if 
one has insufficient memory to work with the larger images.

The IRAC mosaics have the file name of the form
 
Ix_cygnus_0.8_m_n.fits

where x is the channel number, and m and n are the row and column index of the image tile.
All 0.8 images are subimages of the full Ix_cygnus_1.2.fits images listed above.

The MIPS mosaic tiles are subimages of the M1_cygnus_1.2.fits image above, and have the form

M1_cygnus_1.2_m_n.fits

where m and n are the row and column index values.  The R.A. and Decl. positions for each of the
tiles is given below.  Tiles with no valid pixels in the image are not included (e.g., tile 0_0 in 
all bands).  An image of the tile layouts is included (cygnus_tiles.jpg).

Tile   RA        Decl.  (J2000.0)

1_0 309.117164 37.098746 
2_0 307.239876 37.101560 
3_0 305.364218 37.074810 
0_1 311.056554 38.560601 
1_1 309.141444 38.594821 
2_1 307.223354 38.597798 
3_1 305.307003 38.569500 
4_1 303.396660 38.510136 
0_2 311.124359 40.057687 
1_2 309.166808 40.093820 
2_2 307.206093 40.096964 
3_2 305.247236 40.067083 
4_2 303.294795 40.004404 
0_3 311.195238 41.555278 
1_3 309.193325 41.593360 
2_3 307.188048 41.596674 
3_3 305.184759 41.565181 
4_3 303.188331 41.499124 
0_4 311.269404 43.051323 
1_4 309.221074 43.091390 
2_4 307.169164 43.094877 
3_4 305.119382 43.061742 
4_4 303.076950 42.992247