Montage And The Spitzer Deep, Wide-Field Survey (SDWFS)

Montage has been used by a number of projects to create image mosaics for distribution as science products. One such project is the the Spitzer Deep, Wide-Field Survey (SDWFS), which you can read about in the paper by Ashby et al. It is a four-epoch infrared survey of ten square degrees in the Bootes field of the NOAO Deep Wide-Field Survey made with the Infrared Array Camera (IRAC) aboard the  Spitzer Space Telescope. Its science value lies in the face that  the four epochs allow  selection of infrared-variable and high proper motion objects over a wide field on timescales of years,and it is senstive out to z~3 with relatively little impact from cosmic variance.

False-color IRAC image of the full SDWFS field using the full, four-epoch dataset (RGB = 8.0, 4.5, 3.6 μm). The full Moon is shown to indicate the angular scale. Three interesting targets identified from their IRAC properties are indicated. From Ashby et al.

False-color IRAC image of the full SDWFS field using the full, four-epoch dataset (RGB = 8.0, 4.5, 3.6 μm). The full Moon is shown to indicate the angular scale. Three interesting targets identified from their IRAC properties are indicated. From Ashby et al.

The project used Montage co-add individual tiles into full-field images, one for
each band and each epoch. The authors note that they used the coverage maps that accompany the mosaics to eliminate the impact of cosmic rays on the final mosaics. The mosaics are available as science products from the NASA/IPAC Infrared Science Archive (IRSA).

SDWFS IRAC 3.6 μm coadd (four coadded epochs) of the Bootes field, computed with Montage. From Ashby et al.

SDWFS IRAC 3.6 μm coadd (four coadded epochs) of the Bootes field, computed with Montage

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