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The Archival Pure Parallel Project

Project Web Site

Image Data Download:
LMC (Large Magellanic Cloud)
SMC (Small Magellanic Cloud)
NBG (Nearby galaxies)
FFD (Four Filter Data)
TFD (Three Filter Data)
SFD (Single Filter Data)
FND (Near FIRST/NVSS Radio Source Data)

The Archival Pure Parallel Project processed and combined with state-of-the-art tools about 2,000 WFPC2 images, primarily in the wide UBVI filters, obtained in parallel with other HST instruments. We produced combined, drizzled, cosmic-ray cleaned images for each pointing. These data can be used to address a wide range of science topics: measuring the cosmic shear on scales from 20" to 2'; discovering ~ 50 starforming galaxies at z ~ 4; finding optical counterparts to AGNs in wide-area radio and X-ray catalogs; improving the determination of the scale length of the Galactic disk; and studying stellar populations down to 1 solar mass for about 25 separate lines of sight in the Magellanic Clouds. The images are being made available to the astronomical community for a wide variety of other investigations, thus helping realize the legacy of WFPC2 parallel images.

The details of the processing pipeline are described in a paper published in the PASP 118:450.

The data may be downloaded through your browser using the web pages linked from the left. Images may also be searched for, and downloaded, through the HLSP search page. You may also download the data via anonymous ftp by ftping to and then cd /pub/hlsp/appp . The data are stored in subdirectories by "pointing name" under the subdirectories lmc, smc, nbg, ffd, tfd, sfd, and fnd.