Hubble Space Telescope multi-color ACS mosaic of M51:
downloadable FITS data and associated preview images

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The table below lists the FITS files grouped by filter/bandwidth. Drizzled science data (*_drz_sci.fits) with corresponding weight maps (*_weight.fits), in FITS format. These have a scale of 0.05 arcsec per pixel, and have dimensions of 8600 x 12200 pixels (~420 MB each). Low-resolution (1/4) block-averaged FITS versions of each mosaic and weight map were also produced using the IRAF blkavg task, mainly for "quick-look" downloading and viewing, and/or for educational purposes (not intended for scientific analysis). These have a scale of 0.20 arcsec per pixel, and dimensions of 2150 x 3050 pixels (~26 MB each, or 1/16 the size of the full-resolution mosaics).

Image filename Click on filename to download data	Filter	Exposure Time	Limiting mag*	Black & White preview	Weight preview
h_m51_b_s05_drz_sci.fits h_m51_b_s05_drz_weight.fits h_m51_b_s20_drz_sci.fits h_m51_b_s20_drz_weight.fits	F435W (B)	2720s	27.3 mB
h_m51_v_s05_drz_sci.fits h_m51_v_s05_drz_weight.fits h_m51_v_s20_drz_sci.fits h_m51_v_s20_drz_weight.fits	F555W (V)	1360s	26.5 mV
h_m51_i_s05_drz_sci.fits h_m51_i_s05_drz_weight.fits h_m51_i_s20_drz_sci.fits h_m51_i_s20_drz_weight.fits	F814W (I)	1360s	25.8 mI
h_m51_h_s05_drz_sci.fits h_m51_h_s05_drz_weight.fits h_m51_h_s20_drz_sci.fits h_m51_h_s20_drz_weight.fits	F658N (H-alpha)	1360s	NA

^* for point source at S/N = 5 Johnson filters