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NGC 2440

Heritage HLSP Home | README

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Following the failure of the "backup" side 2 electronics on the Advanced Camera for Surveys (ACS) on 27 January 2007, the Hubble Heritage Team was asked to conduct some new high-quality multiwavelength WFPC2 observations (proposal 11090). Although the WFPC2 has been in continuous service since being installed during Hubble Servicing Mission 1 in 1993, it has only had limited use since the installation of ACS during HST Servicing Mission 3B in 2002. The purpose of this was to quickly illustrate the current WFPC2 data quality, and produce a Heritage-quality color composite image. A secondary goal was to demonstrate the best practices for WFPC2 pointing and drizzling, and provide a concrete A-to-Z example to help guide ACS users currently converting their science programs to WFPC2. Users may find these pages useful:
Quick Start Guide to WFPC2 Imaging for ACS Proposers http://www.stsci.edu/hst/wfpc2/wfpc2_acs.html
WFPC2 dither and mosaic Pointing Patterns http://www.stsci.edu/hst/wfpc2/analysis/wfpc2_patterns.html

The Heritage Team demonstrates the improved resolution that is possible when WFPC2 observations are made with optimal sub-pixal dithering at http://heritage.stsci.edu/2007/09/supplemental.html.

Filenames follow the naming convention h_n2440_fffff_xxxx_drz_ttt.fits

  • fffff - filter
  • xxxx - orientation of the image and the contents.
    • s06y -- y-up and contains all four chips
    • s06n -- north-up and has data from chip 3 where the target was centered.
  • ttt is the type: science (sci) or weight.
image showing orientation and scale of image

Orientation/Scale
Click to see larger image with filter information.

Heritage Press Release

A representative sample of weight previews is provided.

Filenames Filter and Exposure Length Preview Weight N up Preview N weight preview
h_n2440_f439w_s06y_drz_sci.fits
h_n2440_f439w_s06y_drz_weight.fits
h_n2440_f439w_s06n_drz_sci.fits
h_n2440_f439w_s06n_drz_weight.fits
F439W
B-band
200 s
f439w y-up preview   f439w n-up preview  
h_n2440_f469n_s06y_drz_sci.fits
h_n2440_f469n_s06y_drz_weight.fits
h_n2440_f469n_s06n_drz_sci.fits
h_n2440_f469n_s06n_drz_weight.fits
F469N
He II
1600 s
f469n y-up preview f469n y-up weight preview f469n n-up preview f469 n-up weight preview
h_n2440_f502n_s06y_drz_sci.fits
h_n2440_f502n_s06y_drz_weight.fits
h_n2440_f502n_s06n_drz_sci.fits
h_n2440_f502n_s06n_drz_weight.fits
F502N
O III
1600 s
f502n y-up preview   f502n n-up preview  
h_n2440_f555w_s06y_drz_sci.fits
h_n2440_f555w_s06y_drz_weight.fits
h_n2440_f555w_s06n_drz_sci.fits
h_n2440_f555w_s06n_drz_weight.fits
F555W
V-band
120 s
f555w y-up preview   f555w n-up preview  
h_n2440_f656n_s06y_drz_sci.fits
h_n2440_f656n_s06y_drz_weight.fits
h_n2440_f656n_s06n_drz_sci.fits
h_n2440_f656n_s06n_drz_weight.fits
F656N
H-alpha
1600 s
f656n y-up preview   f656n n-up preview  
h_n2440_f658n_s06y_drz_sci.fits
h_n2440_f658n_s06y_drz_weight.fits
h_n2440_f658n_s06n_drz_sci.fits
h_n2440_f658n_s06n_drz_weight.fits
F658N
N II
1600 s
f658n y-up preview   f658n n-up preview  
h_n2440_f675w_s06y_drz_sci.fits
h_n2440_f675w_s06y_drz_weight.fits
h_n2440_f675w_s06n_drz_sci.fits
h_n2440_f675w_s06n_drz_weight.fits
F675W
R-band
120 s
f675w y-up preview   f675w n-up preview f675w n-up weight preview