KPNO IRIM Observations of the Hubble Deep Field

Ten nights of time (UT 27 April - 6 May 1996) on the KPNO Mayall 4m Telescope have been used to image the Hubble Deep Field in the near infrared. The IRIM camera employs a 256 x 256 Rockwell NICMOS-3 HgCdTe array, with a scale of approximately 0".6/pixel at the 4m f/15 Cassegrain focus. This provides a field of view approximately 2.5 arcmin on a side, well matched to that of the WFPC2.

Uncannily, the weather remained clear throughout the run. A small amount of time was lost one night due to telescope closure for smoke from the forest fires happening elsewhere in Arizona. Some cirrus was present during the first three nights, but thereafter conditions were largely photometric. Warm weather resulted in a relatively bright K-band background.

Altogether, 22.9 hours of data were collected in the K-band, along with 11.0 hours at J and 11.3 hours at H. Net image quality in the combined images produced on-line at the telescope is 1.0 arcsec FWHM.

In addition, about half the flanking field area was covered with 24 minute K-band exposures. Fields to the east and north of the central HDF were observed.

Data reduction and calibration are currently underway.

Some pictures:

Distribution plans

We plan to distribute the reduced infrared images and photometric catalogs of the HDF within four months of the completion of the observations. Watch this space and the STScI HDF Clearinghouse web page for further information.


Return to the STScI HDF home page.

Mark Dickinson: 5/13/96