Instrument: The observations were obtained with
the University of Hawaii Adaptive Optics System (Hokupa'a) with the infrared
camera QUIRC. Hokupa'a is a 36-element curvature-sensing AO system. The
Insitute
for Astronomy, University of Hawaii, Adaptive
Optics Group has more information about the AO system. The detector
in QUIRC is a Rockwell 1024 x 1024 pixel HgCdTe "HAWAII" array sensitive
to 2.5 microns. A description
of QUIRC is available from the Insitute for Astronomy.
Pixel scale: 0.01974 arcsec per pixel (Detector
pixels)
Field of view: 19 arcsec x 12 arcsec
Information about filters, exposure time and resolution:
| Filter | Exposure time | Resolution (FWHM) |
| BrGamma (2.166 µm narrow band) | 20 times 30 seconds | 0.12 arcsec |
| K-band (2.2 µm broad band) | 8 times 30 seconds | 0.12 arcsec |
| H-band (1.635 µm broad band) | 4 times 30 seconds | 0.12 arcsec |
| J-band (1.25µm broad band) | 5 times 30 seconds | 0.24 arcsec |
Processing: The images were sky-subtracted using sky images obtained before and after the observations. Then the images in each passband were registered and co-added.
The images were deconvolved using the "correct sampling" method proposed by Magain et al. and a Lucy-Richardson iterative algorithm. This deconvolution was used exclusively to clean the images from the halo and small PSF residual artifacts. The resolution of the images have not been increased by the deconvolution process.
The color composite is made from the deconvolved images in Bracket Gamma (red), K-band (green) and H-band (blue). The J-band images is presented as a "blue-scale" image. For comparison also a "red-scale" K-band image is presented.