Gemini Science Archive

Gemini Science Archive Gemini Hokupa'a System Verification Data

Gemini Hokupa'a System Verification Data

Data taken as part of instrument System Verification (SV) or for other engineering purposes (including the Demonstration Science programs) and that are deemed to be of scientific value are made public after an assessment period typically not longer than 2 months. You are encouraged to take these datasets and assess or use them yourself.

The available data packages are listed below. The table includes the instrument, data package reference name, (astronomical) target name and a brief summary of the data. A more complete description is contained within the data package itself. Click on the hyperlinks to download the raw or processed data (generally the processing was taken to a state that allowed quality assessment and therefore does not represent the best possible reduction e.g. for scientific analysis) in several formats:

  • A 'preview' version of the combined data (as jpeg or gif, if available)
  • The processed, combined data (as gzipped fits file, which should saved to disk)
  • The complete package (as gzipped tar file(s); these should be saved to disk for unpacking)

The gzipped files may be saved to disk by using "shift+click" or "right-click" plus choose "save" from your browser's menu.

Instrument Data Package Name Target Preview Data package
Hokupa'a GN-2000QS-DS-1 Galactic Center see below for CD

Demonstration science images of the Galactic Center at broadband H & K' and narrowband CO and K-continuum. See a full description of the DS data package and processing, including how to obtain the data.

Hokupa'a GN-2000QS-SV-1
(release 1)
M15 release 1 Kp preview (43Kb) release 1 Kp co-add (4.7Mb)
release 1 Science data (38.6Mb)
release 1 Calib. data (73.1Mb)

The globular cluster M15 was used to measure the variations of the point-spread function across the field. We plan to monitor Hokupa'a performance and field angle dependence by repeating similar sets of observations at the beginning of each Hokupa'a observing block.

Filters Coordinates Observing conditions Final image quality
Kp AOGS at 21:29:56.7, +12:09:46.3 (J2000) IQ: median, CC: photometric FWHM~0.12"
Hokupa'a GN-2000QS-SV-1
(release 2)
M15 release 2 Kp preview (54Kb)
release 2 Kp highres (167Kb)
release 2 Kp co-add (24.6Mb)
release 2 Science data (77Mb)
release 2 Calib. data (54.3Mb)

This is another observation of the globular M15. During this engineering observation we were testing the acquisition range of the Hokupa'a wavefront sensor. In this data set three of the four diagonal axes were explored. The field of view across a diagonal is between 30-50 arcseconds. Unfortunately no photometric standard stars were observed this night.

Note that the coadded image may not have the optimum registration of individual images.

Filters Coordinates Observing conditions Final image quality
Kp AOGS at 21:29:56.7, +12:09:46.3 (J2000) IQ: median, CC: photometric FWHM~0.12"
Hokupa'a GN-2000QS-SV-2 M32 GN-2000QS-SV-2 Kp preview (20Kb)
GN-2000QS-SV-2 H preview (20Kb)
GN-2000QS-SV-2 Kp co-add (3.6Mb)
GN-2000QS-SV-2 H co-add (3.6Mb)
GN-2000QS-SV-2 Science data (177Mb)
GN-2000QS-SV-2 Calib. data (53.7Mb)

Nearby elliptical galaxy. Used to test the use of an extended source as the AOGS.

Filters Coordinates Observing conditions Final image quality
H (480sec) and Kp (480sec) AOGS at 00:42:41.8, +40:51:52 (J2000) IQ: median, CC: photometric FWHM~0.13"
Hokupa'a GN-2000QS-SV-3 53W002 vicinity GN-2000QS-SV-3 Kp preview GN-2000QS-SV-3 Kp co-add(3.1Mb)
GN-2000QS-SV-3 Science data(29.5Mb)
GN-2000QS-SV-3 Calib. data(91.2Mb)

This data set was intended to provide an example of the detection of faint galaxies. The field consists of several faint field galaxies in the vicinity of 53W002. The calibration data for SV-3 are identical to the calibration data for SV-4. No photometric calibrations were taken on this night however by bootstrapping photometry from Demonstration Science observations of the galactic center taken the same night we estimate that the brightest three objects in the field are Kp ~ 18.5 to 19.0.

Filters Coordinates Observing conditions Final image quality
Kp (540sec) AOGS at 17:14:06.6, 50:15:59.4 (B1950) IQ: median, CC: transparency good but photometric(?) FWHM~0.15" (on-axis AO GS)
Hokupa'a GN-2000QS-SV-4 UGC5 GN-2000QS-SV-4 Kp preview (22Kb)
GN-2000QS-SV-4 H preview (10Kb)
GN-2000QS-SV-4 Kp co-add (3.3Mb)
GN-2000QS-SV-4 H co-add (3.3Mb)
GN-2000QS-SV-4 Science data (52.6Mb)
GN-2000QS-SV-4 Calib. data (91.2Mb)

This image of SN2000da and its parent galaxy UGC5 represents a fleeting opportunity to image nearby galaxies at high resolution from the ground by using bright extragalactic supernovae as AO guide stars. The supernova's visual magnitude was around 17.5, which approaches the limiting AOGS magnitude for Hokupa'a. Unfortunately no photometric standard stars were observed this night.

Filters Coordinates Observing conditions Final image quality
H (540sec) and Kp (900sec) AOGS at 00:03:06.5, -01:54:42 (J2000) IQ: median, CC: photometric(?) FWHM~0.2"