Science Images

CFHT has provided tapes with all the data taken for this program, including poor quality exposures. Only good exposures, (exposure judged to be useful to meet the science goals), are validated by the QSO Team. Observation Groups (OG) that contain unvalidated exposures might have been repeated. Please note that all exposures have an evaluation grade from 1 to 4 indicating our assesment of the data quality.

These data are not raw exposures. They have been detrended by Elixir to correct the dark, bias and flat-fielding in the image. We have adopted the convention that detrended object exposures will be suffixed with a 'p' indicating that they have been 'processed', instead of an 'o'.The log includes standard information such as the filename, FITS OBJECT field, FITS CMMTOBS field, the filter used, and the date of observation. The table also includes QSO and Elixir information such as the constraints on image quality, and sky brightness requested during the Phase 2 (PH2), the actual image quality and sky brightness measured by Elixir, and the evaluation grade assigned to the exposure by the QSO team.

Column NameDescription

The runid associated with this exposure. Usually this is the Runid assigned to your program, but some images (calibration, photometry and detrend) receive special Queue runids. (Q97= Standard Fields; Q98=Photometry Exposures; Q99: Detrend Frames)

FilenameThe filename of this exposure.
TypeThe type of exposure, whether OBJECT, CALIBRATION, DETREND, FOCUS, or SNAP.
Date UTC The date the exposure was taken in UTC
Time UTCThe time the exposure was taken in UTC
PI Name The last name of the Principal Investigator of this program
NameThe information extracted from the FITS OBJECT field
CommentThe information extracted from the FITS CMMTOBS field
RAThe right ascension of the telescope at the time of this exposure
DecThe declination of the telescope at the time of this exposure
Exp TimeThe time the shutter was open for this exposure
FilterThe filter wheel in position during this exposure
Req IQ The Image Quality requested by the PI for the Observation Group containing this exposure
Req Sky The sky background requested by the PI for the Observation Group containing this exposure
Req AM The worst airmass requested by the PI for the Observation Group containing this exposure
Obs IQ The actual Image Quality (in arceseconds) of this exposure as measured by Elixir
Obs SkyThe background count of this exposure measured in ADUs/pixel/sec
Obs AM The airmass at the beginning of this exposure
Phot Yes if the sky was photometric at the time of exposure.
No if it wasn't.
QSO Eval The evalution grade assigned to this exposure by the QSO Team according to the following guidelines.
  • 1 All the specifications are met within +10% of the requested values.
  • 2 All the specifications are met, but one might be off by 20% or more.
  • 3 Several specifications were not met. The science goals could by compromised. Observation to be repeated when possible.
  • 4 Specifications not met due, for instance, to a technical problem. Useless for the science program.

QSO Comment A comment, if any, about this exposure from the QSO Team
Elixir Eval The elixir eval is a 5 character string where each character represents a pass/fail state for an elixir process. Each character will assume a value of 't' true, 'f' false, or '-' no elixir evaluation performed. The first character indicates that the data exists. The second character indicates that detrend data exists. The third character is reserved for future use. The fourth character indicates that a photometric solution was found, and the fifth character indicates that at least seven chips have astrometric solutions. Most elixir evaluations look like this: tt-tt
Thumbnail A binned image of this exposure. Clicking on this will open a new browser window with a large 10x10 binned jpeg of this exposure. Image is scaled from .2sigma below the average to 2sigma above the average.
Occasionally, elixir is unable to generate jpegs.