README web version of /home/usg/OPS/MTS/readme_xml/readme_77081300

Principal Investigator Email Address

• Sophie.Maurogordato@obs-nice.fr

Estimated Total Execution Time (hours, including overheads)

• 9h

General Description

• This program consists in MOS spectroscopy with VIMOS in high spectral
  resolution mode (HR BLUE grism) of the galaxy cluster A2163.
  Pre-imaging has been performed in 077.A-0813(E).
  
  The planning of future observations is as follow: two sets of
  observations, each set consisting of different OBs. If possible,
  it would be preferable that OBs in a set are observed consecutively.  
  
  1) First set: Field 1 preimaged in PRE_A2163ch1 077.A-0813(E) OB 234542
  - MOS_A2163f1 + MOS_2163f1bis 
  2x (2 scientific MOS exposures of 45mn + lamp arc
  calibration) 
  - MOS-spectrophotometric1:
  spectrophotometry of G138-31 + lamp arc calibration 
  
  2) Second set: Field 2 preimaged in PRE_A2163ch2 077.A-0813(E) OB 234546
  
  - MOS_A2163f2 + MOS_A2163f2bis
  2x (2 scientific MOS exposures of 45mn + lamp arc
  calibration)
  - MOS-spectrophotometric2:
  spectrophotometry of G138-31 + lamp arc calibration.

Waiver Requests

• We have requested a waiver on the maximum execution time of the OBs from
   1h to 2h. 
  As we have multiple exposures of the same field (4x 45mn on field 1 and
  4 x 45mn on field 2),
  it is highly more efficient for us to have the whole serie done consecutively
  for each set. For each field, we  wish to split the whole observations in
  two scientific OBs of 2x 45mn each. This is the minimum which stands in itself,
   as
  a single 45mn exposure  is too short to get any scientifical result individually.
  
  For the same reason, we need to increase
  the maximum limit on the airmass, to be able to follow the same field during 
  several hours. This was already done successfully in visitor mode in
  P73.
  
  Both waivers have been granted.

Critical Observing Condition Constraints

• In order reach a good spectral resolution, we selected a slit size of
  1 arcsec, so we require a seeing <=1arcsec. Good transparency is mandatory
  (CLEAR), and if possible, PHOTOMETRIC conditions will allow to make the
  spectro-photometric calibration which is important in the program.  
  DARK nights are essential to reach faint magnitudes with a good S/N.

Time-Critical Aspects

• None.

Special Execution Requirements

• From our previous observations (May 2003) in visitor mode, we ask to refine
   the
  centering of the objects on the mask, which even if spending some time during
  the night, is really worth doing it. For that, we took a short exposure of the field
  through the mask, applyied an offset if necessary, and took another exposure foer
   check. These
  operations were repeated until the light from centering stars AND OF THE BRIGHT
   GALXAXIES was
  clearly seen through the slits.

Special Calibration Information

• 1 arc calibration and 1 spectro-photometric standard 
  for each set of 2 consecutive scientific observations. 
  Lamp arc calibrations are requested for the four quadrants with the four masks
  inserted.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

Do all your OBs comply with the instrument-specific requirements listed
 on the instrument-specific Phase 2 web page ?

• YES

If this is a pre-imaging run, did you select PRE-IMAGING for the Observing
 Category for each Observing Template ?

• N/A

Do all your finding charts comply with both the general and instrument-specific
 Phase 2 Web Pages ?

• YES

If you submitted OBs for standard stars, did you specify the magnitude
 and spectral type of all standard stars in the OBs ?

• N/A

Have you included OBs for any calibrations that you need but which are
 not part of the Calibration Plan ?

• YES

If you are observing Moving Targets, have you attached suitable ephemeris
 files to your OBs?

• N/A

If you have preferences which OBs should be executed first, did you make
 use of the User Priority field in the OBs ?

• N/A

If this is a run that requires coordinated observations with other facilities,
 did you give proper instructions in the Time-Critical Aspects Section ?

• N/A

Did you specify suitable guide stars for all your OBs using Guidecam
 ?

• YES

Did you check that the chosen guide stars are suitable for all the offset
 positions and that they do not produce unacceptable vignetting of the field of view
 ?

• YES