README web version of /home/usg/OPS/MTS/readme_xml/readme_84052900

Principal Investigator Email Address

• gilles.bergond@gmail.com

Estimated Total Execution Time (hours, including overheads)

• 6

General Description

• We aim at determining the radial velocities of globular clusters (GCs)
   around the isolated early-type galaxy NGC 821 (aka CIG 89), to study its halo dynamics
   and dark matter content. The high-multiplexity offered by FORS2/MXU is fully exploited,
   with over 100 candidate GCs targetted per mask (in addition to a few simultaneous
   stellar templates and 4"x1" sky slits defined by hand in empty areas -- PLEASE NOTE
   the latter have been removed from the finding charts for clarity). The highest resolution
   1400V+18 grism and full wv range will be used with 1" circular slits centered on
   the faint (V ~ 20 up to 24) point-like targets, using a single exposure of 2670
   s per OB. Three identical 1-hr OB per pointing (one North, the other South of the
   galaxy) thus fill up the 6 hours allocated. The "Northern" cig89 mask includes about
   15 more candidate GCs, so it should be considered as prioritary. The targets have
   been selected from deep 4.2-m WHT prime focus camera BVR images and should have
   accurate astrometry, to be checked with the >=6 reference stars of mag. V ~ 16-20
   (so a 4-s exp. in I looks fine to get central S/N ~> 20, w/o saturation) selected
   per field. An addtn'l through-slit exposure of 1 min in I is needed to see the faintest
   targets (S/N ~ 5 for V = 24) and, if possible, should be kept for further scientific
   use (getting a 4th colour for the GCs).

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• None

Time-Critical Aspects

• None

Special Execution Requirements

• All the 3 OBs for a given pointing (preferably the Northern one which
   includes more targets)
  must be acquired in order to obtain sufficient S/N spectra for the faintest targets,
   most of them having V ~ 22-24.

Special Calibration Information

• None

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• None

Source(s) of Pre-imaging

• ---(Empty)---

Pre-imaging sources not listed above

• William Herschel Telescope PFIP camera

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 ?

• N/A

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 ?

• YES

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

If you have prepared your finding charts with tools other than FIMS,
 do they comply with the specifications on the FORS1 Phase 2 web page ?

• N/A